Family-owned · Serving Oswego, IL
Heating & Air Conditioning Services in Oswego, IL
Your home is your fortress. We protect your comfort. Oswego is one of the fastest-growing towns in the Chicago suburbs — we keep pace with it, not the other way around.
Family-owned
Built on trust. Not private equity.
Premium service
Quality workmanship you can rely on.
Honest pricing
Straightforward. No games.
Always on call
Emergency calls answered 24/7 — even Sundays.
Cooling
AC Repair, Installation & Maintenance in Oswego, IL
We service air conditioners, heat pumps, and ductless mini-splits throughout Plainfield, Naperville, and nearby suburbs. When your home stops cooling, we provide same-day diagnostics whenever availability allows.
AC Repair
$150–$600AC Installation & Replacement
From $3,800Ductless AC Installation & Mini-Splits
From $3,000/zoneAC Maintenance
$89–$150
Heating
Furnace Repair, Replacement & Heating Maintenance in Oswego, IL
Our heating services cover furnaces, heat pumps, tune-ups, and the combustion safety checks that come with burning gas indoors. For no-heat emergencies, we answer the phone 24/7.
Furnace Repair
$150–$600Furnace Installation & Replacement
From $3,500Heat Pump Repair & Installation
From $4,500Heating Maintenance & Tune-Up
$89–$150
Why local actually matters here
Local HVAC service for Oswego homes.
Oswego's population has nearly tripled since 2000 — about 13,300 residents then to roughly 35,000–40,000 now, almost entirely new construction along the Route 34 corridor. That means most AC and furnace systems out here are newer and code-current, so a service call is more often one specific part than a system that's simply worn out.
Oswego is the largest municipality entirely within Kendall County, with its own permitting office and inspector rotation — different from the Will County townships next door. Every installation and replacement gets filed with the right office the first time, whether it's a furnace or a full AC system.
The Fox River runs through the village, and homes near the floodplain run more humid through summer than the subdivisions further out — which changes how we size and set up an AC system out here, not just how we check a furnace.
What we handle in Oswego
Everything FortHouse does, available to Oswego homeowners directly — not routed through a regional dispatcher two counties over.
AC repair & AC maintenance
Same-day AC repair when the air stops running cold, and AC maintenance that accounts for the extra humidity homes near the Fox River floodplain deal with — static pressure, refrigerant charge, amp draw, not just a filter swap.
Furnace repair & heating maintenance
Furnace repair and gas furnace repair with a combustion safety check on every visit — usually one specific part, since most Oswego systems are newer and code-current after two decades of new construction along the Route 34 corridor.
HVAC installation & replacement
Full HVAC installation and replacement, filed with Kendall County's own permitting office — Oswego is the largest municipality entirely inside it — and Manual J–sized rather than matched to the old unit's label.
Ductless mini-split installation
Ductless AC installation and mini-split installation for additions and rooms a newer Oswego system's ductwork was never extended to reach.
Common questions
Oswego, IL — frequently asked.
What HVAC services does FortHouse offer in Oswego, IL?
AC repair, AC maintenance, furnace repair, heating installation, full HVAC replacement, and ductless mini-split installation — the same services listed on our services page, dispatched to whichever side of the county line you're on.
See all HVAC servicesDo you offer emergency HVAC repair in Oswego?
Yes — 24/7, including nights, weekends, and holidays. A furnace failure in January or an AC failure in a July heat wave doesn't wait for business hours.
Read more about our emergency HVAC serviceHow much does AC repair cost in Oswego, IL?
AC repair here typically costs $150–$600 depending on the part — a capacitor swap sits at the low end, a full compressor replacement much higher. Since most Oswego homes run newer, code-current systems, we're usually pricing one specific failed part rather than diagnosing a system that's simply worn out.
Read the full AC repair guideHow much does heating repair cost in Oswego, IL?
Most heating repairs also run $150–$600, whether it's an ignitor, a flame sensor, or something bigger like an inducer motor. Every visit includes a combustion safety check at no extra charge.
Read the full furnace repair guideWhat areas near Oswego do you serve?
Plainfield, Naperville, Yorkville, Bolingbrook, Wheaton, Lisle, Minooka, Shorewood, and Aurora, alongside Oswego. If you're just outside that list, call anyway — we make exceptions for a reasonable drive.
See our full service areaHow we work
You call, we diagnose with real measurements, you get a flat written number before anything starts, then we fix it and put the post-repair readings on the invoice next to the originals. See the full four-step process.
Where we work
HVAC Service Areas Near Oswego, IL
We keep the radius tight on purpose. A tech who is twenty minutes away can actually get to you the same day, and already knows how the housing stock out here is built.
Not on the list? Call and ask — we make exceptions.
We install and service
Book a visit
Tell Us What the System Is Doing
Describe the symptom and we will tell you what it usually means, what it typically costs, and the earliest available appointment. No obligation on the call.
- Weekdays
- 7:00 AM – 7:00 PM
- Saturday
- 8:00 AM – 4:00 PM
- Emergency
- 24 hours, 7 days
- Ownership
- Family-owned