The ideal time for air conditioner maintenance is spring, before the first hot week. Plenty of people miss that window. Spring gets busy, the system seems fine, and suddenly it's August. So is it too late? No. A late-season visit still catches the problems that cause breakdowns, and some of them are easier to spot after a full summer of running.
What a summer of running does to an AC
By the end of a Cincinnati summer, your system has logged long hours in heat and humidity. That takes a toll on specific parts:
- Capacitors. The run capacitor helps start and run the compressor and outdoor fan motor. Heat breaks it down over time. A technician tests capacitance against the rating on the label, and a weak one can be replaced before it takes a motor or compressor down with it. A swollen or leaking capacitor is a clear sign.
- Contactors. The contactor is the switch that sends power to the outdoor unit. Every cycle arcs a little across the contacts. Pitted or burned contacts can chatter, overheat or stick closed.
- The condenser coil. Cottonwood fluff, grass clippings, pollen and dirt pack into the outdoor coil fins. A dirty coil can't get rid of heat, which raises pressures, makes the compressor work harder and shortens its life.
- The condensate drain. All the moisture your AC pulled out of the air went down this line. Algae and sludge build up, and a clogged drain can overflow into a ceiling or basement, or trip a float switch and shut the system off.
- Refrigerant charge. A system shouldn't lose refrigerant. If it's low, there is a leak. Oily residue on line set joints or on the coil is often the clue. A technician checks charge by measuring superheat or subcooling, not by guessing.
Fall is a good time, especially for heat pumps
If you have a heat pump, the outdoor unit doesn't get the winter off. It heats your home all season, so a fall visit is pre-season maintenance, not post-season. The technician checks the same electrical parts and coil, plus the reversing valve, the defrost controls and the auxiliary heat strips.
For a straight air conditioner, an end-of-season check means problems found in October get fixed on your schedule, not on the first 90-degree day next June when every contractor in town is booked.
One limit worth knowing: refrigerant charge is most accurate to check when it's warm enough outside for the system to run under a normal load. On a cold day a technician can still clean, inspect and test electrical parts, but a full charge check may need to wait for warmer weather.
What you can do in between
Some upkeep is fair game for a homeowner:
- Change the filter on schedule. If the filter slot is near the blower, shut off power at the switch or breaker first.
- Keep plants, mulch and debris back from the outdoor unit so air can move freely.
- With power off at the outdoor disconnect, rinse dirt off the outside of the condenser coil with a garden hose on a gentle setting. Never use a pressure washer on the fins.
- Check that the condensate line is draining when the system runs.
Leave refrigerant, electrical components and anything behind the outdoor unit's panels to a technician. Refrigerant work takes special equipment and training, and a capacitor can hold a charge even with the power off.
Whether it's July or October, it's not too late. Call JM Mechanical at (513) 667-8484 or request service online to schedule an AC or heat pump checkup.