Check your reversing valve, When you set your thermostat for heat the reversing valve circulates the heated freon through the air handler instead of the cooled freon. The valve is called many things but it reverses the flow of freon See http://www.google.com/images?hl=&q=heat+pump+schematic&rlz=1B3GGGL_enUS329US330&um=1&ie=UTF-8&source=univ&ei=npcOTfLEPMO88ga4poDGBQ&sa=X&oi=image_result_group&ct=title&resnum=2&ved=0CC4QsAQwAQ&biw=1024&bih=576 and look at the different schematics
You can replace the heat/ac unit with a newer one, but the savings are small as the evaporator/condenser or air handler will not off set the expense of the mechanic having to adapt the new unit to the old air handler. The problem may be in the air handler as a leak of the freon may be all that is wrong.
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