AC Maintenance in O'Fallon, 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. Charles County will get in touch.
Tell us about the job
It takes about a minute.
Five months of heat, every year
Your air conditioner works hardest from May through September here, with summer afternoons averaging 87°F. That is five straight months where the compressor runs long hours just to keep up, day after day.
St. Charles County also sees its share of rough weather. Ten years of records show 39 hail events and 84 damaging wind events in the area, with hail up to 4 inches recorded. A condenser sits outside through all of it, and a coil or fan blade can take damage that is not obvious until the unit is struggling on a hot afternoon. A tune-up checks the coil, the refrigerant charge, and the electrical connections before the next stretch of 87-degree days asks everything of them.
- 5 months
- May through September, your air conditioner is on duty
- 87°F
- the average summer afternoon it cools against
- 39 hail events
- in ten years, and hail bends the fins on outdoor coils
- 84 wind events
- in ten years, and wind drives debris into outdoor units
NOAA nClimDiv, 1991–2020 normals
Book your AC tune-up in April, before homes here start needing cooling in May.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
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 checks the refrigerant level, cleans the condenser coil, tests the capacitor, and inspects the electrical connections. They also check the thermostat calibration and confirm the blower and outdoor fan are running the way they should. Cleaning the coil matters here, since hail and wind can leave debris against the outdoor unit that blocks airflow over time.
- How often does an air conditioner need maintenance?
- Once a year, before it has to run hard. Homes here need cooling from May through September, so having it checked in spring means it's ready before the 87°F afternoons hit. A yearly check catches a weak capacitor or low refrigerant before it turns into a breakdown in the middle of summer.
- Is AC maintenance worth it?
- Yes, because most AC breakdowns trace back to something a checkup would have caught. A dirty coil or a failing capacitor does not announce itself, it just makes the system work harder until it stops. With five months of cooling season here and summer afternoons averaging 87°F, a unit that is already strained has no room left to fail quietly.