That's a great starter shop, but I think you may have undersized the AC for having that size shop in Texas. Insulate it extremely well, Weatherstrip the doors too, and you may be marginally fine. Also, try to find a good quality pleated furnace filter that will completely cover the coil and fit under the plastic face of the AC. I have a 23,000 btu heat pump window style unit mounted high through the North wall of my 14 X 26 insulated shop, and it begins to loose ground when the temps outside go above 92 degrees. This past week the afternoon outside temperatures reached 96 almost every day and the inside temps climbed from the 72 setting to 78 degrees with the unit running 24/7.
A 12 X 20 pleated furnace filter just fits inside the cover of my unit and completely covers the coil. It lets the unit double as a whole shop air filter. I use this filter instead of the original foam filter because the original filter didn't stop the sawdust very well. If sawdust gets in the coil, the unit's efficiency drops rapidly, and it's a bear to clean out. Use a good quality furnace type pleated air filter and clean or replace it often, even if you have to tape the filter on the outside of the plastic cover. You want to filter the air going into the unit. There is no need to filter the air exiting. Aim the exit fins up slightly as cold air settles.
A 60 amp 240 volt electric service is adequate for a shop that size. It will let you run the AC, a large air compressor, even electric heat, table saw, and even electric heat and all the lights and bench 129 volt outlets that you could possibly need. You can actually have more total amps of all of the circuit breakers for a total of more than 60 amps, because all of the circuits will not be drawing their full rated current at any given time.
I put a four outlet quad box every 4 feet along the bench walls of my shop and wished that I had added more. There are 2 - 20 amp outlet circuits and the boxes alternate between the circuits, so I could fully load two adjacent boxes and not have an overload.
My ceiling lights and outside lights are connected to these two circuits as well, but about half of them are on each circuit. This keeps me from being totally in the dark if I should trip one of the breakers. I also have a couple of outlets on the ceiling. My table saw as well as my dust collector, the heat pump, and my Unisaw are all 240 volts and each are on their own 2 pole breakers. When working as just one man in my shop I have never tripped a breaker, and frequently have the AC, dust collector, compressor, and Unisaw all running at the same time. The starting current may be as high or higher than the circuit breaker rating, but the actual running current will be much less, so the total amps will be much less than the panel rating.
I think you are going to out grow that shop in a few years if you stay with woodworking. If you believe me, then you should get a larger electric panel for it now. It will not cost much more now to go with a 100 amp panel now, but the wire and panel will need replacing, if you go with 60 now and then decide that it isn't big enough and want 100 amp panel in a couple of years. My panel is 100 amps, so I can add onto my shop if I decide to, but it will be a tight fit to comply with the zoning laws.. I'm a licensed electrical contractor and installed it myself. I built and then wired my own shop by myself.
My shop has a small refrigerator and running water with a sink for hand washing and glue cleanups, It also has an outside faucet to wash the cars and trucks, but it has no toilet and I regret this very much. If I ever build another shop, it's going to have a toilet, even if it's just a urinal hidden somehow in the corner. The shop will be at least a 3 car garage in size too. (I'm dreaming).
Good luck and have fun in your new shop. I would plywood the inside walls, sheet rock the ceiling, and paint them white, but do whatever seems right to you and your budget and then enjoy making things.
Charley
