Free SMART Thermostat with Free Installation

Must apply for eligibility. Ameren Illinois Eligibility Guidelines: Must be a residential customer of Ameren Illinois, heating with gas or electricity delivered by Ameren Illinois. Live in a qualifying ZIP code. You have not exceeded the maximum smart thermostat rebate during the lifetime of your account with Ameren Illinois at your current address. Contact Air King for complete details. Restrictions apply.

250 E. Eldorado St., Decatur, IL 62523

See Disclaimers

HVAC Repair & Installation Specials

Discover Exclusive Deals for HVAC Services

View Specials

Our Latest News

Why Isn’t My AC Cooling My House in Decatur, IL?

May 7, 2026

Why Spring Is Best for HVAC Maintenance in Bloomington, IL

April 6, 2026

Apply for the Ameren Illinois Home Efficiency Income Qualified Program

The Ameren Illinois Home Efficiency Income Qualified Program provides energy-saving home upgrades at significant savings to eligible customers. Upgrades can include a new high-efficiency furnace system, along with full insulation upgrades.

Eligibility criteria:

Live in a single-family home
Must be an Ameren Illinois residential customer heating your home with gas or electricity delivered by Ameren Illinois OR an Ameren Illinois residential electric customer heating your home with propane
Maximum gross annual household income at or below the amount listed for your area on the Income Qualification Chart below

Download

Call or Click to Schedule an Appointment Today!

100% Satisfaction Guaranteed