I have the smaller Buddy heater and it seems every time I use it for an extended period, I end up with a headache. Not sure if the CO sensor is working correctlyjsriley5 said:I don't have a big buddy but have a regular one. extrapolating up and adding the nifty idea of a battery operated circulating fan I think a big buddy or two would be about the best thing going for a portable heat source. And the safety factor is a big deal with them as well as they have a truly working low oxygen/carbon monoxide cut off. I have and sue some of the much cheaper heater heads that hook on a propane tank but I rarely reccomend them to folks I dont know simply because they lack a safety feature. The lil buddy rocks the big buddy should rock twice as much or more.