Hello The outside temp was about 50 degrees. It used to take about an hour before the insulation and reflectix foil. I am taping the seams and covering the studs with foil tape. The walls now have R23 Roxul plus R4 foil for R27 total R value. The ceiling slopes from 9 inches deep to 7 inches deep so it varies from R42 down to R34 with the R4 foil. The small knee wall shelf covering the 12" thick R1 cement foundation wall has 2" thick rigid foam board under the composite wood top shelf and plywood side wall. The heater is a 48,000 BTU Harman advance wood pellet burner. I put the reflectix foil in my 2x4 shed walls over the R15 fiberglass batts and under the paneling. It is the coolest shed around in the summer time. No real need for air conditioning.