I use a Portable Buddy in a 1972 Corsair (21') in -20c weather while fishing for Steelhead. I keep the Roof vent cracked and a window cracked for cross ventilation and also a 12v fan (boondocking) that I place close to the window to draw fresh air in and it also circulates the warm air.I had the Buddy heater tested for CO2 emissions by a Gas technician friend with his $700.00 dollar tester and the levels were very low.I also have a Portable CO2 monitor I place above the heater on a shelf as backup to the one on the Buddy heater.(P.S.) If you are the market for one of the best fans any camper or sail boater should have when running off your battery
, try the 12V fan made by a company here in Ontario called Caframo.
The draw on the battery
is next to nothing and the amount of air circulation is amazing. Its great for moving heat around in your trailer or keeping you cool in the summer.It retails for around $55.00 CAD.John