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Could be a faulty thermostat, (referring to the furnace\heater. As far as the A.C., you must have a dual thermostat with a switch for A.C. and Heating. Is the thermostat digital or mercury bulb? As for the A.C. it sounds like it is going off on high discharge pressure. Is the cooling fan running that cools the condenser? It must be spinning freely or it may be starting and because it is partially seized, it will cut off with a high current draw. Anyways, the condenser must be clear of any debris, no shrubs around it. The compressor could be bad and trying to start but goes off on overload because it isn't starting. It's start capacitor could be bad and not giving it that extra boost on start up which is what a start capacitor does. Good luck.