Attic Vs Crawl Space

It s easy to see your point about eliminating ductwork from the attic. I vote for the attic. For homes with eight foot ceilings you can get special roof trusses called plenum trusses that are designed to accommodate ductwork and create a chase in the attic floor.

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The attic would be fine if the equipment and duct work were installed in conditioned space.

Attic vs crawl space.

Seal supply boxes with mastic. If you have vaulted ceiling then you will need to install some registers near the ceiling on one of the walls. If it applies to energy auditors and raters too that could really be difficult because many times they go into a house on their own. However i have two questions if i want to centrally air condition my entire house.

Knowing the disadvantages of attic install and the crawl space install. An attic crawl space is an area on the top level of a house that is not tall enough to be used as a living area and is often unfinished. So when we have a choice we prefer hvac systems located under the house. In a crawlspace you have to worry about critters and duct losses.

If there were a way to eliminate the possibility of critters i would prefer the cooler location for ducts. This is a big deal and has the potential to add significant cost to air sealing insulating crawl space encapsulation and all those things we do in confined spaces. With new construction i would look for a way to have them in conditioned space. As a great deal of heat can escape through the attic of a house it is common for this area to be insulated.

O is air conditioning the 1st floor effective with floor venting if i run ductwork in the basement. Rarely will a sealed foam insulated attic deviate more than 15 degrees from the living space temperatures below it. You can expand it just enough to accommodate the ducts. My vote would be the crawl space if there is sufficient room and easy access for service.

Compare that with the daily 140 degree temperatures found in vented attics. Insulate and air seal the floor with open cell foam put ductwork and mechanicals in the attic install a radiant barrier and mastic seal the ducts. Expanding the conditioned space doesn t require you to condition an entire attic or crawl space. In the attic you have worry about heat gain and duct losses.

Strap ducts out of insulation with 3 ductstraps per specifications. A two room addition on the 1st floor has limited attic space and a 4 crawl space.

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