Abstract: A monitoring security system can be coupled to a thermostatic HVAC control module, either wired or wirelessly. In at least some embodiments, the thermostatic module can be communicated with via an interactive interface of the security system. Information as to the operation of the security system and the module can be presented on a common display of the security system, and commands, which are directed to the module, can be entered via the security system.

Abstract: A power control unit and method of use thereof for varying the supply of electricity to an electrical apparatus using a wireless communications link between a controller and the power control unit. The power control unit is adapted to alternatively communicate with the controller using a non-peer-to-peer communications standard or a peer-to-peer communications standard such as Wi-Fi Direct.

Abstract: The present invention is an interactive control device that combines both functions of lighting and temperature control in one device. The interactive control device includes a thermometer and has power connections compatible to the line voltage wiring (typically 110-120 VAC) so that it may be connected to the electrical wiring in the same manner as a standard light switch. The interactive control device may also include sensors and/or cameras, or the ability to communicate with external sensors and/or cameras. The interactive control device is further capable of wirelessly communicating with remote devices, such as smart phones and tablets, appliances, alarm systems, sound systems, and locks.

Abstract: In an implementation, a method for managing airflow provisioning in an area comprising a plurality of racks, wherein a plurality of fluid moving devices are to supply airflow to the plurality of racks through a plurality of adjustable vent tiles, includes accessing a model that describes airflow transport and distribution within the area, said model comprising a plurality of parameters, determining values for the plurality of parameters, and implementing the model to partition the area into a plurality of fluid moving device zones of influence with a desired level of overlapping among the plurality of fluid moving device zones of influence.

Abstract: In a building which has at least two floors, an apparatus for controlling and regulating room temperature having a hierarchical structure includes a predictive device on the top level, that provides optimal control of the use of at least one free energy source, and at least one device on a lower level which is used for feedback regulation of at least one additional energy source. The predictive device uses a building model and repeatedly optimizes the energy requirement or the energy costs. The regulation strategy of the predictive device uses characteristics of a passive heat accumulator of the building.

Abstract: A method includes determining a pressure difference across a scroll compressor of a cooling system. The pressure difference is compared to a minimum differential pressure value. Pressure differences across the scroll compressor that are less than the minimum differential pressure value are associated with unloading the scroll compressor. Parameters including a pressure set point value and an absolute minimum pressure value are increased when the pressure difference is less than the minimum differential pressure value. Subsequent to the increasing of the parameters, the parameters are decreased when the pressure difference is greater than a sum of the minimum differential pressure value and a hysteresis value.

Abstract: The current application is directed to intelligent controllers that continuously, periodically, or intermittently monitor progress towards one or more control goals under one or more constraints in order to achieve control that satisfies potentially conflicting goals. An intelligent controller may alter aspects of control, dynamically, while the control is being carried out, in order to ensure that goals are obtained and a balance is achieved between potentially conflicting goals. The intelligent controller uses various types of information to determine an initial control strategy as well as to dynamically adjust the control strategy as the control is being carried out.

Abstract: A cogeneration system comprising a power generation unit, a thermal generation unit thermally coupled to the power generation unit, a plurality of renewable energy conversion units, and a power distribution unit configured to receive and distribute power from the power generation unit, thermal generation unit and the renewable energy conversion unit where the power distribution unit reduces the amount of power produced by the power generator based on the amount of power provided by the renewable energy conversion units.

Abstract: A method of auxiliary heater pump control in a vehicle including a heater core and an auxiliary pump in a heater core branch of a vehicle coolant system is disclosed. The method comprises the steps of: determining if a power plant is on, the power plant being connected to the coolant system; calculating an estimated heating power required to meet HVAC system heating requirements that is a function of mass air flow, specific heat, and a change in temperature in a passenger compartment; determining if the calculated estimated heating power required is greater than a minimum required heating power that will be able to maintain thermal comfort in the passenger compartment of the vehicle; and if the calculated estimated heating power required is greater than the minimum required heating power and the power plant is not on, activating the auxiliary pump to pump a coolant through the heater core.

Abstract: In a method for supplying a resource to an entity from a resource actuator, a plurality of physics-based models pertaining to the resource actuator and the entity are developed, a condition detected at the entity is received, feedback control on a resource demand of the entity employed based upon the detected condition, feed forward control on the resource demand of the entity is employed based upon the detected condition and the plurality of physics-based models, a constraint optimization problem having an objective function and at least one constraint using the plurality of physics-based models is formulated, a solution to the constraint optimization problem is determined, in which the solution provides the actuator setting, and the resource actuator is set to the actuator setting to supply the entity with the resource from the resource actuator.

