With certain builders this was a common method back in the 70 s they used internally lined fiberboard duct and then enclosed it in a chase with drywall.
Air ducts in attic or crawl space.
In the winter a crawl space can be significantly colder than the living spaces of your home.
The hot air leaves your furnace at the desired temperature.
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If you have central heating and or air conditioning in your home the warm or cool air is delivered to each room through a system of connected ducts and vents.
Knowing the disadvantages of attic install and the crawl space install.
Strap ducts out of insulation with 3 ductstraps per specifications.
If you have ductwork in your crawl space the temperature of the duct will be the same as the temperature of the crawl space.
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.
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First note that.
Now your sealed and insulated attic and your hvac duct system is protected from extreme temperatures like your crawlspace or basement.
The crawl space is an unconditioned space.
If you live in a particularly humid area of the country then consideration should be taken into purchasing a dehumidifier for your attic or crawl space.
I vote for the attic.
See the article i linked to for more details.
Iii special trusses that create space below the unconditioned attic.
Your local air duct attic crawl space services company.
Ii lowered ceilings in hallways.
The outside air that.
You can get the air handler and ducts into conditioned space in several ways without needing a basement or crawl space.
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.
Vent the crawl space to the outside.
They have a collection reservoir and you can either empty their water bucket every few days or add a drain to them that runs outside.
This means the ducts must be inside the structure and enclosed by drywall.
If you encapsulate the crawl space adding a little bit of air from the hvac system.
This means that like an attic or unfinished basement you don t heat and cool it.
Supply air from the hvac system.
You stated the townhouse has no attic crawl space or basement.
The air ducts for a central hvac systems are typically located above a home in the attic or upper crawl space or underneath a home in the space between the foundation and the floor so you don t see them unless you have cause to replace them.
While the attic install isn t ideal it beats the problems that come with ducts.
And you win big time.
Exhaust air to the outside.
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Whether it s a matter of mice in crawl spaces air ducts or even live or dead mice in walls glue trays snap traps and ultrasonic pest control units can help.
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Do this in a humid climate and you re asking for trouble.
Iv conditioned attic and more.
