$120 – $580We estimate thermostat replacement in Illinois at $120 to $580 for one standard or smart thermostat on existing wiring. The national estimate is $100 to $510. 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)
$30
$250
Labor hours (our assumption)
1
2
Billed labor rate per hour
$93
$167
Estimated total
$120
$580
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
$139 – $259
ecobee's listed prices for its three new smart thermostats. No non-smart model was priced, so this does not cover the low end of the job.
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.