In a heat pump, it takes in heat to warm your home. In an air conditioner, it dissipates heat from the refrigerant, changing the refrigerant from vapor to liquid to cool your home.

A method of dividing a home into different comfort zones so each zone can be independently controlled depending on use and need; an air conditioning system capable of maintaining varying conditions fo [..]

A method of dividing a home into different comfort zones so each zone can be independently controlled depending on use and need; an air conditioning system capable of maintaining varying conditions fo [..]

The force that pushes electrical current along wires and cables.

The unit of electrical power equal to the flow of one amp at a potential difference of one volt.

A thermometer whose bulb is covered with a piece of water-soaked cloth. The lowering of temperature that results from the evaporation of water around the bulb indicates the air’s relative humidity.

The unit of measure used to describe a difference in electrical potential, abbreviated by the symbol “v.”

The factor representing resistance to heat flow of various building materials.

Underwriters Laboratories

A furnace in which air is drawn in through the sides or bottom and discharged out the top.