Because the average humidity level is 10 20 in phoenix.
A c ducts in attic.
Use zip ties to secure any loose ducts to the attic floor.
Comparing this configuration to a solar water heater they make the case that putting air conditioning ducts in a hot attic is an effective way to heat up the conditioned air as it travels from the air handler to the conditioned space inside the home.
Attics and heat the condenser in your air conditioner works hard to get rid of heat and pressurize refrigerant for the return trip through your house.
So if you see unusual water staining on any of the ceilings in your home and the roofer has eliminated roof leaks it is likely coming from some fault with the duct system in your home.
If they are located in your attic be sure the area is properly insulated and any cracks or holes are sealed.
If you live in a consistently humid climate a dehumidifier can help keep the air around your ductwork dry.
Ductwork located in an attic must be hung properly so that the insulation can do its job.
Here s a short video on how.
Installing attic insulation costs 1 700 to 2 100 and may be a good project to do at the same time.
However an attic in pensacola florida is likely to have a humidity level closer to 100 and the risk of condensation on ductwork would then go up quite a bit.
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.
In more cases than not a 3 ton ac with the ducts in the attic has a ton or so of load that s just from the location of the ducts in the attic and the associated duct gains leakage etc.
The price to replace ductwork in an attic ranges from 500 to 2 000 depending on the size of the home and your existing system.
If ducts are located in a crawlspace underneath your house cover the soil to reduce moisture.
The remaining 2 tons of capacity is at least 1 5x oversized for the actual 1 load.
Save money on your new air conditioner or furnace.
Apply a generous amount of sealant mastic over the thermal leak.
Steps to sealing attic air ducts locate the source of the thermal leaks by inspecting the ductwork while the air conditioner is running.
In it the authors argue that attic ducts kill home efficiency they say that studies show a 20 percent energy use increase for homes with attic ducted units.