Insulation is the key. I used the silver bubble stuff (Radient barrier) between the 2x4 studs, then put the R13 over that. Then drywall. But if I lived in a colder place, I would nail 2x2 to the studs and lay in the radiant barrier and at least R30 insulation between studs. For the shop ceiling I have the radiant barrier, R38, plus a layer of 2 inch insulating foam between the 2x8 beams, then drywall.
The radiant barrier is about R4 or so, but it's real value is it reflects heat back the direction it comes from. When we put this up in the garage, we compared the roof temp for barrier and bare areas and there was about a 40 degree difference (Desert in summer).
I don't lose heat that way. The complication is with dust collection. Without a really good filter, you can't keep the DC in your shop. It dows put out a certain amount of very fine dust--the really nasty part. But if you vent the DC to the outside, you are pumping out your heated or AC air.
I have two sheds in my back yard, one is a small office, the other is my shop. There is about a 42 inch space between them. So I enclosed and roofed over the space, put the DC inside (see pix), and opened a vent hole with a 20x20 fine filter. This allows the cleaned air to return to the shop. We get cold enough in winter and hot enough in summer so this really helps.
I use electric heater and a through the wall AC unit. I have an RC remote so I can turn on the heat an hour or so before I get in the shop. Then I turn on a second heater to push the temp up a little more. Once it hits a comfortable temp, I turn the second one off. I also found a temperature controlled switch used for green houses that turns heat on and off, but moved it into the office instead so my computers and server never get below 55 degrees.
The pix shows the electrical, Super Dust Deputy, through the wall connector and hose, the HF DC unit with Wynn 1 micron filter, and behind that, the 20x20 fine filter that returns air back into the shop. The chamber is well sealed, but I haven't insulated the ceiling and ends yet. The walls are already insulated.
This was a lot of work, but the payoff is that I can work with a vest and short sleeves in winter, or Tshirt in summer. Sorry the pix is sideways, but maybe a mod can fix it. I hate using my cell phone for pix like this, but lost my real camera awhile ago.
Last edited by DesertRatTom; 11-09-2019 at 03:10 AM.
Reason: Trying to turn pix.