A temperature control device mounted on the wall to send signals to turn the system on and off to maintain a comfortable temperature. Programmable thermostats provide more control settings to operate [..]

Seasonal Energy Efficiency Ratio. A measure of an air conditioner's cooling efficiency. The higher the SEER, the more efficient the product. The government's established minimum SEER rating [..]

Abbreviations for heating, ventilation and air conditioning, the three main functions of an indoor home comfort system. HSPF:

An air conditioner that contains a valve that allows it to alternate between heating and cooling. Heat Source:

A network of refrigerant-filled tubes where heat leaves the hot refrigerant vapor. The vapor then condenses into a liquid capable of absorbing more heat. Evaporator Coil:

The pump that moves the refrigerant from the indoor evaporator coil to the outdoor condensing unit and back to the evaporator. The compressor functions as the heart of the system, because it circulate [..]

The piece of equipment in the central air conditioning or heat pump system that moves heated or cooled air throughout a home's ductwork. In some systems a furnace handles this function. BTU:

 

Annual Fuel Utilization Efficiency. A measure of a furnace's heating efficiency. The higher the AFUE, the more efficient the product. The government's established minimum AFUE rating for fur [..]