I use a side draft cooler in my workshop in the Mojave. 107 here yesterday and the cooler only drops temps by 20-25 degrees, so it is still warm inside. I have partially insulated the shed, especially the ceiling, which helps a little, but I think full insulation would really make the difference I also lined the shed walls first with aluminum coated bubble wrap before putting in the block foam insulation I used. Do the insulating BEFORE you put up shelves and cabinets, it is a massive chore to go back to insulate later. I had water just outside the workshop (shed) so it was easy to run 1/4 inch copper line to the cooler. Be sure to get a flaring tool for the copper fittings or they can easily break loose and spill a lot of expensive water before you notice. Every exterior faucet has cut off valves at the base, same with the cooler source. Amazing how often these puppies break. Find a store where you can get schedule 80 pipe for any runs above ground--all it takes is one freezing night to have your pipes burst. I also used a threaded T at the lowest point in the 1/4 inch run. Water goes straight through from source, into the T, with a 1/4 fitting on the other side. The third outlet has a threaded stopper that lets me drain the system before winter. Finally, I also have a fan that directs some of the cool air to the far reaches of the shop, which is where I have my workbench.