Abstract: The invention relates to an improved climate control system in which a climate controlling equipment (1) has a control line (2) arranged to be connected to climate influenced impedance means (3). According to the invention, relay means (4) are arranged to disconnect the climate influenced impedance means from the control line under influence from an output (5) of a control unit (6) and to instead connect substituting means (7) providing an impedance controlled by a second output (8) of the control unit. The latter is connected to a processor (9) arranged to receive information from a plurality of climate influenced information means (10, 11, 12) and to process the same in a mathematical model for controlling the impedance of the substituting means via the control unit.

Abstract: A medium having stored therein a program, the program causing a computer to execute a process, the process comprising: selecting a vibration medium corresponding to first vibration data, on the basis of matching between the first vibration data and the reference vibration data, the first vibration data corresponding to first vibration transmitted via the vibration medium and detected; selecting reference vibration data corresponding to second vibration data, from among the reference vibration data stored in the reference data storage unit on the basis of the second vibration data and a correction value of the reference vibration data, the second vibration data corresponding to second vibration transmitted via the selected vibration medium and detected; updating a correction value of the selected reference vibration data on the basis of the second vibration data; and generating a control signal for controlling the apparatus on the basis of the selected reference vibration data.

Abstract: A facility for performing setpoint adjustment-based duty cycling techniques by adjusting the setpoint of a device or component is described. The facility reduces energy consumption for a system, such as an HVAC system, or device by adjusting or modulating an associated setpoint or temperature setting. The facility modulates the setpoint between a base setpoint value and another setpoint value based on a mode of the system. When the system is in a cooling mode, the facility modulates the temperature between the base setpoint value and a higher setpoint value. When the system is in heating mode, the facility modulates the temperature between the base setpoint value and a lower setpoint value. The facility may modulate the setpoint between the two setpoint values based on an offset value or a fixed setpoint value.

Abstract: Thermostatic HVAC and other energy management controls that are connected to a computer network. For instance, remotely managed load switches incorporating thermostatic controllers inform an energy management system, to provide enhanced efficiency, and to verify demand response with plug-in air conditioners and heaters. At least one load control device at a first location comprises a temperature sensor and a microprocessor. The load control device is configured to connect or disconnect electrical power to the an attached air conditioner or heater, and the microprocessor is configured to communicate over a network. In addition, the load control device is physically separate from an air conditioner or heater but located inside the space conditioned by the air conditioner or heater.

Abstract: A constant-flow control valve and BTU meter assembly that has a pressure independent, constant-flow control valve assembly connectable to the fluid-based heating or cooling system. A valve stem is connected to a valve member and is rotatable as a unit relative to a valve body to change the position of valve member to change a fluid flow rate through the valve. The valve member's position relative to the fluid path is directly related to the fluid flow rate. A BTU meter assembly is connected to the valve stem, which is rotatable relative to the BTU meter assembly. A position sensor of the BTU meter assembly detects a rotational position of the valve stem relative to the BTU body. A controller of the BTU meter assembly determines the fluid flow rate based upon the pressure drop across the valve assembly and the rotational position of the valve stem.

Abstract: An outdoor air temperature information acquisition section acquires the outdoor air temperature, a room temperature information acquisition section that acquires room temperature, an air conditioner state information acquisition section that acquires information on the state of heat exchange type air conditioners and the outdoor air cooler, an estimated value calculating section for room temperature during outdoor air cooling calculating the estimated value for room temperature after switching to the complete outdoor air cooling mode that stops the heat exchange type air conditioner and carries out room temperature control by only increasing or decreasing the effect of the outdoor air cooler from the cooling mode mainly using the heat exchange type air conditioner.

Abstract: The invention relates to a method for operating and/or monitoring an HVAC system (10), in which a medium circulating in a primary circuit (26) flows through at least one energy consumer (11, 12, 13), the medium entering with a volume flow (?) through a supply line (14) into the energy consumer (11, 12, 13) at a supply temperature (Tv) and leaving the energy consumer (11, 12, 13) at a return temperature (TR) via a return line (15), and transferring heat or cooling energy to the energy consumer (11, 12, 13) in an energy flow (E). A considerable improvement in the operating behavior of the system is achieved by empirically determining the dependence of the energy flow (E) and/or the temperature difference (?T) between supply temperature (Tv) and return temperature (TR) on the volume flow (?) for the energy consumers (11, 12, 13) in a first step, and by operating and/or monitoring the HVAC system (10) according to the determined dependency or dependencies in a second step.

