If they are located in your attic be sure the area is properly insulated and any cracks or holes are sealed.
A c ducts in attic.
Put it in an attic full of blown insulation.
Because the average humidity level is 10 20 in phoenix.
Leaky seals in unconditioned vented attics can effectively turn an efficient 15 seer unit into a 12 meaning it s much less efficient.
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.
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.
Apply a generous amount of sealant mastic over the thermal leak.
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.
Steps to sealing attic air ducts locate the source of the thermal leaks by inspecting the ductwork while the air conditioner is running.
If you live in a consistently humid climate a dehumidifier can help keep the air around your ductwork dry.
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.
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.
Here s a short video on how.
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.
Use zip ties to secure any loose ducts to the attic floor.
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.
Installing attic insulation costs 1 700 to 2 100 and may be a good project to do at the same time.
Save money on your new air conditioner or furnace.
The remaining 2 tons of capacity is at least 1 5x oversized for the actual 1 load.
Hvac system problems can go undetected.