Use metal flex or fiber board ducts that are insulated to code.
Attic hvac ducts.
The first and possibly most important thing is to make a commitment to yourself to change your hvac filters regularly.
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Hvac ducts should be buried under insulation hard covered too.
Putting a furnace in an attic is not ideal but will happen.
Attic hvac systems also require shorter ducts.
When hvac ducts are installed in a vented attic in a dry climate bury the ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space.
The duct insulation should include a vapor barrier cover.
Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.
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.
Having it installed in the attic ensures that it is 100 percent protected from flooding caused by plumbing leaks and overflows.
Your hvac system will require shorter ducts.
Leaks and overflows on a given floor will seep through the floors to affect everything below it including your hvac system.
We can also upsize air ducts to get more air to the desired room in your home or building.