Insulating returns

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  #1  
Old 05-20-17, 02:34 PM
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Insulating returns

Issue #1:
I'm in southern california about half hour from the coast and have a packaged heat-pump. Are the returns in a vented crawl space required to be insulated? If they aren't and I insulate them anyway how will it effect the performance of the heat-pump?

Issue #2:
An additional return will be required to pass through a vented attic area to pull the hot air on the 3rd floor back down to be cooled. It will be made out of R-8 flex ducting. Are there any issues there?

Issue #3:
There will also be supply ducting running through the same attic area to get cooled air to the 3rd floor. Will R-8 be sufficient?

Your help is appreciated!!
 
  #2  
Old 05-20-17, 02:49 PM
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By vented...... you mean at or above the outside air temperature..... correct ?

In that case.... the return needs to be insulated.
R8 is the better insulated flexible ducting.
 
  #3  
Old 05-22-17, 09:28 AM
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Yes insulate everything that isn't in a conditioned space. Also flex can't pass through a wall (against code), must use hard pipe.
 
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Old 05-22-17, 09:42 AM
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Thank you very much guys!
 
  #5  
Old 05-23-17, 10:19 AM
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Gave up on trying to get answers to all three issues/questions. Too many differences in opinions and answers even from those who claim various codes. Decided to just insulate and be done with it and move on. "Get'er Done"!
 
 

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