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Discussion forum for the various methods and structures used for getting an early start on your growing season, extending it for several weeks or even year 'round.

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Old June 25, 2017   #1
49tandc
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Default How can I reduce heat inside greenhouse.

I do not have electricity (except 12V. solar) in the greenhouse. Standard temps from late May thru Sept is mid 90s here in North Florida. Greenhouse goes over 100 most of the afternoon)

I'm considering running misters on a timer (a 12V solution); Getting a couple of 12V fans from the junkyard (another 12 V that would require another battery/solar panel, etc). or getting a couple of "wind turbines and cutting holes in the plastic to let the heat out.

Do any of you guys or girls have experiences with these methods, or perhaps have a better solution? I'm all ears...


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Old June 25, 2017   #2
Worth1
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Vent/open the bottom and vent/open the tops all the way down.
No I dont have a green house myself but it is the only way you will be able to dump the hot air out without power.

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Old June 25, 2017   #3
Nematode
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Spray the white stuff on the plastic to cut the heat load.
I think its a clay.
Open it as much as possible. Cut it if you have to in a way thats patchable.
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Old June 25, 2017   #4
49tandc
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Both ends of the greenhouse are open, and the side plastic is rolled up for the summertime Just the top is covered in plastic, but its still VERY hot in there. My tomato production is way down. Flowering, but not producing little toms.

Thanks,
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Old June 25, 2017   #5
mjc
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Shade cloth.

What style of house?

What's the spacing on supports? Could you possibly stretch a piece of plywood across somewhat close to the top to mount the turbine type exhaust fan?

Increasing the humidity with the misters will probably make things worse...clumping of what little pollen the heat hasn't fry and increase the chances of fungus problems.
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Old June 25, 2017   #6
Nematode
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Ok only other thing I can find is this:
http://www.greenhousemegastore.com/p.../shade-cloth_1

Pricey though....
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Old June 25, 2017   #7
mjc
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I'd be very tempted to go with this...

https://www.lowes.com/pd/Phifer-18X1...n-Wire/3034437

It will cut down quite a bit of sun. No, it's not quite as sturdy, but it will work (there is 'denser' stuff, too...so check the various offerings).
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Old June 25, 2017   #8
49tandc
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The house is 12 wide X 40 long X 8 ft tall hoop house, with 16 ft cattle panels making the hoop. The shade cloth is laid over the panels and plastic over the shade cloth. I have a steel pipe running down the middle at the peak which supports the tomatoes (on string). It has withstood a couple of very strong topical storms already, but there is no other bracing in the house.

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Old June 25, 2017   #9
Cole_Robbie
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I used to throw mud on mine, before I finally bought some shade cloth.
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Old June 26, 2017   #10
bower
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Short of cutting holes in it, it sounds like fans must be the answer... you already have vented the sides and are using shade cloth, but the top is still trapping heat. The ends should be vented right to the top, and install your fan up there to blow fresh air through the top so heat isn't trapped.

Being in Florida, a solar powered fan would be the obvious solution to no electric on site.
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Old June 26, 2017   #11
My Foot Smells
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hmmmm..... if your outside temp is 90 and your gh only gets to a hundy, that's not too shabby. my gh is storage during may-October, as it can get 180 up in there on a 90 degree day - and that is with cross ventilation (door wide open & 2'x2' window open).

I have a fan and 120v, but pffffffftttt doesn't seem to help much. shade cloth does help - some - but probably need something from nasa if gets west sun. NoFlo can be brutal despite the "north" being in the name & sticky too.

a pic would be helpful, but have to ask why you are in the gh anyways, unless you plan on running some ac up in there.
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