Ducts In Attic Or Crawl Space

I lowered soffits around room perimeters.

Ducts in attic or crawl space.

Seal supply boxes with mastic. Now your sealed and insulated attic and your hvac duct system is protected from extreme temperatures like your crawlspace or basement. As don peek says in the comments below it may be more cost effective in existing homes to seal and insulate the ducts as well as you can. See the article i linked to for more details.

If the ducts are in an unconditioned attic you can put spray foam insulation on the roof deck. Ii lowered ceilings in hallways. Knowing the disadvantages of attic install and the crawl space install. And you win big time.

You can get the air handler and ducts into conditioned space in several ways without needing a basement or crawl space. Strap ducts out of insulation with 3 ductstraps per specifications. I vote for the attic. While the attic install isn t ideal it beats the problems that come with ducts.

If the ducts are in an unconditioned crawl space you can encapsulate. This means that like an attic or unfinished basement you don t heat and cool it. Iv conditioned attic and more. The hot air leaves your furnace at the desired temperature.

In the winter a crawl space can be significantly colder than the living spaces of your home. 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. Iii special trusses that create space below the unconditioned attic. That same ac system that could never cool your bedrooms now with a sealed and insulated attic is providing supply airflow temperatures on par with the same unit located under a house.

The crawl space is an unconditioned space. If you have ductwork in your crawl space the temperature of the duct will be the same as the temperature of the crawl space.