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No, the heat pump will also cool the home.
Heat pump. (electricity)
A heat pump is often used in air conditioning units and refrigerators because a heat pump is used to transfer heat from one place to another. Often heat pumps are used to remove heat from a building
Yes, not a problem.
Window units are used to heat specific areas of the home. If you want to heat your whole house a heat pump is the better choice.
I would recommend this site here http://www.ehow.com/how_2125874_install-heat-pump.html. It will give an easy step by step directions to install your heat pump.
On a thermostat, "EM heating" stands for emergency heating. It heats your house up very quickly, and is costly to run. This is suppose to be used if you've lost heat from your heat pump or if you've turned your thermostat way down and need to heat up your house quickly.
A 4 ton heat pump should be fine, depends on how well your house is insulated. If the house is well insulated you might be fine with a smaller unit.
The most used type of heat pump is the air-source heat pump, which transfers heat between your house and the outside air using conduction. If you heat with electricity, a heat pump can trim the amount of electricity you use for heating by as much as 30% to 40%, even 50%.
The refrigerant condenses inside coils from a vapor to a liquid. Then it releases heat to warm up the house.
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.
The thermostat turns on the heat pump and indoor fan. If an electrical sub circuit to or within the heat pump fails or locks out the heat pump, the outdoor part will not turn on.