Help with A/C....
First of all thank you for taking the time to view this and for any help you may contribute.
I own a 2000 SF two story home in the hot and humid midwest. The house was built in 1998 and still has the original AC/Furnace unit. Recently I have noticed that the AC runs alot more often and cycles on/off alot more. I believe the AC Unit itself is functioning properly as the temp at the return is 70* , and the temp at the first duct in the basement across the evaporator is 52*. I've always understood a 15-20 degree drop is sufficient.
This is where I get confused. Nothing has changed in the house that I can think of that would affect the AC performance, and the temperatures outside have actually dropped which I would assume would make the load even easier yet it has gone from cycling maybe 1-2 max per hour on a 90* day to taking 4 hours to cool from 76 to 73 in the afternoon. Then it continues to cycle 3-4 times an hour even in the night. I never recall hearing it run at night.
I looked at the ductwork in the basement and there are definitely some leaks at the furnace trunk and ductwork that needs sealing (What should I use to do this?) But that wouldn't explain why the AC cycles so fast even after it cools down to shut off. I realize this may be impossible to diagnose over the internet but I am just looking for some ideas before I spend alot of money to call a contractor to find something I could have easily fixed myself.
If you need anymore info please feel free to ask.
Thanks in advance for all of your help.