$3,050 – $8,850We estimate furnace replacement in Illinois at $3,050 to $8,850 for a gas furnace on existing ductwork and gas line. The national estimate is $2,950 to $8,350. Illinois HVAC technician pay is 27% above the national median, ranking 3 of 51.
Part of the job
Low
High
Parts and materials (our assumption)
$2,500
$6,500
Labor hours (our assumption)
6
14
Billed labor rate per hour
$93
$167
Estimated total
$3,050
$8,850
Our estimate, not a quote. Billed rate is the Illinois median wage from BLS (2025, $37.21 an hour) times 2.5 to 4.5 to cover payroll costs, overhead, travel and profit. How we estimate
What our assumptions are based on
Item
Sourced figure
Basis
Source
Parts
$1,249 – $1,835
Budget Heating listed prices for 20 gas furnaces, all 80% AFUE, 40,000 to 135,000 BTU. No 90%+ AFUE models were on this list.
General information, not professional advice. Conditions, codes and prices vary. Turn off power, gas or water before any work, and hire a licensed professional when in doubt. Cost figures are our estimates, not quotes.