HVAC Contractor | Heating, Ventilation, Air Conditioning & Air Treatment

Decatur Air Conditioner Repair

Design-Air is a second generation family-owned and operated Decatur air conditioning repair company that is dedicated to customer satisfaction. Since 1977, we have been repairing, replacing, and maintaining commercial and residential HVAC systems and can service all makes and models. We are a proud Carrier Factory Authorized Dealer and employ NATE certified technicians so you know we have the seal of approval from the best in the industry. If you suspect your air conditioner is in disrepair, give Design-Air a call. We even offer after-hours services because we know system breakdowns don’t often happen during convenient business hours. When it comes to AC repair, Decatur residents always call Design-Air. Give us a chance and find out why!

RESIDENTIAL AND COMMERCIAL – SERVING THE DECATUR, ILLINOIS AND SURROUNDING AREA SINCE 1977

As a Carrier®, Factory Authorized Dealer, we are proud of our 34 years of service to the Decatur area and look forward to helping you with your air conditioning and heating needs. We are pleased to serve both residential and commercial customers with sales, service, and installation of a comfort system that is ideal for your home or business.


  • Geothermal Experts since 1985

  • Carrier Factory Authorized Dealer

  • Nate Certified

  • Free Estimates for System or Equipment Replacement*

  • Service 24 Hours a Day, 365 Days a Year


High Efficiency Furnaces and AFUE

A high efficiency furnace is one with an AFUE (Annual Fuel Utilization Efficiency) rating of 90 or higher. This number means that a furnace with an AFUE of 87 would convert 87% of the energy it uses directly to warm air to heat your home or business. Some furnaces have a rating as high as 98.5, so the savings that could add to your energy bill could add up to a lot of money over the lifetime of the unit. Since a high efficiency furnace lasts over twice as long as a traditional unit and needs fewer repairs and less maintenance, that is just one the many ways it will save you money.

Purchasing an Energy Star Heating System

Once you’ve decided the time is right for a new furnace installation, turn to our expert technicians for free estimates and knowledgeable advice. Consider investing in an Energy Star furnace – systems that have earned the Energy Star label meet stringent energy efficiency regulations set by the U.S. Environmental Protection Agency. Keep these facts in mind about Energy Star:

  • Certified gas furnaces are 12 – 16% more efficient than standard ones, while qualified oil furnaces are up to 4% more efficient.
  • A likely reduction in utility bills can equal a $36 – $94 annual cost savings to you, dependent on the model you choose and your area’s climate.
  • Energy Star furnaces promote cleaner air as they release fewer emissions.

Wondering how Energy Star furnaces achieve this type of performance? These heating systems have high Annual Fuel Utilization Efficiency (AFUE) ratings and higher efficiency blower motors, as well as advanced technologies like modulating heat and variable speed fan motors. Contact us today to get started on an Energy Star furnace installation or for heater repair, Decatur residents!

Design-Air has provided courteous, professional, on-time HVAC services that improve the comfort and health of our Decatur area residents and businesses.

Our mission is simple: Provide maximum comfort, health, and energy savings at affordable prices.

*Does not include estimates for service calls.