AC Breaks on Hot Days? Here's Why and How to Stop It

Derek Cole explains why air conditioners fail on the hottest days: mild weather masks problems until temperatures exceed 90°F, when weak capacitors, dirty coils, and low refrigerant can't handle the load. Watch for rooms that won't cool, high humidity, longer runtimes, and unusual noises. Maintenance before summer heat arrives prevents costly emergency repairs.
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Have you ever noticed your air conditioner seems to work fine all during the fall, during the winter, during the spring, but then that first 90-degree day comes and suddenly it quits? Well, it happens all the time, and there's a good reason for it happening. See, the first 90-degree day is a real stress test for your air conditioning system. During the spring, your system only runs for short periods of time. It doesn't have to work very hard. If there's a dirty coil or low refrigerant, a weak capacitor, or a clogged drain line, the system may still appear to be working even though it's starting to fail. But once the temperature hits the 90s, everything changes. Your air conditioner has to run longer, has to remove more heat from the home, and if it's weak in any part of the system, the extra strain is often enough to cause it to fail. That's why you hear from so many homeowners the same story: it worked fine yesterday. Well, yesterday it was 78 degrees, today is 92 degrees— completely different story. Yesterday was mild, today is hot. The system is finally being pushed to do what it is designed to do. Some of the most common factors we find are weak capacitors, dirty outdoor coils, restricted airflow, low refrigerant, and failing electrical components. See, the main job of the system is to remove heat from the home. The good news is it can be caught. These items can be often caught before it gets to that point. Watch for the early warning signs, things like grivance, rooms not cooling properly, high humidity, longer runtimes, higher electric bills, different noises, water around the unit. All these are signs that your system may not be ready for summer. The worst time to discover this problem is when you're in the summer, when you're in it versus preparing for it. When you're reacting versus being proactive and checking your system to make sure it's ready for what is a marathon of the summer. We are headed for more hot weather. The system is going to run a marathon. It needs to have all these components working effectively to properly cool the home. It needs to breathe. You need to change that air filter at home on the first big heat wave is a problem because schedules fill up quickly, wait times get longer. Homeowners are forced to make stressful decisions for— with the conditions presented versus having time to make a decision. In the middle of the summer, you don't have time. You want to be comfortable, you want to be cool, you want to be cooled off. Things are rushed, schedules are tight, timelines shrink. You don't want to be in that situation where the weather makes the decision for you. If your air conditioner has not been inspected this year, do not assume it's ready. Do not assume you're going to have a cool summer without it being checked out. Now is the time to get that tune-up, get that pro out there Get it checked out to make sure you can handle the heat that's coming for months, and the system is going to have to work harder. Can it make it through the marathon? Take care of it now. Head into summer with confidence and knowing your home will stay cool and comfortable all summer long, the time in which you need it the most.
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