My mother has a Harman pellet stove (P65, I think). It's never heated very well. We are currently having a cold spell and she is reporting that she is using less pellets now than when it was warmer. That doesn't make much sense to me, but I'm not a pellet stove user (I use a wood stove). I'm wondering if the stove could have a problem like some Blaze King wood stoves have had. Blaze Kings have a thermostatic control (bimetallic spring/coil) that controls the burn rate of the stove. Some Blaze Kings have been found to have the bimetallic spring/coil wound in the wrong direction (so that it coils and uncoils incorrectly/backwards), thereby setting the burn rate incorrectly (high when you actually want low temps and low when you want high temps). I was wondering if pellet stoves might use a similar device and, if so, has anyone heard of them doing the opposite of what is called for by the temps? Or could someone offer a suggestion as to why she would be using less pellets in a cold snap and more when it is warmer out? Thanks.