I have mixed feelings on this one. I bought one for use in the mountians. About about 8500 feet, there are issues getting it lit. When contacting thermacell about the problem, they say that they are not designed for operations in high altitude. I tried getting it lit once up a Pass lake in the Uintah mountains. It took a while. Once it was lit, it worked great. I have used it at lower elevations, 5000 feet or less and it worked well.
Good luck, Dave