With hundreds of square feet of ductwork surface area in the attic and a δt of 75 f the air coming out of the vents in your home will be significantly higher than 55 f.
Air ducts in attic problems.
Throw duct leakage into the mix and the problems are even worse.
According to the national comfort institute the average duct system in u s.
The last usual cause for condensation on a duct system is if the ducts are not properly hung or they are touching each other.
An attic can get up to about 130 f in the summer and the conditioned air entering the ducts is about 55 f or so.
Problems with air ducts can often be difficult to identify and repair depending on the location of the problem.
A proper repair can often make a big difference in comfort and efficiency so it is always worth the expense of paying a professional to keep your hvac system in top shape.
Ductwork located in an attic must be hung properly so that the insulation can do its job.
According to nrel researchers david roberts and jon winkler moving the ducts from a vented attic to a new location inside the conditioned space will reduce electricity used for cooling by 15 to 20 and will reduce the size of the needed air conditioning equipment by 0 5 to 1 ton.
Signs of leaky air ducts include.
When ductwork is touching it forms a very cold spot where they are touching thus condensation begins.
Improperly designed duct system.