Abstract: Modeling the behavior of an enclosure for use by a control system of an HVAC system is described. A model for the enclosure that describes the enclosure's behavior for use by the control system is updated based on weather forecast data. The weather forecast data can include predictions more than 24 hours in the future, and can include predictions on temperature, humidity and/or dew point, solar output, precipitation. The model for the enclosure can also be updated based on additional information and data. The model for the enclosure can be updated based also on an enclosure model stored in a database, and/or enclosure information from a user. The model can be updated based on active testing of the enclosure which can be performed automatically or in response to user input. The testing can include heating and/or cooling the enclosure at times when the enclosure is not likely occupied.

Abstract: A self-contained wireless HVAC vent which can be independently controlled via a wireless communication link. The HVAC vent is capable of regulating the airflow in to a zone by using adjustable damper(s). The control settings of the HVAC can be configured in conjunction with an application and user interface (UI) via an external device. The HVAC vent also monitors the condition of the air, which may include temperature, air quality and humidity, as well as the presence of potential hazardous conditions. Lastly, the power needed to operate the HVAC vent is acquired from the environmental surrounding and converted and regulated to electrical energy.

Abstract: A cooling management system including component racks, a cooling system, pressure measurement devices, and a computing system within a structure. Each component rack includes an exothermic apparatus. The structure includes warm air aisle spaces and cold air aisle spaces located between the component racks. The cooling system feeds cold air into each cold air aisle space. The cold air flows through the component racks resulting in displacement of warm air from each exothermic apparatus. The warm air flows into the warm air aisle spaces and is directed back to the cooling system. The pressure measurement devices measure differential pressure values between the cold air aisle spaces and the warm air aisle spaces. The computing system monitors the differential pressure values, perform calculations associated with the differential pressure values, and control a fan speed of at least one fan within the cooling system based on the calculations.

Abstract: The disclosure provides an HVAC data processing and communication network. In various embodiments of systems and methods including a bus, a compressor is coupled to the bus, and a subnet controller is coupled to the bus. The subnet controller disables the compressor when acting upon a dehumidification command.

Abstract: An HVAC controller may be programmed to initiate a delta T test in response to a request received from a user. The user may initiate the delta T test at the HVAC controller or via a remote device. In some cases, the HVAC controller may be configured to automatically execute a delta T test for each valid equipment stage combination of the HVAC system without receiving further input from the user and to determine both a run time and a stabilized delta T parameter value for each equipment stage combination. The HVAC controller may also record the delta T parameter value and run time for each test in the memory of the HVAC controller. The HVAC controller may be further configured to notify the user when testing for each/all equipment stage combination is complete.

Abstract: Disclosed herein is a building energy management apparatus and method. The building energy management apparatus includes a Building Information Model (BIM) analysis unit for receiving and parsing BIM data and then analyzing BIM objects. A building energy object extraction unit extracts building energy objects related to building energy from the BIM objects. A building energy object database (DB) stores a building energy object data into a DB by arranging the building energy objects. A building energy management unit manages energy of a building based on the building energy object data. Accordingly, the present invention provides technology for extracting and managing objects of a building related to the energy of the building based on a BIM, thus efficiently managing building energy.

Abstract: One aspect is an HVAC grid controller that may communicate with local HVAC controllers, wherein the local HVAC controllers control the operation of local HVAC components including an integral electrical storage unit. Thus, the HVAC grid may sends appropriate control signals to local HVAC controllers to, for example, draw power from an electrical storage unit to operate local HVAC components. The local HVAC controller may also be additionally programmable by a user to select a period of time in which the HVAC unit is to be powered by a local electrical storage unit. By using an electrical storage unit to power HVAC components, a utility power provider may better manage load on its electrical grid, and a consumer may avoid peak time-of-use electricity charges.

