Reducing Closet Temperature

We have 2 plants going in a closet under a 400w HPS. They are currently 4 days into flower, and were grown outdoors in the vegetative stage.
There is mylar on each side of the walls, and a fan blowing from the floor up on to the plants.
The temperate on the thermometer is at 100d F, give or take a small amount.
I would like to reduce the temperate to about 85d F, but I cant put holes in any walls ruling out using an extractor or something like that.
I have the cupboard door open about half way when the light is on to give some air flow with the fan, and the window in the room where the cupboard is open to.

Will having the temperate this high effect the plants? Is there anything I can do to reduce the temperate to about 85d F?

damn...and i thought my veg cab was too hot when it hit 81.5...thats a really high temp your gonna need some type of exhaust fan to remove the hot air...i just have a 6in. circulatory fan on the floor and keep it cracked 6 in. but my temp has never went over 82...u really need to fix the temps cuz your plants will def. die when the temp is 100...at about 90 deg. a plant will die after days of continuous heat, with mass stretching and eventual death...this might sound crazy but try keeping the closet closed a lil more...if i open my closet over 6in. the temp begins to increase at a steady rate...kinda weird but i think the room is actually hotter than my closet

Thanks for your advise with the door, I'll give it a try but I'm pretty certain my room is not hotter than the cupboard.
I tried putting a jug of water in there, but obviously that didn't help. I was crazy to think it might have!


Any more advise greatly appreciated, including information as to what the side effects maybe on the plants.

Can someone atleast tell me how this will be effecting the plants??
Cheers

well, it will cause them to hermie on you, most likely. Thats way too much heat and it stresses them. You really need some way to exhuast this.

I am having a similar problem although only to about 85 degrees, the best solution is to vent the closet outdoors if possible. I am installing an inexpensive through-the-wall exhaust fan, and another small fan pulling air in from my bottom vent.

Even if you can't modify the walls, more/cooler airflow is the answer. As someone said above, your plants will either die or simply stop developing because photosynthesis slows/stops over 90 while the plant just tries to transpire as much water as possible.

Good luck.

these plants were both grown in a wardrobe with ridiculous temps like yours,even hotter sometimes,like you i had a fan blowing with a window open next to it blowing clean fresh air in,i don't feel they suffered much for it

pic 1 gave 4 and a half ounces pic 2 was 4 ounces

Hey guys thanks for the advise, and Atsar for some reassurance the plants will hopfully pull off some reasonably nice bud. Good to see a fellow Scots man on the boards.

More advise, help, suggestions MUCH appreciated.

More advise on reducing the temperature would be great, please and thanks.

I was having the same problem.

Check out what I did, no permanent changes to the original structure at all. (once you put the door back on of course, simple enough though...) If I open the windows at night, letting the cool night air in, then close them up before the temp starts to raise in the morning, I never even have to touch the A/C. On an 85 degree day, the closet didn't raise above 80 with fans on, no A/C all day.