Wow, how did I miss this! I tried the buddy heater and got a terrible headache, I have a roof vent and multiple low level vents that are four times the required vents for the little buddy heater. I tried low and hi, CO2 alarm, you name it. I just kept getting headaches. I gave up and bought an eberspacher bunk heater, it used a heat exchanger, all combustion fumes are externally exhausted. No smell, no issues, works perfect and far more efficient than propane. They are pricey, but I bought a used one off ebay, so far so good. The installation was a bother, but the end result seems much better. Who knows, guess I am one of the unlucky ones that gets headaches from the smell of propane burning...