yes, plants need oxygen all night long this is when they make sugar.
In the long run it is better to stop air movement from outside in. that is greater
heat loss than conduction thru plastic or glass. The other problem with burning over
electric is the product of combustion is CO2 AND H2O, there can be a humidity build
up that leads to mold. running both propane heater AND dehumidifier is more costly
than electric. Ingrid

On Tue, 29 Dec 2009 20:01:33 -0500, "Dan L." wrote:
Do plants need Oxygen as well as CO2?
Somewhere between zone 5 and 6 tucked along the shore of Lake Michigan
on the council grounds of the Fox, Mascouten, Potawatomi, and Winnebago