Abstract: An AC/Heater attachment systems has various types of devices to attach a filter system to a ducting port. A magnetic U shaped device has a raised lip for placement of a filter therein; the device is made from naturally magnetic material or is coated with a magnetic paint. Diamond clip type attachment devices are attachable to a filter in slots precut into a filter. Further, a slidable second associated device cooperates with the first to effect a variable one dimensional size. A 3D logo can be affixed along a surface of one of the devices taught herein. A double sided tape can be attached along a surface of the filter attachment device in lieu of a magnetic attachment mechanism. A collapsible and adjustable devices are also envisioned with protrusion and hinge actuation devices.