HVAC Repair in Marion, IL
Homes here need heat from October through April and cooling from May through September. If your system quits, tell us what it's doing and a licensed contractor who covers Williamson County will get in touch.
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Marion runs its system almost year round
Heat runs October through April here, then cooling takes over for the five months after. That is most of the year asking a furnace or an AC to start up and hold steady. Winter nights averaging 27°F mean long, frequent burner cycles, and each one puts a little more wear on the igniter. Summer afternoons near 87°F push the compressor hard for hours at a stretch, which is where a weak capacitor or a low refrigerant charge tends to show up first.
Most homes here heat with electricity, so a power outage means no heat at all, not just a quieter furnace. Williamson County has seen 14 winter storms and 88 damaging wind events over the past ten years, and statewide, 16% of households lost power for a full day or more in 2024. When the power drops in the cold, pipes and comfort both depend on how fast it comes back.
- 7 months
- October through April, your system heats
- 5 months
- May through September, it cools
- 27°F
- the average winter night it heats against
- 87°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
In Illinois, HVAC licensing for homes is left to the cities and towns.
Williamson County sets its own rule for this work, since Illinois leaves HVAC licensing to cities and towns rather than the state. There is no state exam and no state record of who is qualified. Whatever license or registration applies here, if any, comes from the local building office, not from Springfield.
On a repair job, gas lines and venting are the part where a mistake has real consequences, and it is the local building office, where one exists, that would inspect that kind of work. Whether that inspection happens at all depends on the town, because Illinois has not set one rule for the whole state.
Source: Illinois General Assembly
- Why is my heat not working?
- Start with the thermostat. Make sure it is set to heat and the temperature is set above room temperature, since a setting bumped during cleaning is a common cause. Check your breaker panel next, since a tripped breaker will shut the furnace down completely. If the thermostat has batteries, swap them. If power and settings check out and the furnace still will not fire, the igniter or a safety switch is likely the problem, and that needs a contractor to diagnose. With winter nights here averaging 27°F, do not wait long to get it looked at.
- Why is my system running but not cooling the house?
- The first thing to check is the air filter. A filter clogged with dust blocks airflow across the coil, and when that happens the coil can ice over and stop cooling the air at all. Check your outdoor unit too. If the coil or fins are packed with grass clippings or debris, the system cannot shed heat properly. If the filter is clean and the outdoor unit is clear but the air coming from your vents is not cold, the system is likely low on refrigerant or has a failing part, and that calls for a contractor with gauges to find out which.
- What can I check before calling for HVAC repair?
- Check the thermostat first. Confirm it is set to heat or cool as needed, the temperature setting makes sense, and the batteries are not dead. Check the breaker panel for anything tripped, and check the air filter, since a filter clogged with dust or pet hair chokes off airflow and can shut a system down or freeze the coil. If the outdoor unit has vents or a hood, make sure nothing is blocking it. If everything there looks fine and the system still is not working right, that points to something inside the unit that needs a contractor to open it up and look.