Here in central Oh Hah it's been in the 80s/90s outside plus humidity, and our A/C is having trouble keeping up. It's slightly cooling the house (single story ranch with a crawlspace) relative to how it feels outside, but not by all that much, and during the day the house basically never gets down to the 73 degrees we program it for. (The inside thermometer on the thermostat usually reads between 80 and 83; I have no idea if that's accurate, but it feels not-cool-enough inside, anyway.) The fan in the outside unit seems to be working, and air is moving through the furnace. I changed the air filter recently. In other words, at first glance nothing seems to be broken. And like I said, the system works, it's just weak. So what's the problem? What can I do about it? I haven't gone down into the crawlspace to check if any ducts have come loose, so I'll have to try that. Any other ideas besides that? Or are my expectations of my A/C system just too high?