HVAC Installation in Oswego, IL
A new system here will heat from October through May and cool from June through August every year. Tell us about the house, and a licensed contractor who covers Kendall County will get in touch.
Tell us about the job
It takes about a minute.
Eleven months of work a year in Kendall County
Your new system needs to hold up from October through May, then cool the house through June through August. Winter nights average 19°F here, cold enough that a furnace sized wrong will run long and hard to keep up. Summer afternoons average 83°F, so the cooling side has real work too, just a shorter stretch of it.
Most homes in this area heat with gas, and whatever you install has to meet the federal efficiency minimum for that equipment. Power is worth planning around too. Statewide, 16 percent of households went at least a day without power in 2024, and this area has logged 10 winter storms and 70 damaging wind events over the past ten years. A furnace with a standing pilot keeps working through an outage. One with electronic ignition does not, and a central air conditioner needs power no matter what.
- 8 months
- October through May, your system heats
- 3 months
- June through August, it cools
- 19°F
- the average winter night it heats against
- 83°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.
Kendall County has no HVAC licensing office of its own, and Illinois does not license HVAC contractors at the state level either. Whether any local credential is required comes down to the specific city or township the house sits in, since some require it and others do not. There is no statewide record to check either way.
What does apply here is the permit process. Installing a new furnace or air conditioner in most cities and counties means pulling a permit from the local building office and having the work inspected once it is done. That inspection is what confirms the gas line, the flue and the wiring were done right, since a bad connection is the dangerous part of this job.
Source: Illinois General Assembly
- When should I replace my HVAC system?
- Once a repair costs a real share of what a new system runs, or you're calling for service more than once a season, it's time to start looking. How well the system has been maintained matters as much as its age. Here, your furnace has to run from October through May, so a failure in the middle of that stretch is a bigger problem than one in summer. If a contractor tells you the heat exchanger or the compressor is failing, that's usually the point where replacing makes more sense than repairing again.
- Should I replace my furnace and air conditioner at the same time?
- If both are getting old, replacing them together is worth asking a contractor about, since a furnace and air conditioner installed at different times can end up mismatched in how they perform together. It's not required. Plenty of homes run a newer furnace with an older air conditioner or the other way around. But if your furnace is failing and your air conditioner is close behind it, doing both now means one installation instead of two, and a system that was sized and matched as a pair from the start.
- What happens during an HVAC installation?
- A contractor removes the old equipment, sets the new furnace, air conditioner or both in place, and connects it to your ductwork, gas line, electrical and, for central air, the refrigerant lines. Then comes testing. A contractor checks gas pressure or refrigerant charge, confirms the thermostat talks to the new system, and makes sure air is actually moving through every vent in the house. Most installations are done in a day, though a job that also involves duct work or electrical upgrades can take longer. Check whether your city requires a permit or inspection for the work, since Illinois leaves HVAC licensing to individual cities and towns rather than the state.