A snow-covered two-story shingled house at night with one illuminated upstairs window, surrounded by snow-laden trees under a dark blue sky.

HVAC Repair in Danville, IL

Homes here need heat from October through May and cooling from June through September. If your system quits, tell us what it's doing and a licensed contractor who covers Vermilion County will get in touch.

Tell us about the job

It takes about a minute.

Step 1 of 3: Equipment
An unfinished concrete basement containing a metal HVAC air handler, exposed wooden ceiling joists with sheet-metal ducts, a hanging bare bulb, copper pipes, and stacked cardboard boxes.

Danville runs its system almost year round

Your furnace works from October to May here, and on winter nights that average 21°F it can be running most of the night to hold the temperature. That many hours on the burner wears down the igniter first. When it goes, the furnace won't light at all and the house goes cold fast.

Summer flips the load onto the condenser, with afternoons averaging 84°F from June through September. That leaves only a few weeks in spring and fall when nothing is running. Vermilion County has also logged 163 damaging wind events and 7 winter storms over the past ten years, and storms like that knock out power. Most furnaces and air conditioners come back on their own once power returns, but if yours doesn't restart, that points to something else that needs a look.

8 months
October through May, your system heats
4 months
June through September, it cools
21°F
the average winter night it heats against
84°F
the average summer afternoon it cools against
Isometric illustration of a cutaway single-story house showing a gray furnace unit, connected ductwork, and a vertical flue extending above the dark shingled roof.
Your system heats October through May and cools June through September.

NOAA nClimDiv, 1991–2020 normals

A gas furnace with sheet-metal ductwork and PVC pipes installed in an unfinished basement.

A new furnace and air conditioner would cut about $150 a year off heating and cooling for a typical Vermilion County home.

  • A new furnace and AC$770 a year
  • An older furnace and AC$920 a year

Estimates for a typical Vermilion County home, compared with an older unit built to the previous federal minimum, from EIA household energy data, Illinois fuel prices and NOAA climate normals. Your home will differ.

Repair makes sense when one part has failed.

Replacement makes sense when the furnace's heat exchanger is cracked, the air conditioner's compressor has failed, or repairs keep coming.

In Illinois, HVAC licensing for homes is left to the cities and towns.

Illinois has no state HVAC license. The decision is left to each city and town, so what applies to this repair depends on where the house sits in Vermilion County, not on any statewide record. Some towns may require their own license before a contractor can do this kind of work. Others have no such rule. There is no state list of licensed HVAC contractors in Illinois either way.

For a heating and cooling repair, that means the state itself is not the thing standing behind the work. Whatever protection exists here comes from whatever the local town requires, if anything. A furnace connection that is not sealed or vented right is the dangerous part of a repair like this, and Illinois leaves the answer to who checks that to each city and town rather than setting 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 set a few degrees above room temperature, and check that it has power or a fresh battery. If the thermostat looks fine, check the breaker for the furnace, since a tripped one will cut power even if the rest of the house looks normal. Gas furnaces also need a pilot light or igniter to work, so if you hear the blower running but never feel warm air, the ignition side is worth having a contractor look at. At 21°F on a winter night, a furnace that will not start is worth calling about the same day.
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 even though the system keeps running. Check outside too, since the outdoor unit needs open airflow around it and can lose capacity if grass, mulch, or debris are packed against the coil. If the filter is clean and the outdoor unit is clear but the air still is not cold, the system may be low on refrigerant, which is a repair for a licensed contractor, not something to add on your own.
What can I check before calling for HVAC repair?
Check the thermostat first, including the batteries, the mode, and the set temperature. Then check the breaker for the furnace or air conditioner, since a tripped breaker will stop the system cold and is an easy thing to rule out. Look at the air filter next and replace it if it is visibly dirty. If the outdoor unit is not running, check that it has clear airflow around it. Telling the contractor what you already checked will help them get to the actual problem faster.