Saito shares, ‘Manual crawl space vents, which are usually $15 to $25 per unit, run lower than the automatic crawl space vents like this Master Flow Automatic Foundation Vent from Home Depot ...

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 ...

Also, install vents on opposite sides of the crawl space to help ensure good airflow. Advertisement Section R408 of the IRC code lists requirements for ventilating under-floor spaces (crawl spaces).

If at all possible, the crawl space vents should be permanently sealed and a dehumidifier installed in the crawl. Try to maintain the humidity at a constant level below 70 percent.

As colder weather settles in along the Front Range, crawl spaces and attics require attention. Do you have rotating turbine vents on the roof? It’s a good idea to shroud them with a garbage bag ...