Well we started burning our Kozy Heat Z42 yesterday afternoon for the 1st time. So far I'm not impressed. We are burning a lot of wood w/ little heat output, I think. The room it's in has been around 64 degrees and upstairs is about 68. I've filled kinda of 2/3 full of wood and haven't tried stuffing it full yet. The wood lasts for about 2-3 hours and is then just coals, but enough to get some dry popple to fire up. I have read a lot on hear so I am not panicking or anything. My initial thoughts are: 1- maybe the blower will be necessary. 2- The wood has been outside and uncovered so it may be too wet. I am suspect of this because it's been sitting for 1.5-2 years and is catching and burning nicely, just not putting out what I would call a lot of heat. 3- It's also 13 degrees here which is a factor. 4- We are just now trying to leave the damper less than 1/2 closed, but I can't imagine how short our burn times will be w/ that setting.