Are you saying you're thinking about putting the evaporator portion of a ASHP in a garage, mud room, or greenhouse?
Okay, but understand that an ASHP is going to pump lots of heat out of whatever structure you put the evaporator in. I doubt you can keep a greenhouse or mud room warmer than ambient under conditions like that. In fact, read up on the amount of soil you need thermal contact with per kW of GSHP. I don't think your greenhouse field loop is going to be any cheaper than a buried field loop.
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