What to do for shed Heating and Air Conditioning

My condo came with a backyard shed that I decided to make my workout space, then it needed a bit of work though.

I had to add insulation, drywall and new windows, but even with that, I worried about temperature control, thankfully I live down south and it does not get too cold. I found that a easy space heating system does the job quite well. I just need to turn it on about an fifth before working out and after that I have quality heating. I knew I was going to be in trouble when Summer hit, and now it is Summer and not having any A/C is honestly rough. I have looked into window A/C although I don’t love the idea; Where would I store the air conditioners when it was no longer hot? I also don’t appreciate covering my new windows with an ugly, bulky cooling unit. I have looked into a ductless mini cut and that is what I want. I would have both heating and cooling in 1 single unit. The air handler mounts on the wall and out of the way. I could get a smart temperature control and run it from my PC. I could preheat or cool the space and do it from my work computer. I could have as much heating or air conditioning as I want! However, the cost on this and the replacement is quite extensive. I don’t suppose if it is worth doing for an fifth a afternoon interest. I honestly only need an A/C option too for the Summer season. I am running out of openings though.

Heating and air conditioning system