ac btu recomendations

Hey guys,

its been awhile since Ive been back and was wondering what is the recommended amount of cooling btu on say 1000 MH in 8" cool tubes with the ballast and exhaust out of the room.

I know as a general rule it takes approximately 4000btu of cooling with the light in an enclosed space with a digital ballast in the room remove the ballast and it drops around 3500BTU's but exhaust most of the heat build up around the bulb and what do you need to keep the temps down.

thank you

"Hello" right back at you.

I've never concentrated on BTU's. It's too complicated. I bought the smallest AC unit, on sale, at Circuit City and installed it. My garden room is 6x8x10. It's MORE than enough to cool the room.

Instead of getting all mathematical look at it practically. The bigger the room, the less heating problem you're going to have. The opposite is also true.

Buy the cheapest model on the market, bring it home, install it and test. If it's not cooling enough, return the AC and buy a bigger one.

I'm all about saving money...for myself and for anyone. Unless you have a huge room, a small window a/c should be more than enough.

I hope this helps!

Merry Christmas.....

Hello,

Thank you for response, however this will be my fourth grow room setup in the past I have always used open reflectors and window ac units using a rough estimate of 4000 btu per 1000w of light and adding a cushion for other heat variables and exterior environment of the grow room and not wanting to drive the ac so hard all the time for example my last room was a 10 x 24 room sealed with co2 injection and 4 1000w on rails running 24hrs (mother room) using 4000 btus I would need a minimum of 16000, however the walls were not insulated and the exterior heat would reach around 110F in the summer so I went with a 25000 btu unit to compensate and not have the ac compressor constantly on, my new setup will have the same amount of lights with the exception of being air cooled in 8" cool tubes, I will still be using the 25000 btu old unit but want to install a back up unit to cover the minimum requirements of 6000watts should the older unit fail. so if the btu's needed to cover this is 2000 per light then I know as a back up a 12000 unit will work if the number is lower I will still use a 12000 unit but if it is higher say 3000 then I want a 18000 unit to further protect my moms until the larger ac unit can be replaced. I have considered using a temperature kill switch and fans but with summer temps getting over a 100 and certain genetics being very sensitive to drastic light changes a back up would be preferred. so if anyone has the recommended formula please chime in.

best regards

anyone know this????

I'm all about saving money...for myself and for anyone. Unless you have a huge room, a small window a/c should be more than enough.

I hope this helps!

Merry Christmas.....[/QUOTE]

Right back at you mate. co2 works out around the same as ac.. buts you actually get more for your money with co2 (icebox). However ac is simple a child could deal with it.