Abstract: A multi-type air conditioning apparatus including an outdoor unit, indoor units, and a communication line, each of the outdoor unit and the indoor units including a communicator transmitting/receiving data through the communication line and a controller transmitting at least one preamble signal, including priority information to transmit the data using the communication line, through the communication line, and transmitting the data through the communication line when transmission of the at least one preamble signal has been completed. In the multi-type air conditioning apparatus, each of the outdoor unit and the indoor units selects a priority set time, transmits a preamble signal after the selected priority set time has elapsed, and delays data transmission when a preamble signal transmitted by another constituent unit is sensed during the priority set time, thus avoiding collision on the communication line and rapidly occupying the communication line.

Abstract: A method for detecting and responding to disturbances in a HVAC system using a noisy measurement signal and a signal filter is provided. The method includes detecting a deviation in the noisy measurement signal, resetting the filter in response to a detected deviation exceeding a noise threshold, filtering the noisy measurement signal using the signal filter to determine an estimated state value, and determining that a disturbance has occurred in response to the estimated state value crossing a disturbance threshold. In some embodiments, the method further includes performing one or more control actions in response to the detection of a disturbance.

Abstract: An appliance for conditioning air of a room comprises one or more power consuming features/functions including a temperature controlling element for one of heating and cooling air. A controller is operatively connected to the one or more power consuming features/functions. The controller is configured to receive and process a signal indicative of a utility state. The controller operates the appliance in one of a plurality of operating modes, including at least a normal operating mode and an energy savings mode in response to the received signal. The controller is configured to at least one of selectively adjust and deactivate at least one of the one or more power consuming features/functions to reduce power consumption of the appliance in the energy savings mode.

Abstract: In particular embodiments, an energy gateway is described that is configured to receive power usage information from one or more power meters, transmit the power usage information to an energy management server, receive control signals from the energy management server, transmit the control signals to the one or more power switches and execute localized pre-programmed rules.

Abstract: A HVAC system that employs atmospheric data, a controller for an HVAC system and a graphical user interface that receives atmospheric data are provided is disclosed. In one embodiment the HVAC system includes: (1) an interface that receives atmospheric data for an installed location of the HVAC system and (2) a controller that configures the HVAC system based on the atmospheric data.

Abstract: A low energy environmental sensor is provided herein that is configured to receive user inputs from movement of the sensor itself. A method of operating a rocking environmental sensor is also provided. In one embodiment, the rocking environmental sensor includes: (1) a base having a fulcrum point and (2) a face including a first movement initiator area and a second movement initiator area configured to cause the face to toggle with respect to the fulcrum point and complete a signaling path indicating a user input.

Abstract: A control unit (22) for an HVAC system (10) comprises an economizer (EC), which economizer (EC) is configured to introduce outdoor air (OA) into the HVAC system (10) for cooling and/or ventilation purposes in a manner controlled by said control unit (22), said control unit (22) comprising a base module (23) with: a control circuit (24), a man machine interface (25) connected to said control circuit (24), and first I/O means for connecting at least one sensor (32, . . . , 36) of said HVAC system to said control circuit (24) and for delivering at least one control signal from said control circuit (24) to control the operation of said economizer (EC). Said base module (23) is configured to optionally receive at least one extension module (26, 27, 28), which can be snapped on and electrically connected to said base module (23) for expanding the functionality of said control unit (22).

Abstract: A device for communicating information from a controller for a rooftop air handling unit to a portable electronic device includes a wire terminal for wiring to the controller and for receiving a signal including information from the controller. The device further includes a transceiver configured to form a direct wireless communications link between the transceiver and portable electronic device. The device yet further includes a circuit coupled to the wire terminal and the transceiver. The circuit is configured to extract the information from the signal. The circuit is further configured to format the information into a format in which the information can be presented to a user by the portable electronic device and to provide the translated information from the transceiver to the portable electronic device.

Abstract: Disclosed herein are representative embodiments of methods, apparatus, and systems for distributing a resource (such as electricity) using a resource allocation system. In one exemplary embodiment, a plurality of requests for electricity are received from a plurality of end-use consumers. The requests indicate a requested quantity of electricity and a consumer-requested index value indicative of a maximum price a respective end-use consumer will pay for the requested quantity of electricity. A plurality of offers for supplying electricity are received from a plurality of resource suppliers. The offers indicate an offered quantity of electricity and a supplier-requested index value indicative of a minimum price for which a respective supplier will produce the offered quantity of electricity. A dispatched index value is computed at which electricity is to be supplied based at least in part on the consumer-requested index values and the supplier-requested index values.

