My attic wasn’t venting the way that it should. I also noticed that in some areas the insulation seemed to have settled a bit over time. This is defiantly not good for my comfort, my air conditioner, or my monthly energy bills.
The first thing I’m going to do is check the filter in my furnace. I have a 20X25X5 inch filter in it. This filter is supposed to last 6 month. I replaced it a month ago so it should be clean. Turn off your furnace before you remove your filter. I have found debris in the cold air return that would have been sucked into the blower if I hadn’t turned the furnace off first.