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Old 02-20-2013, 08:24 AM   #1
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Crawl space .. add a duct?

Hi and thanks in advace.

Here is our problem.
We are in a 2 story (2600 sf) home here in Newport Beach, CA where the weather is typically mild ... Half the home is over a crawl space (other half on garage slab) that is always freezing... which in turn keeps the wood floors cold, etc. as I think the crawl space temp is coming up into the house. There is no insulation in the joists above the crawl space as well..

The lower level of the home is approx 900 sf (not including garage) that includes 2 small bedrooms, laundry, bath and a 13x16 tv room.

We have 2 furnaces in the home (no AC) and the bottom one seems overkill as the bedrooms are always hot compared to the rest of the level.

My question is could I add a duct to the bedroom duct run that empties into the crawl space to give it some heat?

This seems like it would solve my problem of the overheated bedrooms and warm the space below the house which, in turn, would keep the temp a bit more constant on the first floor ..

Dont know if it is even legal to do this but thought I would ask.

Thanks again.


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Old 02-20-2013, 10:22 AM   #2
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Originally Posted by beachfront71 View Post
Newport Beach, CA where the weather is typically mild ...
There is no insulation in the joists above the crawl space...
Half the home is over a crawl space that is always freezing...
Right. I used to live there. Climate data: LINK

Since we KNOW this "freezing" stuff is hyperbole...
how about getting some actual temperatures recorded?

Know and show what the variance is between the outside air temp
(rarely ever below 48F) and what the crawl space temps are.

Then explore what sort of ventilation you have down there (or not)...
along with ground cover and insulation.



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Old 02-20-2013, 05:53 PM   #3
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Is the crawlspace sealed? Or vented? How much insulation is in the joist spaces in the crawlspace. After you seal it if its not already sealed, and insulate the crawlspace walls. You can run a supply and a return. Can't run just a supply, as that would depressurize the lower level, and could draw in fumes from the garage.
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