Insulation is key. Others can and have said it better than me, but the heat output from a pellet stove is best described as "gentle," unlike the blast of heat coming out of a big honkin' wood stove. It's essential to hang on to those BTU's and really make them work for you. We installed our pellet stove with an Outside Air Kit (OAK) in 2008 (see signature.) We were told that our stove would "run us out of here." We spent that winter feeling cold and disappointed, and eyeing the stove and the pellets suspiciously. I will admit to having the memory and the mindset of the wood stove craze of the 1970's, during the Arab Oil Embargo, when family members' wood stoves would indeed run one out of the house with heat. It wasn't unusual to walk into someone's house in mid-January and find the wood stove rolling full blast and a window opened. Slowly, with the help of Hearth.com members, I got to know and learned to love our pellet stove. The heat is different. It puts out BTU's but you can't be wasteful of them, because there isn't a lot of excess when you are trying to heat a large space with it. Also, along a slightly different but connected flow chart of problem solving, we replaced the old and undersized central a/c unit. After a brutally hot summer in which the new, appropriately sized central a/c unit struggled to keep up, followed by a brutally cold winter in which the pellet stove struggled to keep up, we got serious about insulating our attic. The difference was noticeable and it registered, in plain numbers, on the digital HVAC thermometer in the center hallway of the house, on the day that the attic insulation was installed. That day. Within an hour or two of the installation. So yeah, there was our problem. We've since done additional things to help- it's now a game of inches and pennies on the dollar, but we've yet to see diminishing returns. Our house is brick and block with no wall insulation. Surprisingly, insulating our electrical outlets and switches with UL approved inserts made specifically for that purpose, plus child safety plugs in all sockets that we don't use continuously, made a noticeable difference as well. We insulated the outlets and switches on the outer walls first. It made such a difference that we spent this past Saturday insulating all of the outlets and switches on the interior walls as well. (I posted a thread about it on this forum.) My husband also went around the house with a can of spray insulation foam and plugged up the holes where our plumbing punctures a wall. As far as insulating electrical outlets and their prong openings, plus switches, it also makes a difference in new construction if the builder didn't install insulated fixtures. We have a new construction property to which we hope to retire in a few years. Winters at that location can be remarkable, with wind coming off of the nearby water with significant wind chill. The highest wind we've recorded at that location NOT associated with a storm system, just plain old winter wind, was over 60 mph, directly impacting the back of the house with no wind break. I've stood in the back rooms on windy days (albeit I've not been there for the 60 mph winds yet) and felt wind blowing into the room from the prong openings in the electrical sockets. Through the prong openings, mind you... To that point I'd blown off insulating electrical outlets/switches as small stuff, and wondered if it was worth the time or the money. That moment changed my mind, at least for that location. The difference there was so noticeable that we followed through for the fixtures on the exterior perimeter of the brick/block/no wall insulation bungalow in town. And that made such a difference that we've moved on to the fixtures on interior walls. NOW ALL ELECTRICAL SOCKETS AND SWITCHES WILL BE INSULATED. Yeah, I've gotten a little obsessive/compulsive about insulation since the feedback from doing it has been so direct, so immediate, so noticeable. I'm a bit like Pavlov's Human in the Insulation Aisle at the Big Box Home Improvement Store. SAVE ME A PENNY ON MY UTILITY BILLS AND I'M YOURS FOREVER. What were we talking about again? OH- big congrats on your new pellet stove!