Help is at hand
... I run a selection of 250, 400, and 600 watt Hps in my stealth cab
.. I get away with running the 250 and 400 by both drawing air in and venting it out in the same room, and have an osilating fan in the room my grow-cabs in, I also leave a few windows on the latch..
However whilst running the 600 temps climb insanely high very quickly, so I came up with the idea, of both using the 600 during the Winter months only and running the 600 setup from 7pm onwards (at night - To make use of the cold temps, and cheaper rates of Electric) I also fed 6" Ducting through my ceiling into my roof... But I did not choose to expel my hot air(exhaust) up there, (Leaving a big steamy heat signature), it made more sense to pull cold air in from the roof and expel into my house.. I turn all the heating off and allow my 600 to do its work... I get lovely plants and my house stays plenty warm..Killing two birds with one stone, and theoretically I cut out my Winter central heating bill
... AC is another option I am currently looking into, as well as RES. Coolers, Anyhow hope that jelps a bit dude
- STELTHY