Auto a/c compressors are rather small in capacity, due to the small relative volume inside a vehicle. They are built as a "revolver" pistol... many small pistons inside the shell working in tandem. If you can source cheap salvaged compressors and have a free source of mechanical energy (water wheel, windmill,etc.), it would be a cheap way to cool your home. As for heating, I know it will work in theory, but haven't seen much info on the subject. Good luck.
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