Your furnace uses more energy in making heat than your air conditioner uses when removing heat. This explains why your heating bill is usually higher than your cooling costs.

Air conditioning, often the most recognized part of HVAC systems, cools indoor air during warmer periods. It works by removing heat and humidity from inside the building and releasing it outside, using a system of coils filled with a refrigerant.

Heating or cooling through conduction typically takes place at the building envelope (the outside walls, windows and doors) where warm or cold air outside causes the molecules of the envelope to increase vibration or decrease vibration which in turn causes a heat loss or gain inside of the building.