How does a heat pump work?

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HEAT PUMPS

Friedrich TwinTemp® YS09L10 Thru-Wall/Window Air Conditioner

Thru-Wall/Window, 9200 BTU/hr, 12 EER, 3 Fan Speeds, Reusable Filter

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$890 - $1205

Sunpentown WA-9040DH Portable Air Conditioner

Portable, 9000 BTU/hr, 9.21 EER, With Remote Control, Reusable Filter

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$388 - $589

LG PTAC LP090HED Thru-Wall/Window Air Conditioner

Thru-Wall/Window, 9100 BTU/hr, 11.7 EER, 2 Fan Speeds

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$550 - $619