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That really depends on what you are trying to heat and how you are heating it.
In a car the heat usually comes from engine "waste heat". You just need to be running the engine. The compressor is part of the air conditioner, which is used for cooling not heating.
If your low side (evaporator coil) pressure is higher than your high side (condenser coil) while the compressor is running, your switching valve is in the reversed position. That is, you are in the heating mode of the heat-pump, and the pressures are reversed to provide heat into the home.
Heating vents should be placed on or near the floor because heat rises. In rising, it will warm the air of the room. If the heating vent were near the ceiling, the room would stay chilly, even though heat was being poured into it.
During an emergency. i.e. when the heat pump is not working. If your heat pump can not keep your house warm, then the auxiliary heating coils (same thing as emergency heat) will come on automatically. If not, then there is a problem with your heating system.
Heating vents should be located near the floor since hot air rises. If the heating vents are located near the ceiling the heat would stay there and not warm the room.
If there's no heat coming out, it isn't working properly. If you mean it's running, but not producing warm air, there are various reasons, but the heating coil may be out.
Heating vents should be placed near or on the floor in a room because heat travels up not down.
The energy source is the same as for heating anything. Gas,Electricity, Burning any fossil fuel. in a boiler (furnace) with water running in heat exchanging coils or manifolds. When heat is needed a pump circulates the hot water through the radiators and back to the furness.
It would be better to place the heating vent near the floor because the heat will travel up and down, so that way the room would be heated evenly. If you place it near the ceiling, the heat would not heat the floor that well, since the heating vent sucks back in the heat
Yes, we use it. Sounds as though you should buy a heating engineers handbook.
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