After trying a few different types I tried this one. It’s been running non stop basically for the past month here in Colorado. It keep my little house above 70. It is not as efficient as other I have tried but it has been the most reliable. Others I have tried (Maxpeeding Rods) have stopped working with in 24-72 hours. I am really happy and super impressed by this little unit. If it makes it one winter I will gladly by a new one every year if needed,