
1268 Heat pump principles

1269 Heat pump evaporator coil - grabbing heat from the outside air

1270 Heat pump condenser coil - giving off warm air to the inside

1271 Heat pump schematic - summer mode

1272 Co-efficient of performance (COP & balance point) | 1273 Balance point

1274 All-electric heat pump system

1275 Water source heat pump - open loop system (well-based)

1276 Ground source heat pump - horizontal closed loop |