serious heat problem

[motman]

i have a heat problem, and would appreciate some help.
here are the specs:

grow room is 4fx4fx6.6f (1,2mx1,2mx2m). running a 400W Son Agro HPS. got a fan circulating air inside. extractor is 4,7inch ducting (120mm) with 190m3/h inline duct fan.
inlet is one hole with 5,1inch ducting (130mm) with 205m3/h inline fan.

the temp with light on is between 31.5 C and 38 C (88F and 101 F).

I don't have a cooltube (Don't get them in S.Africa, and too expensive to import). Air cooled hoods are also not available. a mobile air con is on the expensive side too.
is there anything that i can do otherwise to bring the temp to a constant 26C (78F) without expensive equipment? the humidity ranges between 31 and 40. i'm in vegistative growing stage, and would like to get the humidity up to around 50-60.

My grow light is under an adjust-a-wing reflector, suspended from the roof of the growing room. how can one attach a sheet of glass to the under side of the reflector?

Last night I put the 200m3/h extractor in the growroom with the 150m3/h extractor already in there. The inlet is one 130mm duct, with a 5m3/h inlet fan. temp is only down to around 31 C. I put the one extractor duct against my face, and the air isn't even hot??? still hot inside.

the growroom is a simple wooden structure, and the sides are white roof insulating plastic, with black roof insulating plastic outside. roof is hardboard (pressed wood)

a container with water inside the room does nothing. does extra CO2 raise the temp a lot?

The temp outside the growroom is around 28 to 30 C. The growroom is inside an outside room, extra “granny flat”.

 

[POTUS]

Are you venting your "hot" air to the outside or into the room outside your grow room? It sounds like you need to increase the amount of air flow through the grow room to outside the house. If the room temp outside the room is 30C tops, then increase your air flow that draws from that room into the grow room and outside the house so that the temps drop to no lower than 30C.

More air flow out of the hot room. That's the secret to keeping the temps down.

Growing MJ isn't free or even cheap. It's just way cheaper than buying it on the street. Equipment has to be purchased.

Good luck man!

 

[allgrownup]

you don't need to spend a hundo on a vented hood. take the hood you have and cheese grade it. then go to home depot and get some ducting.

you can vent that hood for cheap. may be a pic or 2 in my GJ.

peace