So I can just offer some thoughts....

I have a tuck under garage, and it has a 220v heater hanging. The garage gets coold in the winter and hot/humid in the summer. I could not keep games in there all the time as summer would probably wreck havoc. The electric heater (220) sucks power like no freaking other. I left it on low for 1 month and the heat bill was 100-150ish easily.

My plan is to build a detached garage and maybe have games there as well....but again need full year round temp control. With all that being said, I would probably say the mini split (they even have diy versions) would offer AC in the summer, dehumidifier and some heat. I don't know if they are okay to run in the dead of winter, but a few years ago I was told the heat versions were good for fall/spring to supplement heat. Another effective way to heat is a gas heater, could even do a propane pig tank.

I have radiant heat in my house and have been planning a mini split for a bit. The common brand is mitsubishi. I have no idea on reliability of other brands.

But this got me thinking of getting one of the wall hangers for the garage as well.....

Someone I know just self installed those, he said he had to get a few special tools but the install was big money so he saved a lot.

I think in the meantime of doing a split I’m going to install a gas IR heater

I get charging some extra incase the install goes wrong but they should of checked it out for the quote. Ya 2k seems like a lot…