An outdoor air conditioning condenser unit on a concrete pad next to the gray vinyl siding of a residential home.

AC Maintenance in Florissant, MO

Air conditioners here run from May through September, so April is the time for a tune-up. Tell us about your system, and a licensed contractor who covers St. Louis County will get in touch.

Tell us about the job

It takes about a minute.

Step 1 of 3: Equipment

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Aerial view of a residential air conditioning condenser unit mounted on a concrete pad next to a house with vinyl siding and a sliding glass door.

Five months of Florissant summer adds up

Your air conditioner runs from May through September here, and on afternoons averaging 87°F it doesn't get much of a break. That kind of stretch puts real hours on the compressor and the fan motor, the parts that do the work of moving heat out of your house.

A tune-up catches what those hours wear down. A technician checks refrigerant charge, tests capacitors, and clears the condenser coil so it can shed heat the way it's supposed to. Storms come through here too, with hail and damaging wind on record most years, and a check after a bad one can find a bent fin or a coil packed with debris before it affects how well your system cools.

5 months: May through September, your air conditioner is on duty
87°F: the average summer afternoon it cools against
77 hail events: in ten years, and hail bends the fins on outdoor coils
108 wind events: in ten years, and wind drives debris into outdoor units

Isometric line illustration of a cutaway house showing interior rooms with ductwork, an indoor air handler, and an outdoor condenser unit connected by lines, on a white background.

Your air conditioner works hardest from June through August.

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NOAA nClimDiv, 1991–2020 normals

Overhead view of an air conditioning condenser unit on a concrete pad next to a house with asphalt shingle roofing and vinyl siding.

Book your AC tune-up in April, before homes here start needing cooling in May.

A tune-up checks the refrigerant charge, cleans the coils, tests the capacitor and tightens the electrical connections.

What does AC maintenance include?: A technician cleans the condenser coil, checks the refrigerant charge, and tests the capacitor and contactor in the outdoor unit. Inside, they check the evaporator coil and the condensate drain, since a clogged drain line is one of the most common reasons a system stops cooling. They also check the filter, the thermostat operation, and the electrical connections, then run the system to see how it's actually performing.
How often does an air conditioner need maintenance?: Once a year is enough for most systems, done in spring before the heat sets in. Homes here run the AC from May through September, so getting the checkup done before that stretch starts means the coil and refrigerant charge are already right when the system has to work hardest. Skipping a year doesn't ruin a system, but problems like a low charge or a dirty coil tend to get worse quietly until a hot afternoon exposes them.
Is AC maintenance worth it?: Yes, because most of what causes a system to fail midsummer is something a technician can catch beforehand. A dirty coil, a weak capacitor, or a low refrigerant charge all make the unit work harder without cooling as well, and they tend to show up as a full breakdown on one of the afternoons here that hits 87°F. Maintenance also gives someone a yearly reason to look at the outdoor unit for storm damage, which matters here given how often hail and high wind come through.

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