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Greenhouse

 
pioneer
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Location: Fresno Ca Zone 9b
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Hi,
Dreaming about enclosing my covered patio to make a greenhouse out here in Fresno Ca. How much warmer do you think a nonheated greenhouse would be than outdoor winter temperature? Also, how much hotter might  it get in summer?
 
gardener
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Hi Kimberly
Unfortunately most of the answers depend on a lot of different factors.  What direction is your patio facing, how much direct sun will it get? ...
I can tell you I had a little plastic greenhouse in N. Ca. Zone 9 b, and it was super hot in the spring. I would have to leave the door open, or my plants would fry.  As far as winter goes again a lot of factors can determine the temp.  There are things you can do to help keep it warm. Like paint water, or milk jugs black and fill with water.
I'm not much help, maybe someone else will have more information for you.
 
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Designing your roof for the position of the sun in winter to hit the back wall/passive heat sinks, and shield them in the height of summer seems to be the key to make it work. Can you dig ? Maybe you want a walipini type setup...https://www.youtube.com/watch?v=Qvk7Sszh6fg
His mushrooms under the floorboards idea is GENIUS...
 
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Non heated greenhouses are able to be as much as 10-15 degrees warmer than outdoor winter temps in areas like Fresno. However, be aware that when summer rolls around they can become a sauna depending on how much they are trapping the California sun's rays!
 
Kimberly Agnese
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John Ian Smith wrote:Non heated greenhouses are able to be as much as 10-15 degrees warmer than outdoor winter temps in areas like Fresno. However, be aware that when summer rolls around they can become a sauna depending on how much they are trapping the California sun's rays!


That’s what I thought.. maybe removable plastic walls?
 
John Ian Smith
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That's a great idea! You can definitely use those plastic walls to trap some of the warmth, but it's important to keep an eye on the temperature during the summer. If it starts to become too hot, you can always put the walls aside temporarily to give the plants some relief.
 
gardener
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Location: Rocky Mountains, USA
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Just as one rule of thumb, Eliot Coleman says, "Every layer of covering moves your crop 500 miles south"
 
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I've been watching this post because I have a similar interest.

I have an east facing un-insulated sun-room, the roof is aluminum over wood, trusses North to S. and the ceiling has been enclosed. Full window surround from N, E, to S.. East wall is the long wall 24'. windows are 16" up from the floor.
At first I thought I could do the same. Then after observation( A full cycle of the seasons- 1 yr) it's actually Full shade to partial-light w/ very short <2hrs dispersed direct sunlight in the mornings(trees). In the dead of Winter I get full sun through the S windows for <6hrs in an area of about 24" at floor lvl. When I started seeds it was maybe 16" and shrunk from there. No DSunlight ever from the N. Other than morning mottled DSunlight I don't get enough for most plants in general. It's not ideal for sprouting seeds on the S wall either.

Do to my Geo-location and all the above.
I would have to remove the roof, sheeting, ceiling and replace with polyC(or cheaper). After high noon the DSunlight would slowly turn to shadow and shrink toward the East wall till maybe 4pm, which would be good actually.Except for the fireplace shadow.

Even though I refer to it as the "Sun Room" it's actually a Shade Room(Enclosed Patio). would take major conversion/construction to change. I could  get an estimate for the construction and then price some prefabbed greenhouses and keep the covered patio. They have some really nice one's anywhere from a few $K to 10-15k , but I know It's way out of my budget and I don't want to try to do it myself even though I could. It's just not practical in my opinion.
My definition of a "Greenhouse" is a Shelter  that requires No Artificial Light and the temp and humidity can be controlled.
Hopefully the OPs' roof can provide enough Sunlight if at all.

My Solution
I bought cheap shop lights, hung a few, built an adjustable stand for 2 others. I'll show some pictures one day. <$65
I also bought a cheapy "greenhouse" 15x7, the little green one's come in white too. By then it was too hot to go through the trouble and put the cover on. So I also bought a 50% shade cloth 14x20 something to cover, <$160

I found a pic of CheapGH, In the upper right you can see the Shade Room. The beauty of the GH is it's so easy to move, The ugly is one mistake in crinkling the cheapy pipes or bend and it's toast. It's hard for me to recommend it for any longevity. I think it will be real iffy with the cover in high wind.
I didn't even stake it at all. The shade cloth is what holds it in place. Survived 40+ gusts so far, I think because it can still wiggle and flex and the shade cloth has just the right tension. The paracord leads at the corners have dbl. slip-knots for give. The lines that run through the eyelets are independent of the corner leads also with dbl. slips. After assessing the greenhouse and my options this is what I chose.
The initial plan was to build a 2x6 base for it, and pipestrap it. But, I want to be able to move it easily as I convert the front yard into whatever it ends up besides grass.
20230509_ChpyGrn2.jpg
shade cloth greenhouse
 
steward
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Location: USDA Zone 8a
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Hi, Kimberly

We have had several folks with threads on a similar idea so I thought you might get some inspiration or ideas from these:

https://permies.com/t/120728/passive-solar-greenhouse-ventilation
https://permies.com/t/68324/Seasonal-greenhouse-cover-porch
https://permies.com/t/58304/Greenhouse-lean-porch-veranda

It is okay if you already found them because these threads might inspire someone who wants to do the same thing.
 
Kimberly Agnese
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Location: Fresno Ca Zone 9b
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Thank you Anne:)
 
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