Really not enough info to give a good answer yet... was it cooling your home good before you switched to heat? If it wasn't, then most likely your system is low on refrigerant... when it is suppose to be on, check to see that your outdoor unit is coming on, if it is on and the outside unit looks like a block of ice or starting to ice over, the defrost control board has failed and needs replaced.. hope that helps
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If nothing is working, place your thermostat to emergency heat and your gas furnace or electric air handler heat strips should energize
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