Of course its 21 degrees here and I never replaced the gasket. Just how long does the stove have to sit idle before firing it up. The package says 12-24 hours and it is rutledge if I remember right. Its a hampton HI300 so it has a groove to hold it in place... Its about 4 or 5 years old. Thats about the life span I got out of the gasket on my old insert....sound about right to you guys?