It might help a bit with heating costs in the cooler months. You should install some sort of vent if you do enclose it, sealing an area is usually a bad idea.
Anytime there is dirt as the floor of a crawlspace there is mold. A sealed crawlspace with supplied conditioned air from the HVAC helps with energy use, pest control, air quality, etc...
It might help a bit with heating costs in the cooler months. You should install some sort of vent if you do enclose it, sealing an area is usually a bad idea.