On Tue, 29 Dec 2009 15:05:09 -0800, gunner wrote:

"AZ Nomad" wrote in message
...
On Mon, 28 Dec 2009 13:10:47 -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?

Strange. I always used sunlight to warm a greenhouse.


perhaps you should consider patenting that technique and attach a a switch
so you can turn it on at night.

Use a layer of rocks on the floor to hold heat from the daytime sun.
This isn't rocket science.