Is your thermostat perhaps programmed with a circulation option. Many modern thermostats have this option. check your fan options. They may be On,Auto,Circ. If it has a Circ or Circulation option, your indoor fan will still periodically turn on according to ASHRAE standards, even if your stat is turned off. if you poke the fan button you should be able to choose auto and this will solve your problem. Hope this helps.
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