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mattie

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Reply with quote  #1 
Just found this online seems interesting so far ,may give others a few ideas.
http://www.pitgarden.com/

solardan1959

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Reply with quote  #2 
Interesting concept, walipini sounds vaguely familiar I'll have to go search for more info.  Still seems like a pipe dream around here without additional heating but of course that could be done to.  But then we only need to keep it above freezing.  Maybe some movable insulated curtains across the top would help a lot at night.

Dan
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Reply with quote  #3 
Pleased to see our PitGarden site represented here.  Thanks!  FYI we are zone 4B and the greenhouse is definitely staying above freezing without any heat.  With some heat though we've grown some starts in Dec and Jan!  

We do use an insulated concrete tarp and rigid insulation to cover all the glazing at night.  As well we're using water filled trash cans as a heat sink inside the pit.  More info here:

http://www.pitgarden.com/pit-garden-finishing-touches/

Check out this link with more detail on how we've gone about keeping it warm:

http://www.pitgarden.com/heating-greenhouse/

Best of luck to anyone considering a project like this, we're very happy we did it!

solardan1959

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Reply with quote  #4 
Prepper,
   I posted this before I got through your documentation, I did see your in Montana, same as Duluth MN but with more sun, and I saw you do use insulated blankets and foamboard to cover the glazing at night after I posted.  Staying above freezing is a major achievement this far north. I put a lean to greenhouse on the back of my garage and while it gets plenty warm when there is sun it stills gets pretty cold in there at night.
   I never added any water storage but have a 2 foot insulated front wall and insulated side walls with 6nn twin wall glazing.  I at one time thought about running some plastic sheeting on the inside of the 2x4 "stringers" that the twin wall is mounted which would give me 4 inches of air space for additional isolation from the -20 temps but never really thought about a removable foamboard layer which would probably help a lot to keep the heat in.  Last year, my first, I did add a milkhouse heater to try and start my seeds a little earlier but I think we did not pay them enough attention and they kept drying out during the day with the high heat.  I should look at some type of insulated blanket I could easily raise and lower for this year and see what difference it makes.  My greenhouse, Solar Web Page > Forums > Member Projects! > Solar Dan's Sunspace
[image] 
Inside early on, have more grow space now.
[image] 

Dan
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Reply with quote  #5 
Very nice Dan!
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