I couldn't believe my eyes! :o Heaters! The temperature in my greenhouse during the day is hotter than my oven can get!!!! :o :o However, nothing like planning ahead. I bubble wrap my greenhouse for added insulation, and I save polystyrene to use around the bottom (nothing worse than a cold bottom!). I used to use parrafin heaters, but as I am in, out, in, out, in, out with kid/family things, I would forget to turn it on/off and the greenhouse would get very damp inside and all of my cuttings would get hairy and die! Now, my darling Ava has installed leccy, so I have a thermostatically controlled fan heater which goes in during January and comes out again at the start of April. This does me fine, and I can forget about it totally!