Coming home to an 85-degree house is extraordinarily frustrating, especially when you actually have (and use) AC.
Here's what to know
In a thread on Reddit's r/HVACAdvice, the original poster said, "Just came home to an 85 degree house with my unit not working and just humming," and noted that the earliest company they contacted couldn't make it out for another six days.
The OP then asked, "Just wondering if there is anything I can at least try even if it's a 1 in a million chance to work. Thanks."
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Several replies centered on a "failed run capacitor." One wrote, "sounds like capacitor is no good." Others immediately jumped in to agree. Another added, "This is it. The run capacitor is the culprit. $20 at Amazon depending on the brand and fully installable by yourself if you are even a slight bit handy."
The OP later gave several updates on the situation. The first explained that they "got a lead on a guy who does [HVAC] on the side." In the second update, OP confirmed that "most of you were right. It was the capacitor. He changed that out and cleaned the dirty coils. Cost me $200."
So, this story is a clear example that an outdoor unit that hums but does not start is not necessarily a sign that the whole system is finished. Of course, Internet comments do not replace a licensed technician, but they can help people recognize a common failure and avoid assuming the worst right away.
Where can I learn more?
These stories look at AC breakdowns, maintenance, and repair quotes.
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