Phisherman wrote:
On Mon, 28 Dec 2009 12:48:05 -0800, "Steve B"
wrote:

In another newsgroup, there's a discussion about heating a greenhouse.
Electric heaters were mentioned. Also kerosene, but comments were made
about fumes and stickiness. Someone recommended a plain propane barbecue.
It was stated that the CO2 would be good for the plants. I was wondering
about the CO produced, and what the levels would be.

What is the best/worst ways to do supplemental heat in a greenhouse?

Steve



What does "best" mean? I tend to think energy effeciency for a
greenhouse, using sunlight and compost to heat the space.


Depending on your needs, I think you will be hard pressed to heat
only with solar or steaming compost.

Solar requires thermal mass and added insulation.

I've got a string of nights here in the 20's, so I'll see. I've been
adding both thermal mass and insulation. I do have a heat lamp on a
timer... It's my first winter with the "solar cabana", so much remains
to be done.

With that said day time temps have been a delight inside with outside
temps in the the 30's.

No objection to any form of heating, but insulation is often overlooked.

Jeff


Have you
ever seen hot steam coming off a compost pile in the middle of winter?