Abstract: An HVAC system is provided for use in a vehicle having a passenger compartment volume. The HVAC system includes a HVAC housing having a duct opening formed in an exterior sidewall thereof. An evaporator is further provided for exhausting air downstream that is cooler than the air on the upstream side. An auxiliary compartment, such as a storage bin, is spaced apart from the HVAC housing, such as in a remote location of the passenger compartment. An auxiliary duct fluidly interconnects the HVAC housing and the auxiliary compartment via the duct opening for transmitting the cool exhausted air to the auxiliary compartment to provide a cooling effect within the auxiliary location. The auxiliary duct, in some embodiments, is disposed external from the HVAC housing for improved service and retrofitting to existing HVAC systems.

Abstract: The disclosure provides a method of starting a heating, ventilation and air conditioning (HVAC) system, a method of manufacturing a HVAC system, a HVAC system, and an integrated controller thereof. In one embodiment, the method of starting includes: (1) receiving an initiation signal at a main system controller of the HVAC system, (2) determining if main controller application information associated with the main system controller is stored thereon, (3) querying an auxiliary controller of the HVAC system when determining the main controller application information is not stored on the main system controller, (4) sending the main controller application information to the main system controller from the auxiliary controller when the auxiliary controller includes the main controller application information and (5) initiating the HVAC system based on the initiation signal and employing the main controller application information sent to the main system controller from the auxiliary controller.

Abstract: The disclosure provides an HVAC data processing and communication network and a method of manufacturing the same. In an embodiment, the HVAC data processing and communication network includes at least one environmental sensor, at least one subnet and a subnet controller. The subnet controller is configured to discover the at least one environmental sensor, the at least one subnet and at least one damper controller. The subnet controller is further configured to set up the network for zoned operation in the event that at least two of the at least one environmental sensor are discovered.

Abstract: Disclosed herein is a heating apparatus for a domestic or commercial building. The apparatus comprises a controller for determining whether there is a need for heating in the building and a computer system for installation in the building. The computer system includes a data store, a program store storing processor implementable instructions, and at least one processor coupled to the data and program stores for implementing the stored instructions to thereby produce thermal energy. The apparatus also comprises a thermal energy distribution means arranged for transferring the thermal energy from the computer system to at least one other location in the building, to a thermal energy storage means and/or to an industrial process. The apparatus is arranged to operate the computer system to implement processor implementable instructions, to thereby produce thermal energy, in response to the determination of a need for heating in the building.

Abstract: A thermostat includes a plurality of HVAC (heating, ventilation, and air conditioning) wire connectors for receiving a plurality of HVAC control wires corresponding to an HVAC system. The thermostat also includes a thermostat processing and control circuit configured to at least partially control the operation of the HVAC system and a powering circuit coupled to the HVAC wire connectors and configured to provide an electrical load power to the thermostat processing and control circuit. The powering circuit has a power extraction circuit configured to extract electrical power from one or more of the plurality of received HVAC control wires up to a first level of electrical power, a rechargeable battery, and a power control circuit. The power control circuit is configured to provide the electrical load power using power from the power extraction circuit and the rechargeable battery.

Abstract: A controller for a building management system includes a system of rules for detecting faults in the building management system. The rules include content conditions and trigger conditions. The content conditions are not checked until one or more of the trigger conditions are met. A rule-based fault detection engine may be implemented by a low level building equipment controller. One or more thresholds for a rule may be automatically or manually adjusted.

Abstract: An air conditioner includes an indoor unit and a remote controller connected to the indoor unit through two lines to receive power from the indoor unit and perform communication with the indoor unit. The indoor unit includes a first modulation switching element to modulate power according to a communication signal that is transmitted to the remote controller, a first demodulation switching element that is driven according to a communication signal transmitted from the remote controller, and a first distribution resistor to demodulate the communication signal transmitted from the remote controller. The remote controller includes a second modulation switching element to modulate power according to a communication signal that is transmitted to the indoor unit, a second demodulation switching element that is driven according to modulated power transmitted from the indoor unit, and a second distribution resistor to demodulate modulated power transmitted from the indoor unit to obtain a communication signal.

