Seal supply boxes with mastic.
Hvac in crawl space vs attic.
A two room addition on the 1st floor has limited attic space and a 4 crawl space.
The hvac s air pickup is in the crawl space and it spreads the radon laden air into the house.
Well mainly it s a way to save space.
Attic hvac systems save space.
The space is taken up by plumbing hvac and electrical wiring.
However i have two questions if i want to centrally air condition my entire house.
So when we have a choice we prefer hvac systems located under the house.
That means having it placed in the attic or a crawl space is a bad idea because you are increasing the risk of causing damage to the equipment.
An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan.
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.
Rarely will a sealed foam insulated attic deviate more than 15 degrees from the living space temperatures below it.
Knowing the disadvantages of attic install and the crawl space install.
If you have ductwork in your crawl space the temperature of the duct will be the same as the temperature of the.
If your attic is finished and the hvac system is in excellent condition you might be able to avoid this disadvantage but most houses do not have an attic that is suitable for full time living.
Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts.
This means that like an attic or unfinished basement you don t heat and cool it.
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It s easy to see your point about eliminating ductwork from the attic.
So why put an hvac system up in the attic at all.
Compare that with the daily 140 degree temperatures found in vented attics.
The crawl space is an unconditioned space.
Place 40 ft drainage pipe with holes across center floor of dirt crawl space attach this to duct line to attic space with an inline 90 cfm silent exhaust fan at the other end of attic run a 6 in.
Strap ducts out of insulation with 3 ductstraps per specifications.
O is air conditioning the 1st floor effective with floor venting if i run ductwork in the basement.
If you use duct board flex in crawl space you will have problems.
Some things to consider about attic vs.
If the crawl space does not have proper ventilation radon concentrates in the trapped air inside the crawl space.
I vote for the attic.
Duct through corner of closet from attic back to crawl to circulate dry attic air and close the foundation vents.
There s usually nothing up in an attic aside from some stored items so a furnace won t take up useful space.
Animals love duct board flex 09 06 2007 02 11 pm 12.
The problem with uninsulated ductwork.
