Eddie, first question is do you have room in you electrical panel to add another circuit breaker?

I can run all of my studio stuff on two 15 amp circuits.

In my garage I have A electronics workbench that could run off 20 amps but I have a 15 amp and a 20 amp circuit because I have a portable AC on wheels. It just failed yesterday and I replaced it with a new one 8500 BTU. It cost $500.

With the building you are talking about a window unit would be the best option. That needs to be on it's 20 amp circuit. You can also plug the two heaters into that outlet in the winter.

The size of the AC depends on the insolation in the walls, floor and roof.

So...There is no issue with coming off existing breakers IF the circuit in the house is not being used at the same time as the new building. That arrangement most likely will not pass electrical code.

Best case scenario is to install two new 20 amp breakers in you panel if you have the space. Breakers are cheap enough and all the other wire to the building will be the same.

You do not want you studio equipment running on the same circuit as the AC/Heat do to voltage spikes and noise in general.

If the ground is not too hard I would advise driving a additional ground rod into the ground next to the new building.

I would also run CAT 5 or whatever in the same trench. Keep the router/switch in the house. Fiber would actually be better but that gets pretty pricy with the conversion boxes from CAT to fiber.

You can always use wireless but for me with a one gig fiber connection to the internet I don't use wireless much except for my cell phone.

The skylights will add to the AC needs. Spray insolation is pretty pricy. Foam in 4X8 sheets is a good option. Actually none of the insolation works very well. I had six inch walls in my studio in Arizona with six inch insolation and you could hear the drums a quarter mile away.

I finally put sound attenuation blanket in one room of the studio. Not cheap!

PM me if you want my phone number and I will answer all your questions.

Billy

“Amazing! I’ll be working with Jaco Pastorius, Charlie Parker, Art Tatum, and Buddy Rich, and you’re telling me it’s not that great of a gig?
“Well…” Saint Peter, hesitated, “God’s got this girlfriend who thinks she can sing…”