Abstract: A combined business and technical method is described in which a paid subscription service is offered to provide “premium” HVAC algorithms for a network-connected, multi-sensing learning thermostat. The users who have chosen to pay for the premium subscription service are provided with at least one additional feature, capability, and/or option that is not provided to unpaid “basic” subscribers of a cloud-based thermostat servicing system that is provided for all thermostat owners. According to some embodiments, an on-line interview process is administered to gather additional information for improving the settings of the thermostat. According to some embodiments, an active test is performed to determine thermal characteristics of the structure. According some embodiments, the user guaranteed to at least recoup the cost of the premium service through energy cost savings.

Abstract: An HVAC controller is configured to transmit a service request to a service provider over a network. In some cases, the service request may contain information that is indicative of the performance of the HVAC system. Upon receiving the service request, the service provider may send an acknowledgement that the request has been received. The acknowledgement may be delivered to as an email or text message to a user's remote device or, in some cases, may be displayed on the user interface of the HVAC controller.

Abstract: In an air conditioning system and a communication method thereof a wireless network may be established between indoor units and a controller or between outdoor units so as to allow communications therebetween, thereby facilitating device addition or device deletion. Also, one or more outdoor units and a plurality of indoor units may be controlled without a dedicated communication line or with using a less mount of the dedicated communication line, and the outdoor units or indoor units may perform communications using one or more communication technologies, such as wireless communication and pipe communication technologies and wireless communication and dedicated line communication technologies, while performing communications with the controller using the wireless communication technology.

Abstract: A system and a method for controlling and monitoring a system within a facility are disclosed. The system includes a facility component configured to include at least one control point configured to be disposed within a facility and to monitor and control at least one element of the system within the facility; a network component configured to be communicatively coupled to the facility component and configured to process information received from the at least one control point; a remote client component configured to be communicatively coupled to the network component and configured to provide monitoring and control of the facility via the network component and the facility component. The remote client component is configured to receive processed data from the network component and generate instructions to the control point via the network component.

Abstract: A heated air makeup unit comprising a heating chamber with a modulated furnace one or more non-modulated furnaces air temperature control and efficient furnace operation over a wide heating rate range. The utilization of indirect fired furnaces in the heated air makeup unit is disclosed. A control system is included to provide control of heated air temperature to within +/?1 F.° using continuous control of the heating rate of the modulated furnace and stepwise activation and de-activation of the non-modulated furnaces in response to heating demand. A programmed combustion air flow controller programmed to provide optimal airflow for any gas flow in a flow range of a modulating gas valve is provided to assure combustion efficiencies of at least 83%.

Abstract: Apparatuses and methods for use in connection with a Building Automation System (BAS) are disclosed herein. In one embodiment, the present invention comprises an intelligent power node comprising a JAVA-enabled device and serial communication cable that provide a seamless open protocol and aggregation point to broadcast internet protocol communications. In another embodiment, the present invention enables energy monitoring and control of individual ports and outlets. In yet another embodiment, the present invention is a method of configuring and operating fieldbus devices.

Abstract: An HVAC controller is configured to log one more user interactions into a user interaction log stored in its memory such that at least some of the user interactions may be recalled from the user interaction log and displayed on the user interface of the HVAC controller in response to a request by a user. The user may use the information contained in the user interaction log as an aid in troubleshooting an HVAC system.

Abstract: A method for managing the power consumption of an information handling system including a processor and an associated cooling system. The method may include providing power to the cooling system based on a performance/power balance setting, accepting a user input to adjust the performance/power balance setting, and adjusting the power provided to the cooling system based on the adjusted performance/power balance setting. The performance/power balance setting may define a balance between performance of the processor and power consumption of the associated cooling system.

Abstract: An air conditioner and a controlling method thereof are provided. The controlling method may include determining an initial operation temperature based on a received external input or setting, cooling or heating a room at the determined initial operation temperature for a preset initial operation time period, and thereafter increasing or decreasing the room temperature at a preset time interval.

Abstract: UV-C light assembly is designed to kill germs (bacteria, molds, protozoa, virus, and yeast) in the forced airstreams of HVAC systems, thus preventing the spreading of germs into other rooms or spaces. An air-flow activated switch is invented for turning on the UV-C lights when airstreams pass through and turning off when airstreams stop in the HVAC systems. The UV-C light assembly is installed inside duct through air filter's opening. The UV-C germicidal assembly is an easy add-on to an existing HVAC system for indoor air purification. The UV-C light sources are either LEDs or fluorescent tubes.