Why is my AC not cooling? What owners ask online — answered
Short answer: the same handful of causes come up every time owners ask this question on forums and Q&A boards — a dirty filter, a frozen coil, a failed capacitor, low refrigerant from a leak, a tripped breaker, or a thermostat problem. Here is our honest answer from running diagnostics across SWFL, plus what each fix tends to involve.
The causes, in the order we check them
- Filter and airflow. A clogged filter ices the coil and airflow collapses. Cheapest fix in the list — check it first.
- Capacitor or contactor. The unit hums but the fan or compressor won't start. Small part, same-day fix.
- Frozen coil. Turn it off and let it thaw; if it refreezes, the cause is airflow or refrigerant — not the ice itself.
- Refrigerant leak. Low charge means a leak somewhere; "topping up" without fixing the leak is money out the window.
- Breaker/float safety. Tripped breakers and full drain floats stop the system on purpose — find out why.
What the online threads get right (and wrong)
Owner forums and Q&A boards consistently converge on the filter-and-capacitor advice — and that is genuinely correct most of the time. Where we differ from forum wisdom: refrigerant top-ups without leak repair, and "run it colder to force it" tips that stress a struggling system. We can't quote Reddit threads here, but the pattern across public HVAC Q&A matches our own service data.
What our diagnostics show in SWFL
Our $129 diagnostic measures capacitors, pressures, temperature split, amp draw and drain — the numbers decide. Coastal salt air and year-long runtimes make SWFL systems age faster than the national averages quoted on forums.
FAQ
Can I fix a not-cooling AC myself?
Filter, breaker and thermostat batteries — yes. Refrigerant, capacitors and anything electrical: licensed technicians only (Florida law).
How fast can a tech get here?
The 24/7 line is (239) 810-9080; same-day is the norm for common parts, which are on the truck.