An air-to-air heat pump takes heat from the air outdoors to heat the air indoors. On hot days it can even cool the house. Cooling capacity is enough for the living room, kitchen and bedroom.
The user does not tolerate extreme temperatures. In summer he benefits greatly from the cooling unit. It is difficult to get the municipality to pay for the heat pump since temperature intolerance is not a visible disability.
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This tip is from 2005