Opinion please on these heat problem

Ive just recently moved house and now ive had to put plants under the house where theres not much fresh air and is quite hot.Previously air-con room with hot air venting out window.I work night shift so im home most of the time and i open up tent to let the hot air out but my problem is for about 4 hrs the tent is shut whilst im at work.Im hoping one of these will do the trick as seen in photo,dont have many shops around my area and places that have them are charging around $200.
Only need to drop temp by a few degrees,its about 29/30 when tent shut.Thank you

Are you extracting the air at the moment??
Because I doesn't sound like you are.

Yes an air cooled hood will help remove the heat from the grow space, but only if your taking it right out and not drawing it back in or Recirculating the air

Pretty sure you can get an air cooled hood on amazon for less than 100$
You'll need an inline fan as well which costs about 200 for anything decent. Don't cheap out on this part you will regret it.
Canfan
Vortex
Ac infinity
I'd stick with those, in that order

Yeah, you need general passive airflow, to bring in fresh air and move stale air out.

Your tent won't be air tight 100% so you need to ensure theres a general allowance of fresh air in the space it it is situated.

EDIT.. a light in a tube will help with excess heat a bit, but you also want some passive fresh air going through the tent for Co2, so there are a few factors here that are hampering you.

EDIT 2.. putting the light in tube wont help you with air flow around the plants. they need fresh air in and stale air out.

Jjgrow420 said:

Pretty sure you can get an air cooled hood on amazon for less than 100$
You'll need an inline fan as well which costs about 200 for anything decent. Don't cheap out on this part you will regret it.
Canfan
Vortex
Ac infinity
I'd stick with those, in that order

Click to expand...

The Vortex VTX is a beast. The cheap green Active Air ones are actually pretty decent too. Both still work good with higher static pressure.

The Vortex S-Line can't handle the static pressure as well. I wish more manufacturers listed the output at different static pressures like Vortex does.

When I ran a hid, we wouldnt draw air from the grow though the light, rather have fresh cool air drawn through usually a diff cooler room past the bulb and out(side). Then used a seperate fan and can to control the odour. Found it better than running the humid air past the bulb and components. There's no need for odour control on the bulb system because it's not drawing air from the grow. It also keeps the bulb cooler because it's not sucking up hot humid air.

PadawanWarrior said:

The Vortex VTX is a beast. The cheap green Active Air ones are actually pretty decent too. Both still work good with higher static pressure.

The Vortex S-Line can't handle the static pressure as well. I wish more manufacturers listed the output at different static pressures like Vortex does.

Click to expand...

I was strictly a can fan man until the company got bought out, then I scrambled to find something at the same level which I found to be vortex for fans and filters and Kootenay filters (same guys from canfan just quit and started their own shop).

it may be obvious, maybe not, but hot air rises, so any air drawn from the room, should be at ground leval, that way you get cool air being drawn in. probably doesent matter in a space that size anyhow, but just thaught to mention it.
if you can only afford a single fan, place it in a roof hole in the tent and make sure the bottom vents/ flexy tube holes are open, then you can passivly let air into the tent, and you will be venting heat out the top