AC Installation in Oswego, IL
A new air conditioner in Oswego will run 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.
Three months of real heat, and hail that gets tested first
Oswego gets three months of cooling weather, June through August, with summer afternoons averaging 83°F. That is a short season, but a hard one, and a new system still has to be sized and installed to handle it well, not just survive it.
Kendall County has seen 34 hail events and 70 damaging wind events over the past ten years, with hail as large as 4.75 inches. The outdoor unit sits outside through all of that, so how it is installed and protected matters as much as the equipment itself. Any new central air conditioner installed today also has to meet the federal efficiency minimum of 13.4 SEER2.
- 3 months
- June through August, your air conditioner is on duty
- 83°F
- the average summer afternoon it cools against
- 34 hail events
- in ten years, and hail bends the fins on outdoor coils
- 13.4 SEER2
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
Going above the federal minimum saves little here, about $20 a year.
Estimates for a typical Kendall County home, from EIA household energy data, Illinois fuel prices and NOAA climate normals. Your home will differ.
In Illinois, HVAC licensing for homes is left to the cities and towns.
Whether a contractor needs a local license for this job depends on the city or township where the house sits, since Illinois leaves that decision to each one and never built a state license behind it. Some places require it. Others do not. There is no state record either way, because the state does not license HVAC contractors at all.
What applies to this job in most places is the permit. In most cities and counties, installing a new air conditioner calls for a permit from the local building office, with an inspection once the work is done. That inspection is what checks the installation, not a license number.
Source: Illinois General Assembly
- What size air conditioner does my house need?
- There is no single number that fits every house. Sizing depends on your square footage, how much insulation you have, how many windows face the sun, and the layout of your ductwork. An oversized unit cools the air fast but shuts off before it pulls the moisture out, leaving the house feeling clammy. An undersized one runs constantly and still cant keep up on the hottest days. A contractor works this out with a load calculation, not a guess based on the old unit's size.
- Should I replace the whole system or just the outdoor unit?
- If your outdoor unit is original to the house and the indoor coil is old too, replacing just the condenser usually causes problems. The two are matched to work together, and pairing a new outdoor unit with an old indoor coil can hurt efficiency and shorten the life of the new equipment. New systems installed since 2023 also have to meet a 13.4 SEER2 minimum, and an old coil was not built to that standard. A contractor can check whether your indoor coil and ductwork are in shape to pair with new outdoor equipment, or whether the whole system needs to come out together.
- Do HVAC contractors in Oswego need a state license to work on my home?
- Illinois does not license HVAC contractors at the state level. That is left to individual cities and towns, so check whether Oswego itself requires a license before hiring someone.