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Hobby Greenhouse Help !


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#1 jpackard56 OFFLINE  

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Posted March 23, 2014 - 08:04 PM

Well this seemed like a good idea...

 

Momma and I aren't getting any younger and working with cold frames last year I really got the bug to put up a small greenhouse so as to not have to be squatting down with the frames. Well the kids came over and we had a fun afternnon setting her all up last fall, I threw some pots and such in it for over the winter and have been thrilled everytime I look at at that nice little greenhouse thinking about spring. Well spring is here ???

 

Anyway I started setting things up and put a nice big thermometer in there that I can read from the house. Yesterday it was 50 F and sunny outside-- the thermometer was pegged at 120 F in my little green house!!

I never even thought about it getting TOO HOT !!

Today was 35F mostly grey with wind chill around 15F and it still read 85 in there this afternoon. Suns been down a while, 22 F outside 34 F inside right now.

 

Anybody else have any experiance with a small unit. ( 6 X 8) and  about 7ft high in the center, gable roof, all sides are roughfly 1/4 inch thick plastic panels that are formed kinda like cardboard wth the roughles between two flat sheets can't quite see thru them sorta lika a shower door look.

 

I'm befuddled, I've been thinking about heating it somehow and it looks like cooling maybe a bigger issue...

 

 

 

 

 


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#2 grnspot110 ONLINE  

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Posted March 23, 2014 - 09:20 PM

You'll need a vent of some type, I use a louvered vent on a timer (behind small brown door in second pic):

 

HPIM0527 - Copy.JPG

 

HPIM0525 - Copy.JPG

 

& shade cloth:

 

HPIM0526 - Copy.JPG

 

Lowell


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#3 oldedeeres ONLINE  

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Posted March 23, 2014 - 11:24 PM

Lowell is right, a vent is needed. I'm pretty sure you can get something set up on a thermostat as well. Heat is as hard on plants (and gardeners) as cold.


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#4 JDBrian OFFLINE  

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Posted March 24, 2014 - 05:12 AM

As said, you need a vent. I think Lee Valley Tools sells an automatic vent that opens when the temperature is above a certain point. It's a good safety feature to install when you may not be home to open a manual vent.


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#5 boyscout862 ONLINE  

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Posted March 24, 2014 - 05:17 AM

That solar heating works well for houses too, it you build them right. Harbor Freight used to sell the automatic openers too. They are often labelled for cold frames. Good Luck, Rick


Edited by boyscout862, March 24, 2014 - 05:18 AM.

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#6 Alc ONLINE  

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Posted March 24, 2014 - 05:23 AM

I used one  those HF automatic openers boyscout was talking about on my mini greenhouse and they work very well , in fact bought 2 more so I can make some kind of cover over the raised bed .

 

 http://gardentractor...ini-greenhouse/


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#7 Hammer OFFLINE  

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Posted March 24, 2014 - 09:01 AM

I agree on the ventilation and the shade tarps. 

 

We have a much bigger set up at work, but theory is the same. You can use vents that open on a thermostat then use a powered fan to force hot air out as needed. Even a small fan circulating helps. 

 

IMG_5766_zps6de0200a.jpg

 

 


Edited by Hammer, March 24, 2014 - 09:02 AM.

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#8 oldedeeres ONLINE  

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Posted March 25, 2014 - 12:22 AM

Lee Valley is a great place to get gadgets that work, and if by chance they don't, just tell them so and they will replace at no extra cost. We deal with them a lot--- Olde Deere#2 is pretty much addicted to their catalogues, lol.
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#9 skyrydr2 OFFLINE  

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Posted March 25, 2014 - 07:37 PM

I just fired up mine tonight. Running it at 70° for the fresh little plants .mine is the same type with the panels. Its 27° right now and the little electric heater is doing fine. Mine has a roof vent about
And MIL to watch it so it doesn't getto warm in there.
Tomatoes, peppers and cauliflower are growing right now with cabbahe and broccoli getting started in a few weeks .
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#10 jpackard56 OFFLINE  

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Posted March 26, 2014 - 08:08 PM

Wow what a great response ! Thanks all !

I'm hoping to fit a sun shield from a dog kennel as a shade for now until I can get a proper one. The opener I'm checking at HF as suggested and Valley Tool and Charleys Greenhouses for price and quality. Till then we are trying to remember to do it by hand. Suppose like anything worthwhile it takes some time to sort it all out, we've been in the teens at night this week so if we can keep from "cooking" them in the day we should be ahead of last year. Thanks again everybody !


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#11 skyrydr2 OFFLINE  

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Posted March 27, 2014 - 03:15 AM

Cold and windy last night, outside temps in the low teens... Like 14° low and very windy. The temps in the greenhouse went as low as 57°, but at the benches it was in the 70's because the heaters are right under them.




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