"Christopher Norton" wrote in message
...
The message
from "Ramon A" contains these words:



Better off ventilate than suffocate. The heat loss is not too relevent
IMHO. Unless the vent is huge of course.
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.

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