They are their to reduce moisture. Moisture does not go away in the
winter. They should be open all year to prevent moisture build up and help
prevent mold and rot.

--
Joseph E. Meehan

26 + 6 = 1 It's Irish Math


"Chopper" wrote in message
link.net...
Hi,
I have 1 year old ranch style house with a crawl space instead of a
basement. The only thing down there is the furnace.

There are ventilation vents for this crawl space, and I wonder if these
should be left open or closed. Should they be open part of the year,
closed
other times?

Thanks