These are all in one units, some of them are made like smaller central units and some of these are separate ac and heat units. the heat in the separate ones is run off of a heat strip in the unit it's self the ones that are made like a central unit reverse the flow of the freon in the system to draw the heat from outside. this is not something you can repair very easily yourself. most places require because of the freon that you have a certified HVAC technician to work on them.
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These are all in one units, some of them are made like smaller central units and some of these are separate ac and heat units. the heat in the separate ones is run off of a heat strip in the unit it's self the ones that are made like a central unit reverse the flow of the freon in the system to draw the heat from outside. this is not something you can repair very easily yourself. most places require because of the freon that you have a certified HVAC technician to work on them.