The windows are on the second floor?
There really is no need to keep them open... Are you doing that so that people wont be suspicious? What if it rains.... ?
There are windows on the 2nd floor bedroom and 3rd floor (master bedroom). I was going to vent the 3rd floor (4,000 watts) out the window.

Where else could I put all that heat? Into the attic which also happens to be on the same level? It wouldn't have anywhere to go from there and would just backup. If you think otherwise then please explain, as I'm extremely open to suggestions.

Spray foam is a good idea. Can spray foam be cleaned up quickly if need be? I suppose it's going to at least leave a residue on the wall isn' it?

if you set your room up properly with three thousand watts, hydro, co2, and moderate your temp. you'll easily get 2.5lbs per light. three thousand wattts is much easier to control than four thousand watts. you can figure about ten degrees extra heat above ambient temperature for each thousand watts of light.
redneck & Knowm,
I hadn't planned on using C02. Seeing as how this isn't going to be a sealed grow. Not that I wouldn't mind doing a sealed grow, I just think it would be far too hot.

I never planned on this being the most efficient grow. I think there are some real impressive and efficient grows on here, but I was going for overall yield. My general idea was that if I add another 1k, and it heats the room up, sure i may get less per watt, but overall as long as I get more weed.

I'm definately open to suggestions as far as not venting out the window and making my grow more efficient because, if I can save space, then I'll use that space to grow something else that doesn't need light or take up electricity. :dance:


Thanks for calling me "safe" and not "paranoid." I don't think anything should be considered paranoid for a grower over here.