the last drafty shop i had was a converted greenhouse. with f/g roof panels to cover the holes. overlaped plywood on the dirt floor. jersey winters don,t drop below 0 very often, but wind blows and it is wet more than dry. i used a salvaged hot air oil furnice, pulled the intake air from outside and sort of presurized the place. the thermostate was a toggle switch. but they were fun times.
