Full System Replacement in Wilmette, Illinois
Full System Replacement in Wilmette typically costs $9,000-$18,000 installed in 2026, depending on home size and efficiency tier.
Full-system replacement is the heart of the work in Wilmette's forced-air neighborhoods. Homes here typically added central air to an existing furnace decades ago, and when both units reach the 12-to-15-year mark together, replacing them as one matched system is more efficient - and cheaper over time - than tackling them one at a time.
| Smaller homes (under 1,500 sq ft) | $7,700-$15,800 |
| Typical homes (1,500-2,500 sq ft) | $9,000-$18,000 |
| Larger homes (2,500-4,000+ sq ft) | $10,100-$23,800 |
Final pricing depends on system size, efficiency, and home configuration. Every quote is written and itemized after a free in-home estimate, with available utility rebates factored in. See current North Shore rebates or get an instant ballpark estimate.
Full System Replacement for Wilmette homes
A matched furnace and AC in a Wilmette home share a correctly sized coil and are tuned to operate as a unit, which is where the real efficiency and even comfort come from. We run a Manual J load calculation on the actual house, because many Wilmette homes have been insulated and re-windowed since the original system went in and no longer need the tonnage they were built with. Right-sizing both units together prevents the short-cycling and humidity problems that mismatched or oversized equipment causes.
Doing both in one visit means a single day of disruption and one installation cost instead of two. The install crew sets the furnace and condenser, matches the coil, runs venting and condensate, verifies the line set and electrical, and confirms safe combustion and proper charge before leaving. They remove both old units, and register the warranties, and we hand off the stacked Nicor and ComEd rebate paperwork the matched system qualifies for.
When Wilmette homeowners call us for this
- System is 15+ years old or out of warranty
- A repair would cost a large share of a new unit
- Rising energy bills or uneven comfort
- Repeated breakdowns in a single season
- Phased-out refrigerant (older R-22 AC)
- Planning ahead before a full failure
Why Wilmette homes need replacement planning
Wilmette mixes century-old lakefront homes with solid mid-century construction, so replacement projects range from boiler and radiator systems in the older east side to furnace-and-AC changeouts in postwar homes further west. Many homes added central air decades ago and are now on their second or third system.
Talk it through - (847) 752-4418Neighborhoods we cover in Wilmette
Our process
- 1Free in-home estimate
A comfort specialist comes to your Wilmette home, measures the space, checks ductwork and venting, and explains options and honest price ranges in writing - no charge, no pressure.
- 2Right-sized equipment
We size the system with a proper load calculation and choose efficiency levels that qualify for the utility rebates you're eligible for.
- 3Professional installation
Licensed, insured installers remove the old system and install the new one to spec.
- 4Rebates, registration & follow-up
We register the warranty, hand off the utility rebate paperwork, and confirm everything is running right.
Frequently asked - Full System Replacement in Wilmette
How much does full system replacement cost in Wilmette?
Full System Replacement in Wilmette typically runs $9,000-$18,000 installed, depending on system size, efficiency, and how the home is configured. We provide a written, itemized estimate from a free in-home visit for every Wilmette project - and factor in the utility rebates you qualify for.
Do you serve all of Wilmette?
Yes. We cover every neighborhood in Wilmette, including East Wilmette, West Wilmette, Kenilworth Gardens, Indian Hill Estates and surrounding areas.
Are you available 24/7 for emergencies in Wilmette?
Yes. We run a 24/7 line across Wilmette for no-heat and no-cool emergencies and can prioritize dispatch.
What kinds of systems do you commonly replace in Wilmette?
In Wilmette we regularly work with Hot-water boilers, 1950s-60s forced-air furnaces, Retrofit central AC, Steam radiators, Aging split systems. We match the approach to the home's age, ductwork, and venting.
Full System Replacement guides
Looking for the full picture on Full System Replacement or everything we do in Wilmette? Explore those pages, or call (847) 752-4418 for a free estimate today.