Greenhouses forum: Greenhouse C oling

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Name: Cheryl
Texas (Zone 9a)
Region: Texas Greenhouse Plant Identifier Plant Lover: Loves 'em all! Plumerias Ponds
Foliage Fan Enjoys or suffers hot summers Tropicals Garden Ideas: Master Level Garden Sages Million Pollinator Garden Challenge
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ShadyGreenThumb
Aug 20, 2017 3:42 PM CST
We know a greenhouse can become a hot house during the summer. No stranger to that here in Tropical Southeast Texas! I always have the box fan going 24/7. I have a portable a/c unit to plug in when I have to do some serious work inside. But I have found that unless it is absolutely necessary, the hot summer is not the best time to re-pot. But I do work in there sometimes to add a taller stake or clean up a potted plant. But for the most part, except for one very mature pothos, it is empty in there in the summer.

A light bulb went off in my head two days ago. I had always had the fan facing outward to suck the hot air out. All windows are open and when there is a breeze I thought to get that hot air out of there! But I reversed it, bringing the fresh air in then forced out of the upper roof windows. When the Heat Index is 108º, it "just" 92º in the GH! Believe me, you can feel a difference! Don't tell me this is the way I should have been doing it all these years??
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Name: Sandy B.
Ford River, Michigan UP (Zone 4b)
(Zone 4b-maybe 5a)
Charter ATP Member I was one of the first 300 contributors to the plant database! Garden Sages Million Pollinator Garden Challenge Seed Starter Vegetable Grower
Greenhouse Region: United States of America Region: Michigan Enjoys or suffers cold winters Butterflies Birds
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Weedwhacker
Aug 21, 2017 3:45 PM CST
" Don't tell me this is the way I should have been doing it all these years??"

I can't say about your location -- but up here, where the GH still can get unbearably hot in the summer (well over 100 degrees), I discovered that orienting it north-to-south, instead of east-to-west (the way my original GH was) creates a LOT better natural ventilation. My 8x15 Rion GH was sited east-to-west after doing some research as a GH newbie; it had 6 roof vents and a wide door on one end. That thing got WAY hotter in the summer than my 7x15 hoop house and also the new 16x20' hoop-type GH, neither of which has roof vents but both have doors on each end. (I haven't used fans in any of them.)

I'm glad you found something that works better for you, Cheryl ! Thumbs up
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Name: Cheryl
Texas (Zone 9a)
Region: Texas Greenhouse Plant Identifier Plant Lover: Loves 'em all! Plumerias Ponds
Foliage Fan Enjoys or suffers hot summers Tropicals Garden Ideas: Master Level Garden Sages Million Pollinator Garden Challenge
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ShadyGreenThumb
Aug 21, 2017 3:54 PM CST
The roof vents go north-south. The fan is on the east side blowing west. I have it hooked up high in the doorway hoping the hot air in the upper surfaces will blow out.There is no door or window on the west side. But the GH is for the most part shaded by trees all summer. But it still gets to over 100 in there.
Life is short, Break the rules, Forgive quickly, Kiss slowly, Love Truly, Laugh
uncontrollably, And never regret anything that made you Smile.

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