I think you are asking how to add heat and A/C to a garage?
Rather than add ducting from existing house HVAC, I opted for a separate unit allowing for the garage to be a separately controlled zone. I added a PTAC (packaged terminal air conditioning) unit to my ~500 sq ft garage - this is a unit like those used in hotel rooms, tyically mounted under a window. Mine is made by GE, is heat pump and A/C, has separate thermostat, automatically comes on a 40 and 80 degrees to protect from freezing/overheating, etc. Mounted high in a side wall - make an opening frame much like a window, install the metal sleeve for the unit in the opening, slide the unit into the metal sleeve, connect power, and enjoy the comfort.
You could also go with a mini-split unit. Like the PTAC but rather than all-in-one, a separate air handler hung on the inside and compressor unit outside.
My portable is Amcor PLM16000E I'm thinking of putting a insulated duct to distribute the air in the center of the garage. Also replace the exhaust
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