When winter rolls around, close or cover foundation vents. We explain how to seal up crawl-space vents in winter for a more energy-efficient home.

Q. This week: My five year old second home has a five foot tall crawl space with a concrete floor (copper and PVC pipes and ductwork are down there, and a suspended 80,000 BTU transverse furnace).

Q. My house has four crawl space foundation vents that have flaps that can be opened or closed. The furnace people said to keep the vents closed all the time to prevent condensation from forming on ...

Q : You have often said that crawl space vents need to be opened in the winter. Why is that? I always thought they should be closed to keep my water pipes from freezing. A: I used to think the same ...

Q: I read your online response about crawl space vents. I found it very informative. I reside on the coast. My house is located on a lagoon off the inner coastal waterway. The crawl space floor is ...

My dad tells me I should cover my crawlspace vents when the temperature drops below 25 degrees. My concern in so doing is that we might be inviting problems. Specifically we have had rat problems, ...

Q. Should we ventilate our cabin crawl space or not? Our cabin measures 24-by-40 feet, has a 22-by-8-foot enclosed porch and seems to have been built sideways along a slight rise of fill adjacent to, ...

Question: We live in the Piedmont section of North Carolina, and our home has a crawl space, with crawl space vents placed around the foundation. The vents have a wire positioner that allows them to ...

Q-We have a crawl space under our house that we use for occasional storage. A number of vents were installed that go through the foundation to allow cross ventilation in this crawl space. We were told ...