havin said all that usually our weather picks up this month weather rain r sun its still very warm toward the mid 2 end off the month and early sept, first 2 weeks, so its really aft that period im gonna have big probs. its a shed cinderblokes, corrugated iron roof and the window is boarded ovr with 1inch plyboard. so theres no insulation and the size is @ least 10 feet long 6 foot high and 6 wide, iv sectioned off my grow area down 2 1 1/2 meter long.with no insulation ill need 2 look at other ideas a convection heater?.