hi ya doodles, see ya shout 4 help on eckys tread,i grow in a small ghouse i built meself,it only measures 4ft wide 5ft high. ive insulated 2 sides and the back with 50mm celotex, i use a black heavy duty breathable canvas so i have control over lighting but i can only grow from april to end of oct like this.u can get ghouse heaters if u need to, but some of them heaters dry the air out so u best to ventilate,i have 2x4" vents opp each other 4 venting. prob not been much help 2 u, but i wish u the best of luck on ur grow,let us no how u get on