Price per unit
US average
$8,000–$16,000
In Illinois
$8,100–$16,200
for a complete system
Typical project
a complete furnace + AC system (3-ton) — $9,100–$14,000
What's included
- Condenser + coil or heat pump
- Furnace / air handler
- Refrigerant line set
- Permit and startup
What drives the cost
- Efficiency (SEER2 / AFUE)
- Ductwork condition
- System sizing (tonnage)
- Electrical upgrade if needed
Get an exact Illinois quote in 3 minutes
These are local averages. For a precise number, use the free calculator — it auto-adjusts pricing to your ZIP code.
Frequently asked questions
How much does hvac replacement cost in Illinois?
In Illinois, expect $8,100 to $16,200 for a complete system in 2026, depending on materials, scope, and access.
Why is the price different in Illinois?
Illinois labor and material costs differ from the national average, so the same job costs more or less here than elsewhere. Our calculator adjusts automatically by location.
How do I get an accurate quote?
Measure the area, then use the free ConstruMate calculator — it itemizes material and labor at local rates and produces a professional estimate in minutes.