I have thermostatically controlled vents on my house for the crawlspace.

I did have one left open for combustion air for my furnace, but went with
sealed combustion. Now they're all controlled.

"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