Need HELP with Homebox (4'x8') tent

[samba]

I'm thinking of getting one for just 1 run in the winter. But I have some problems deciding what to get.What I thinking of now is:

1 x homebox XXL
http://www.homebox.net/dhtml/product_family_homebox_xxl.php

2 x 1000w hps

2 x cooltube (150mm/6")

1 x prima klima fan with 2 settings, 800/420cmph thats 470/247cfpm
http://pflanzburg.de/store/product_info.php?cPath=7_22&products_id=2940

1 x carbonscrubber (850cmph/500cfpm)

1 x dripfeed tabble (100cm*200cm/3,3'*6,6')

1 x Dripfeed set
http://pflanzburg.de/store/product_info.php?cPath=18&products_id=1173

18 (3*6) x pots (25cm*25cm/10"*10")@(11L/2.9gallons) with hydroton

It would be a recycling drip feed set up, as the room does not have pluming.
It will be taking air from out side @ temps from 5C to -20C (41F to -4F).
I'm worried about my night time temps. If we have a stormy night it might blow cool air up the intake into my tent.The intake from outside will be 125mm/5' with a old carbon-scrubber as well, exhaust will be 150mm/6'.
One solution a was thinking of was getting a thermostat controlled fan blowing out in the intake duct and a back-pressure stopper on the exhaust, but that would be a extra 200€/300$ on top of everything (about 1500€2250$), grow stuff is EXPENSIVE over here! One 1kW is 300$ and we cant even get shit like super sun 2 here, its sad...

Any advise and comment are very welcome!

 

[samba]

No one?

 

[Bush Grower]

I'd say get rid of the cool tubes, and get a batwing reflector. That way your light will serve two purposes (light to grow with, and much needed heat because your intake will be so cold). Everything looks good, you'll just have to tune your ventillation to get the temperatures you need. But ditching the cooltubes will def. help the temp problem.

 

[PharmaCan]

Why not have your intake and exhaust from/to the room your tent is in and run your lights at night? Or you could put a speed controller on your fan and slow the air flow down enough that you're keeping some of the heat in the tent.

PC

 

[samba]

I'd say get rid of the cool tubes, and get a batwing reflector. That way your light will serve two purposes (light to grow with, and much needed heat because your intake will be so cold). Everything looks good, you'll just have to tune your ventillation to get the temperatures you need. But ditching the cooltubes will def. help the temp problem.

I was actually afraid that the fan I have would just be big enough to cool 2*1kW in tubes as i have really cool intake air. Batwings are expensive here (all most 200$, cooltubes 75$) and Pico gave them a thumbs down in his test.
What I'm worried about is the night time ( lights of ) temps

My fan will have 2 settings, 800/420cmph thats 470/247cfpm
If it gets to cold on lower setting, i can always restrict the intake from outside, it will just suck air from the room it self

Why not have your intake and exhaust from/to the room your tent is in and run your lights at night? Or you could put a speed controller on your fan and slow the air flow down enough that you're keeping some of the heat in the tent.

PC

I was thinking that I'd have the fans OFF at night (lights off), but I'm afraid the temps will go to low. I did think about having the venting in to the room, but as its my living room the day temps when I'm in the room would be uncomfortably low. And if venting to the room, i don't think my fan would be big enough.

I'm hoping to keep the temps at about 25C (77F) with my super-cool intake air.

My fan will have 2 settings, 800/420cmph thats 470/247cfpm

 

[PharmaCan]

What I'm saying is forget about sucking in outside air. Just suck air from your living room and blow the heated air back into the living room, thereby heating the living room. If it doesn't heat the living room enough, use your furnace to supplement. If you have your lights on during the real night (when it's dark outside), this would heat your living room during the coldest part of the 24 hour day.

PC

 

[samba]

What I'm saying is forget about sucking in outside air. Just suck air from your living room and blow the heated air back into the living room, thereby heating the living room. If it doesn't heat the living room enough, use your furnace to supplement. If you have your lights on during the real night (when it's dark outside), this would heat your living room during the coldest part of the 24 hour day.

PC

I live in an apartment thats centraly heated. I'm running into problems with a 600W blowing in to the living roon from a other room, thats allready to hot.

 

[PharmaCan]

I live in an apartment thats centraly heated. I'm running into problems with a 600W blowing in to the living roon from a other room, thats allready to hot.

I think I would disconnect the duct from the intake that leads to outside air. Then you will have cool air coming into your living room. If your tent intake is not directly across from the fresh air vent, it will suck fresh, cold air into your living room and suck some of the hot air from the other room out. With an oscillating fan in the living room, you should be able to keep the cool and hot air mixed up enough that the room stays comfortable and your tent stays at a nice constant temp.

Well, if nothing else I'll bump your thread and maybe someone else will chime in with other ideas.

PC