well if you rig it right because heat rises you can build a thing that won't let light out but just the heat

good idea mate, but i think a small blow heater would be better?
iam just a little worried with a blow heater to much dry air maybe?

well with the way I was saying it you can adjust the temp a little easer

passking, i have the same problem growing in the eve of my house, the roof side gets COLD! right now i am veging 24/0 so it doesnt matter, cuz the lights keep it warm, but when i go to flowering, i am thinking of getting a space/blow heater, and what you do for dry air, is put a open glass of water either in front or behind (not sure which would work yet) the heater, and the evaporating water will keep it from being to dry!
Best of luck mate

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yes get a heater with a thermostat and a proper thermometer and have the fan running all the time...that should do you pretty good. I believe a good rule of thumb would to not have the temp drop more than 5-10 degrees an hour and no more than 30 total...you definitely don't want the temp going from 75 F to 30 F or something....unless you know your grow and think its okay.

Good Luck!

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thanks guys great help,
iam gona go with this 1 for larger grow area that is just 12 on 12 off lights,
Dimplex "DCU18LCD" 1.8kw ceramic oscillating upright fan heater - Kays
and for 24 hour light room gota find a smaller heater, as the bulbs dont get hot enough to warm the small area up.