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A home with a dirt crawl space costs more to heat and cool. If your crawl space is vented, those vents make your floors cold upstairs. This is not only uncomfortable, but it costs more to heat your house.
Houses with dirt crawl spaces have damp air. Damp air is more difficult to heat and cool, requiring more energy to do so, and this costs more money. Damp air puts more of a load on the HVAC system. Everyone knows they need to run their AC more on a humid day. But what about humidity from inside the building? Same thing. If you get rid of the humidity from your crawl space, you save money on heating and cooling costs.
How much money could you end up saving? You will save 15% to 35%! That's a lot of money! Over the years, it really adds up! You are paying the price each and every month in higher energy bills, by living in a house with a dirt crawl space. Of course, there are variables, such as how many vents you have, whether you live in a one or two-story home, if you have ducts in the crawl space, how big your crawl space is, etc.
These penalties from living with, and the savings from fixing the dirt crawl space problem are real and have been proven time and time again. Advanced Energy, a private non-profit organization funded by both public and private funds, has done studies to measure these effects. The results can be found on their website.
In fact, the energy loss is so substantial in a home with a vented dirt crawl space with ducts, that you may as well ignore all other ways to save energy and make your home more comfortable until you fix the crawl space problem. Caulking around a window, or weather-stripping a crawl space door, would be like patching a tiny hole in a rowboat and ignoring the foot-wide hole on the other side.
Controlling air infiltration is the key to energy conservation in any home or building. Closing up those giant holes in your crawl space walls, and eliminating the "reason" (exposed damp earth) why they were there in the first place must be a top priority.
In one Advanced Energy study, the organization experimented with 12 identical new homes in a Habitat for Humanity subdivision. Some of the homes had vented dirt crawl spaces, and others were sealed, much like we will recommend in this book. By sub-metering the heat pumps, they found that homes with vented dirt crawl spaces cost on average, $28 more to cool in a single month! (June of 2003) But there are a few catches with this study.
First, the homes were small. If the homes were twice as big, we might expect twice as many dollars saved in energy costs in the same month.
Second, the ones with a "vented crawl space" had two things going for them that the average house with vented dirt crawl spaces does not. They had a 6 mil plastic ground cover down on the floor, and they had their ducts sealed.
In a 100 house study in 1994, Bruce Davis, from Advanced Energy, determined that the average house has more than 300 cubic feet per minute of duct leakage, of which these comparison homes did not have.
If this control group of houses had been more like the millions of real homes across the country we see each day, the difference in energy use would be even more dramatic.
Nevertheless, it doesn't take long before the numbers add up to serious money. Add to that the benefits of preserving your home's value, and eliminating rot repairs and mold remediation, and you see that fixing your crawl space is one home repair you can't afford not to make.
Spread across the 26 million homes with dirt crawl spaces, it is estimated that with just a 15% energy savings, homeowners in the U.S. would save 7 billion dollars annually! That's a lot of money that could be better spent somewhere else.
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