Derek Cole breaks down why your AC isn't working: check the unit itself, your ductwork for holes or sagging, and your insulation for gaps. Use an infrared thermometer to find hot spots in the attic, and call a pro if those two check out.
That was a long answer. Does that make sense though? People want to think that if they're having a cooling problem or heating problem, it's just the unit, where it could be the duct system, it could be the house, the envelope, it could be all three having problems, or it could be just one of those three having a challenge. But one of those three being off is going to cause you not to be comfortable. Hopefully you lived here for a few summers, or at least one summer before, and not had this problem. So if it's If it's a brand new problem, it's either probably the duct system or the unit. If it's something that's always happened, then I will look at all 3. Get someone to check your unit. You can yourself look at the duct system, just to randomly look at it, make sure no runs have fallen down, there's no big gaping holes where an animal or something got tore up there or the pest control guy did something. You can look at all that yourself. And then third, the envelope, the home itself. Make sure you have insulation in all spots, because what we've seen happen too is like an attic, you know, it'll be— we'll take an infrared gun and we'll shoot the temperature and it'll be 75, 75, 80, 80, 80, 80, 102. You're like, okay, well, I need some insulation over here. That's why it's so hot. So Check those 3 things. Um, if it's not the duct system, if it's not the home or the envelope, then it's the unit.
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