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Mini greenhouse needs better climate control


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#1 Alc ONLINE  

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Posted February 26, 2011 - 07:51 AM

I added a 2 tube 40w grow lights and the home made grow mat from a rope light last week. Put in 4 tomato plants , onion seedlings and lettuce seeds. Even with the auto opening lid it had a high temp. of 146 with a low of 24 in a 24 hour period!!!!! So after 1 week I froze the tomatoes , baked the onions and lettuce seeds.!!!!!! The only thing that made it though is the lettuce that's been on the lower section all winter .DSC07669.jpg

#2 JoshBrown OFFLINE  

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Posted February 26, 2011 - 10:20 AM

I would like to have a little greenhouse like that when you get all the bugs worked out post the finished greenhouse. It looks good though.

#3 DH1 ONLINE  

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Posted February 26, 2011 - 10:34 AM

Can you circulate some air from inside the house though it, use a small fan.

#4 Texas Deere and Horse OFFLINE  

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Posted February 26, 2011 - 10:51 AM

Can you circulate some air from inside the house though it, use a small fan.


Al, I think that DH1 has the right idea, maybe you can use something like a dryer vent tube and a small computer pancake fan to circulate air from the house and back. It would take to holes into the house.

#5 Reverend Blair OFFLINE  

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Posted February 26, 2011 - 11:52 AM

Yeah, I'd force some air in with a fan. You likely want to run that so the cold air is heated somewhat before it hits the plants...the goal is for relatively consistent temp. because large, fast shifts can "shock" the plants.

#6 MH81 ONLINE  

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Posted February 26, 2011 - 12:37 PM

I agree with the air handling. As to the plants, what recipe did you find for frozen tomatoes, cooked onions & lettuce?

#7 daytime dave OFFLINE  

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Posted February 26, 2011 - 01:11 PM

That's a pretty big temperature spread. Good luck with the fine tuning.

#8 Alc ONLINE  

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Posted February 26, 2011 - 04:58 PM

I agree with the air handling. As to the plants, what recipe did you find for frozen tomatoes, cooked onions & lettuce?

The tomatoes wilted so bad you had to look hard to see they were ever there !!!!!!!

#9 DanO OFFLINE  

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Posted March 02, 2011 - 07:01 PM

That Greehouse looks Pretty Neat...Regarding the temp. control, I made a small greehouse from old windows salvaged from a renovation job I did years ago and I rigged up low wattage Heat lamps to a Dusk To Dawn sensor outside aimed EAST, so the heat lamps came on during the overnight cold hours and then shut off about 7 am when the Sun took Over. I also wired in a small 4 inch Muffin Fan for circulation of the heat. That worked out really well for me.

Edited by DanO, March 02, 2011 - 07:23 PM.


#10 Alc ONLINE  

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Posted March 03, 2011 - 11:05 AM

Think one of the problems with my set up is it's hinged at the very top and as the auto opening lid opens it still traps hot air near the top shelf where the grow mat and light are .
I found an old thermostat sw from a roof ventilator fan. Just need to fine a small 120v fan , I'll try mounting near the top and have it blow down towards the opening . If I would make another one , I would have 2 lids , having the top section with the auto opener , this way the hottest air would vent out.

#11 JoshBrown OFFLINE  

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Posted March 03, 2011 - 11:18 AM

Yeah I agree the auto opening lid would work better if it opened the top portion of the window.




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