Abstract: A method for operating a temperature control system for a structure is disclosed. The method includes monitoring historical data, and controlling the temperature control system to inject outdoor air into the supply duct of the temperature control system based upon historical data. Some embodiments of the system include monitoring an interior and exterior temperature of a structure, defining a first time range and a second time range, associating one or more operating parameters of the temperature control system with the first time range and the second time range, monitoring operational time and operational load of the cooling system for the first time range, and controlling a ventilation subsystem during the second time range based upon the monitored operational time and operational load of the cooling subsystem for the first time range, and the one or more operating parameters of the cooling subsystem associated with the second time range.

Abstract: A method and system for supplying fresh outdoor air into a building structure is disclosed. The method includes monitoring indoor and outdoor temperatures and selectively injecting fresh outside air into a supply line based upon the monitoring. Embodiments include injecting the fresh air using an injection duct within the supply line downstream of a forced air device.