the area i plan to grow in is a celler,brick walls and stone floor,
i have boxed myself a room up using plasterboard or drywall, with a carpet on the floor,
my problem is as follows,
its cold,
when i light up the 600wat hps, it soon warms up, so when i move the plants over to this area its only gona be right temp 12 hours out of 24?
what sort of heaters do u guys use? if any?
and do u keep fans running 24/7 ?
thanks 4 reading guys/gals

i have the same problem with growing outdoors i cant tell you much, but how cold does it get with the lights off? my plants would get into the low 40's high 30's (degrees) i let them be and they are doing fine.

marijuana plants can survive low temps just make sure that its not at freezing level like 15, 20's but im in cali and the weather now is a beauty

the thermometers lowest reading is 20 degrees,
and that is what is lit up when i just had a look,
the thermometer iam using at the moment is a designed for a fish tank a sticky strip type, i just stuck it on the mylar made roof, i i hope that is not true temp, and just the temp of the mylar,
i was thinking to buy a little blow heater? but would that just dry the air to much?
please help guys wanna get growing soon as possable.

20C (close to 70F is pretty close to a perfect temp for growing and that's what i keep my room at for best growing speed

space heaters are good to use but 1000w lamp produces enough heat and maybe even cheaper to use. kerosene heaters let out toxic fumes and for blow heaters i would not aim directly at plants but can be used. ive never used a heater during flowering so ill bring it up to put it into consideration for other members to help u

also 42w CFL lights will give off some heat, I have experinced it my self got my room temp to 20C and in about 4 hourse it got to 25C

i cant have any lights on thow its gona be 12 on 12 off its the 12 off iam afraid about. 12 off at night gonna get cold.

best of luck buddy just one more thing if u can let me know how it comes out, while running a heater during the dark period

if you can try running a 42w CFL but have it blocked off so that no light gets to your plants but warms the air around them

yea no problem

if its blocked off no light wold escape like u said, but also no air would also?