If you have foundation vents you can install ones that close when it gets cold. (Mine close when it drops below 50.) Otherwise I'd concentrate more on insulation to keep the crawl space cold air from seeping into your house. And insulate your cold water pipes, of course to avoid freezing. (Insulating hot water pipes may also give you hotter water.)
I'm sorry but I don't have experience with that issue. Hopefully someone else who does will comment. It might be possible to use hay bales as CribbsStyle mentioned using for blocking vents. But as CribbsStyle also mentioned, you might be inviting nesting. The only other thing I can think of is to use heavy-duty plastic attached to stakes all the way around the open area. Something like this https://m.lowes.com/pd/BARRICADE-10-ft-x-100-ft-Clear-6-mil-Plastic-Sheeting/1000158151
It wouldn't be airtight or look all that great but it would likely help alot vs the area being left completely open. If you were able to leave it up only during cold weather I expect you'd get a few years of use from the plastic before it started to break down from sunlight. And most heavy plastic will come pretty wide (this is 10 ft wide x 100 ft long) so unless your house is huge you won't need more than one roll---and might even get two installations from one roll depending on how you cut the strips. Good luck!
I agree with Lizbeth, definitely consider encapsulating the space under your house if it's a crawl space. I remember growing up we would use bales of hay to block the vents, but as an adult I would worry about things making a nest. It worked though.
I have a large crawl space under my kitchen. The weatherization experts told me not to fill it with insulation as there are pipes and the possibility of problems with moisture. They suggested lining the walls with wrap insulation if possible. Pipe wrapping is a good idea in particular any exposed to the weather or in an uninsulated areas. We ended up insulating any walls, kitchen ceilings and we put insulation around the walls of the crawl space.
We had our whole roof replaced with IKO Architectural shingles last week because of larger than golf ball size hail in early June. We used a highly rated contractor t...
See more
Please HELP!!! Due to dogs, the urine smell in the concrete in out basement will knock you over. It is so bad you can smell it all through out our house. What is th...
See more
If you have foundation vents you can install ones that close when it gets cold. (Mine close when it drops below 50.) Otherwise I'd concentrate more on insulation to keep the crawl space cold air from seeping into your house. And insulate your cold water pipes, of course to avoid freezing. (Insulating hot water pipes may also give you hotter water.)
I agree with Lizbeth, definitely consider encapsulating the space under your house if it's a crawl space. I remember growing up we would use bales of hay to block the vents, but as an adult I would worry about things making a nest. It worked though.
I have a large crawl space under my kitchen. The weatherization experts told me not to fill it with insulation as there are pipes and the possibility of problems with moisture. They suggested lining the walls with wrap insulation if possible. Pipe wrapping is a good idea in particular any exposed to the weather or in an uninsulated areas. We ended up insulating any walls, kitchen ceilings and we put insulation around the walls of the crawl space.