DO YOU KNOW YOUR FURNACE?
It's a pretty safe bet that the vast majority of furnaces & air conditioners are oversized.
There a lot of factors to know for sure if your AC and Furnace are sized proper.
The technical term for the process to determine called Load Calc or Manual J and both are relatively simple to understand but more complicated to actually perform. Require knowledge of building science and today, there are a few approved software programs that can do much of the calculations once one knows some basics of the home.
Over sized equipment can shorten life of both furnace and air conditioner as well as create comfort issues.
I plan to go into more detail with other articles to follow.