Another place air leaks in and out of your home is places where the plumbing pipes go through the walls or the floor. If you can pull back the little cover, spray some foam in there to seal up the penetration. That's good for toilets and sinks where pipes go through the wall. For your tub you might have to crawl up under the house. When they put your tub in they probably cut a big square hole for it. Air can get in and out. Take some foam and maybe a piece of styrofoam cut to size and seal that thing up. While you're down there look around for any other pipes or wires going up through the floor and seal that stuff too. Your home will be a lot tighter and use a lot less energy.
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