I flower in a 12 x 8 outdoor shed, and right now it's 31 degrees f. (outdoors, lol) I use a small heater to heat the shed...and since heat rises...I use a fan near the roof that blows the warm/hot air directly down on the ladies. Shed stay's closed during the night with no ventilation, but I still provide plenty of circulation.

Keeping the pots off of the cold floors is a must, also. Setting them on a blanket, plywood or milk crate helps keep the roots from getting too cold.

Try to keep the highest/lowest temps within 20 degrees or so. Don't let the high temps get to the 80's if the cold temps get down to 50's. The wider the temperature spread, the more it stress them out.

Any lower than 50ish and virtually all growth stops. (or at least get's painfully slow)
Rusty Trichome Reviewed by Rusty Trichome on . COLD stress This time of year, many indoor grow areas in basements and such should be having some issues with keeping the temperature above 50 degrees. I know in my garden it is a real issue, and usually this time of year I get some stress showing up. Not much I can do about it unless I could heat the whole basement, but cannot. I am thinking if I go down from a 750 cfm fan to maybe in the range of 350 cfm in the winter my temps will stay warmer? Anyone got any info or opinions related to reduction Rating: 5