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>>CO is the real baddie - colorless, odorless, and very poisonous. But don't discount the potential for problems from CO2<<

The difference is that CO2 triggers hyperventilation. As CO2 levels rise, the human body gets really uncomfortable to live in and you will seek fresh air pretty quickly. I'm not saying to seal up a room, fire up a propane heater and go to sleep, but CO is orders of magnitude worse than CO2.

ALWAYS be aware. That said, propane forklifts can run in buildings without issue. Can't say that about Gasoline. The best option for zero emission is electric, but we're talking about heat, not power. Propane can be used indoors with proper monitoring and with adequate air exchange in a particular space. The air exchange doesn't necessarily mean powered ventilation...simply regular leakage. If your house is a standing R-40, you're going to have some problems. My house is probably R-1, heh.

I think we're on the same page, we can however warn people to use propane properly and with good equipment and monitoring so that it's safe.