My temps are too high!!

I have a 20"x36"x62" tent, a 400w MH light in a cool tube, 150 CFM inline fan to exhaust and my temps range from 77 with the lights off to 91 with them on and the ac in the house not running. When the ac kicks on it goes down to 85. My room has always gotten hotter than all the other rooms in my house but I can't do this in any other room cuz I don't live alone. My question is will it really drop my temps that much to pull air from outside the tent and across the cool tube(my ambient room temp is usually 80) and have a y pipe so it exhausts the inside of the tent or would it drop the temp more if I switched to a 250w MH setup? Thanks in advance

You need more air going out was having a similar issue with my setup and had to have the door open or wait for colder months even with the AC set at 69.

Make sure you are pulling the air across your tube not pushing into it. Run duct from an open port to one side of your light then on the other side of the light hook up your inline and exhaust it out the other side. Get rid of the y pipe, I dont think your fan is strong enough to service as exhaust and cooling. I had problems pushing air into my light and switched it to pulling across and it lowered my temps around 5 degrees. You may need a second fan for ventilation but I think dedicating the fan to cooling the light will bring down your temps a lot.

If the room with your grow located in it is already 80F you're never gonna get below 85F with your lights on unless you use AC.



J

Try this link to see if it can help you lower your temps.


http://urbangardenmagazine.com/2010/07/planning-your-grow




J

Get the hot air out of not just the temp but the room too.

Suck the air from the cool tube with it's own strong fan.

If all that doesn't work, switch to 250.

Why would you do all that complicated shit and not just get an ac unit and just plug it up as you would your lights? 77 with no lights is a little high so I would hit the room with ac to get it to the right temp and then itll stay at it when the lights are on.

I would highly highly recommend you look into replaceing your 400w with a solarstorm 400 led light. They have full spectrum so you can veg and flower with it, produce no heat, and are more energy efficent. Also have 2 small t10s to add uv rays. Lots of speculation on weather leds can produce the same results as mh hps etc but after doing a lot of research and most can't but a couple of the top brands that can produce just as well. Solarstorm 400 sounds good for your situation. Leds are usually a big series of 3w lights, but the solar storm has 5w one which makes the light reach the plant very well. The only bad part is the cost, there a grand each, so I say use what u got crop out then sell enough to afford this light and make your growing life easier. unless u already can then go order it now

Thanks everyone for your input. If I could afford an ac unit or the cost of running it I would have done that a long time ago, but it's just not in my budget. I will try some of the suggestions here and hopefully I'll get it worked out

apexzer0 said:

I have a 20"x36"x62" tent, a 400w MH light in a cool tube, 150 CFM inline fan to exhaust and my temps range from 77 with the lights off to 91 with them on and the ac in the house not running. When the ac kicks on it goes down to 85. My room has always gotten hotter than all the other rooms in my house but I can't do this in any other room cuz I don't live alone. My question is will it really drop my temps that much to pull air from outside the tent and across the cool tube(my ambient room temp is usually 80) and have a y pipe so it exhausts the inside of the tent or would it drop the temp more if I switched to a 250w MH setup? Thanks in advance

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I used to have the same issue with high temps and I was pushing air over my light once I started sucking air over the light temps went down I can keep my tent 78 all day with the light on and about 55 at night with the lights off. I also have a 6" inline bringing fresh air from a window into the tent at all times and a 4" sucking through my cool tube into a filter located in my room.