If you do not understand how A/C works read "Air Conditioning" first.

Cooling Mode

A heat pump is essentially an air conditioner with a few additions. A heat pump has a reversing valve, two metering devices and two bypass valves. This allows the unit to provide both A/C and Heat. The diagram above shows a HP (heat pump) in cool mode. The cycle goes like this;
Heating Mode

The diagram above shows the heat pump in heat mode. The difference in the two diagrams is the reversing valve (2) directs the compressed refrigerant to the inside coil first. This makes the inside coil the condenser and releases the heat energy (3-4). This heated air is ducted to the home. The outside coil is used to collect the heat energy (3-7). This now becomes the evaporator.

Both heating and A/C modes do exactly the same thing. They PUMP HEAT from one location to another. In these examples the heat in the air is moved out of or into the home.

Have you changed your filter lately?



About D&H Climate Control

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