A 2 ton mini split should be adequate for a 2 car plus golf cart garage. You will need to insulate attic and garage door if not already done. Consider the SEER rating of the unit to keep the operating costs as reasonable as possible. Mitsubishi units have a good reputation and have a good warranty. Expect installed cost around $5,000. Get 3 or 4 quotes, installed prices can vary a lot. Make sure installer takes care of the required permit.
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