[Market-farming] Market-farming Digest, Vol 108, Issue 12

Sandy Charles sandycharles at comcast.net
Sun Jan 8 20:07:02 EST 2012

I'm in Fort Collins at latitude 40 and 5000' elevation.  We have an 
inordinate amount of bright sunlight through the winter that I feel is key 
to the growth I experience.  I'm on the plains just east of the foothills, 
so get very high winds.  Not much else to speak of in the way of 

The most I pay in electricity to run my thermostats and fans is $15 month, 
and that's only for about 4 months.  The high tunnel size is 20x40, with 280 
sq ft planted.

I'm in the process of creating a blog that will have all of my year end 
reports with data, pictures, building process etc.  I have wanted to share 
with this group but have been waiting till I had a couple of seasons under 
my belt to be sure it was consistently successful.  I'll let you know when 
it's up.


----- Original Message ----- 
From: <market-farming-request at lists.ibiblio.org>
To: <market-farming at lists.ibiblio.org>
Sent: Sunday, January 08, 2012 10:00 AM
Subject: Market-farming Digest, Vol 108, Issue 12

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> Today's Topics:
>   1. subterranean heated high tunnel (Sandy Charles)
>   2. Re: subterranean heated high tunnel (Vern and Amy)
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> Message: 1
> Date: Sat, 7 Jan 2012 15:02:25 -0700
> From: "Sandy Charles" <sandycharles at comcast.net>
> Subject: [Market-farming] subterranean heated high tunnel
> To: <market-farming at lists.ibiblio.org>
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> Vern,
> The high tunnel is heated by warmer air that is drawn from a duct near the 
> high point and sent underground to lengths of perforated French drain pipe 
> that run the length of the tunnel.  The ground acts like a "heat sink", 
> never freezing even in our subzero temps.  The subsurface air that is 
> displaced by the warmer air is then exhausted into the growing space.  The 
> key I'm finding is to plant the kind of vegetables that will take extremes 
> of temperature in a day, and not really mind freezing every once in a 
> while.   The greens I have growing can be frozen solid in the morning and 
> thaw when the sun warms the space - and they remain in perfect condition.
> I'm happy to relay more information if you like.   I've been doing a 
> formal study for the local university so have all kinds of data... I got 
> the design for this system from this website, which goes into all the 
> detail you'd ever need.   http://sunnyjohn.com/indexpages/shcs.htm
> Sandy
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> ------------------------------
> Message: 2
> Date: Sun, 08 Jan 2012 06:55:11 -0800
> From: Vern and Amy <vaspencer at sisna.com>
> Subject: Re: [Market-farming] subterranean heated high tunnel
> To: market-farming at lists.ibiblio.org
> Message-ID: <4F09AE4F.6000409 at sisna.com>
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> Sandy,
>    Very innovative idea.  I will check out the site.  I would be
> interested in more information on your trials, as would probably others
> here.  Do you mind giving your location and any special microclimate
> details, which may be relevant to someone evaluating whether this may
> work for them?  Thanks.
> Vern
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