My 22x36x10 with opening of 10x20x22 for a carlift is getting heat soon. I put too much thought into the whole scheme from waste oil to propane to wood to electric. I finally decided that I was going with NG. The garage is attached to the house through a foyer of sorts so NG was readily available. After looking at numerous products and postings I settled on a Goodman 45k GMH95. I'm getting it at near cost from a friend in the business ($900 vs $1400 retail) which will also hold the warranty intact. The garage will be kept at a cozy 50 degrees when I'm not out there which will accommodate the condensation of said unit. It also allows for a horizonal install (7'9" head clearance) up at the ceiling with a PVC intake/exhaust system through the exterior side wall. I will need to build the plenum to hold the A coil for a/c and extend it to include the duct work down the length of the garage. I've been building this garage for over a year using only a couple of friends as time and money allows. To date I probably have about $40k in a 1300 sqft structure (phase one). That amounts to about $32@sqft. Not bad so far. Having heat and a/c in the humid midatlantic coastal region (25 to 100 degrees typical swing) is imperative.