Temps for grow room - 50°F - 80°F is ok? 67-72 is hard

Grow Room: 12'x16' Room
Light: 1000W HPS/MH swapable bulbs
Intake: Box fan in window
Outtake: 400CFM through cool tube out attic

My room is setup but when I went in this morning I was at 59°F so I think probably hit 50°F last night. I can turn the intake off at night I think my plants could get to just under 80°F. Who's growing in this temps and does it really make airy buds? How much do I need to really tighten the temps up?

Seems like some people are growing in this temp extreme. I would love to hear someone who does it all the time and his plants are thriving.

How does nature stay within 5 degrees? Even in the tropics that seems extreme to achieve.

I have found that above 85 is too hot to for them, during flowering but during veg no problems just need more water. nature temp are all over THE place so some times i give them warm days, cool days mist during the light hours sometimes. remember your playing ma nature so switch it up sometimes . Not during flowering. Airy buds are from light getting in somehow or the plants nature use fox farm cha ching and open sezme for thicker dense buds it works....

So I am talking to my wife and she suggests I use the space heater we have with the built in thermostat at night and cycle the fans with the lights. She doesn't even grow house plants and she out thought me. I didn't know we had a space heater with a built in thermostat.

temps that low can stunt growth big time, although anything under 60F will turn your foliage purple during flower, you can pick up a base board heater from home depot or lowes for $50 and it has a digital thermstat to maintain temps, very powerful though, 1000watts

I worked it out with light distance I am like 65-75 now which is pretty dang good. It is hovering between 68-72 most of the time! Plus I am at like 10" so it is perfect.

I will only use the space heater during lights out which will be at 6:30PM or whenever dark is until 12:30PM at night. I need an 18/6 timer, bought a 12/12 by mistake. Gotta get lights out if I am going to grow roots, 24/7 I don't believe in.

This icon is funny I have to throw it in, it has nothing to do with my post at all.
kiss-ass

In my research I am finding I will settle for nothing less then the best. I am going to achieve 67-72 all of the time. I did do a lot of research and yeah plants live in 50-80 but it effects the ability to take up nutes and lets face it, I want something very nice not backup stuff.

i thought you where able to adjust timers? i bought 1 from lowes for like $3.00 set it to any hours i would like.

Yeah but if I can use timers on fans now in another month I am going to be in big trouble. The room is mostly sealed now so using the central heat in my plan isn't going to work. I want my whole room evenly at 69° I don't like the extreme between my planter and the ambient either.

You don't want your lights out temps to fall below sixty degrees. Once they start getting into the fifties your plants growth will be slowed. This is only my third grow and first using hid lighting. I'm by far no expert but I spent much time on here reading before I ever grew or posted for that matter. I have also bought a few books one of which is the indoor grow bible by Jorge Cervantes, I suggest it to everyone who grows indoors. My girls just finished their second week of flowering and I'm lowering my night-time temps to sixty eight. My lights on temps range between seventy four and seventy six. I have been able to control everything this grow. It's my first in my new grow room and it is by far my best. None of my previous grows even come close to how these girls look so early on in flowering. Being able to control your environment, I'm learning, is key to producing nice healthy, happy girls. At the beginning of this grow I was hoping for two ounces from each girl, now I'm hoping for three.

What are you using to measure temp by the way?