Thomas,
Another tactic for "I am both trying to keep the cold out and the very
expensive heat generated by my furnace in the greenhouse" on cold days
("A week ago it was still over 100 in my greenhouse but the outside
temperature was 10 degrees.") is to have several fans at the top of your
green house that blow down. This blows the hot air down to mix with
colder sitting near the floor. Warming up the cooler air or cooling the
hot air depending on how you want to look at it. The effect is a closer
temperature more homogeneous from top to bottom in the greenhouse. This
tactic also decreases the amount of time your heater runs if the
thermostat is located closer to the floor then the top of your
greenhouse. I do this in my own greenhouse.
I can't add anything to the ventilating to the outside suggestions you
have gotten expect it sounds like you either need more vent fans, a
larger vent fan, some passive roof vents, or a combination to tackle
your problem of " They barely keep my greenhouse temperature from going
over 110 at 8 feet." If it is possible to install in your greenhouse I
would go with adding roof vents that open and close with changes in
temperature that Denise Nash talked about, more energy efficient.
"If you have anything you are using or any ideas let me know, and lets
keep this discussion online, I would like to see if we can generate
something useful for the archives." I applaud you for saying this.
It allows everyone to learn at the time of discussion, and into the
future. Discussions can lead to new ideas. If Ed Merkle and Denise Nash
had only sent you private e-mails of their excellent posts, we would all
be the poorer and the OGD would be relegated to news posts and
squabbles. Nothing wrong with the news posts mind you, but discussion
is where the OGD gets interesting.
Mark Sullivan
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