"Ramon A" wrote in message
...
Harold, This was my original thread - Thanks for the input. May I explore
your comment further. Are you saying that for the general use of a gas
heater to keep frost at bay in wintertime, and with a thermostatic control
on the heater then Venting for safety reasons should not be a worry -
assuming that i do not stay in the green house with the heater on and the
door shut - of course???
Ramon:

Here is my experience over the years dating back to the 1940's. First using
a parrafin heater and then a propane heater. In the winter the parrafin
heater was on 24 hours per day and the same with the propane heater.(the
propane heater being thermo controlled). I stayed in the greenhouse long
enough to do all the work I needed and basically the only "venting" that I
used was the opening and closing of the door when entering and leaving plus
any "leaks" there might have been.......whatever "leaks" there might have
been were only minor. Sometimes the work in the greenhouse was a couple of
hours or so.........all I can say is that I am alive and a very healthy 78
year older....I am using the past tense as I relocated a couple of years ago
and am now sans a greenhouse......Harold W.........

Ramon



8-))////////////////////////////you might suffocate if you have the
heater
on 24 hours per day and you sleep in the greenhouse........I am still
alive
and never vented when using my propane heater......and, as David Hill
said,
carbon dioxide is a benefit. Large commercial greenhouses owners spend
big
money on a carbon dioxide generating system.

Harold W.