We had a Harman pellet stove installed in December. Picked Harman because we heard it was an excellent product. When the installer fired it up, it smokes quite a bit in the room. We were told because it was new, although a showroom model so used a little, it would need burn-in time. Since we've been using it, I wake up with a sore throat and cough a lot. Is this normal? It's been almost a month now. Today it is 11 outside so it is the first time we used it all night. Love it except I feel like I am sitting downwind from a campfire all the time and feel like I need to open the window to get some fresh air which defeats the point of getting it.