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[...why couldn't it run "backwards"? my house is set up to run the AC in either direction, run it one way, and the hot compressed freon goes outside the house, and the cold expanded freon comes inside the house. this makes the house cold.

flip it around in the winter time...hot compressed freon comes inside the house, cold expanded freon goes outside the house, and heats the house up.

the car system wouldn't work the same way?




Your home HVAC system is called a heat pump.
All principles of thrmodynamics are the same in boh cases but the plumbing is completely different.