We've had a ridiculously cold kitchen since we moved in. It backs onto a "3-season room" that has too many windows, little insulation, air leaks. That's normal for a 3-season room. The problem was that the previous owners separated that room from the kitchen with simple wooden free-floating sliding door with windows that doesn't entirely close. We have a draft kitty to block the half-inch gap under the door, but much of the door just doesn't make contact with the frame. The molding doesn't help much. How cold? Put it this way. Our cat's wet food, a high-meat content food for diabetic cats, remains "just out of fridge" quality for hours. On cold days, a thermometer on the counter near the door could read in the high 50s, and I suspected the floor near the door could be in the 40s. Today, I had a handyman here to look at a number of issues. He said he would think about the kitchen door issue, but never came up with anything. But, he sealed 3 quite leaky basement windows. It must have been drawing through the kitchen and into the basement, because nothing else that would be relevant happened, but the kitchen is much less drafty and much warmer now. It came as quite a surprise.