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Another year has gone by with me procrastinating about adding AC/heat to the man cave. I have a three car detached garage, a single bay sectioned off from the other two it measures 12 ' x 26 ' with a slanted 2/12 pitch roof. The roof is only 2 x 4 construction but I plan on scabbing in another 2 " of wood to give me the ability to add R19 insulation to it. The walls are R13 with wood siding outside and wood sheet inside. The two bay is 24 ' x 26 ' with a more conventional pitched roof. The walls are also R13 with wood siding and wood sheet inside. Ceiling is not finished but I plan to finish it and add about R40-R50 in the ceiling. So that is the baseline for adding heat/AC. Being in Georgia taking the edge off with heat is all I'm looking for as it doesn't get that cold here, generally the coldest we see is 30 degrees. But the summer can be quite warm and humid so that is the bigger concern. So I have about 940 s.f. between the bays in total . My electric box in the garage has four open slots so I think I'm OK for expansion.
For security reasons I don't like the idea of window AC units. And for stand alone heat I could have the home natural gas line extended out to the garage and run two ceiling mounted heaters. But the more research I do I'm thinking one mini-split with capability to run two zones is the way to go. Would a 18,000 BTU unit do both sides ? In the winter I would set the unit as low as it would go maybe 45 and in the summer leave it at 80. Then adjust when I want to work in the garage. I am not doing woodworking so no sawdust just general car maint. and working on the boat. So will a mini-split live in this environment ? I am finally going to pull the trigger this year and I have started email chat with a local HVAC company but Pelicans tend to be smart and honest Sorry for the long post.