Chicago’s Most Affordable & Reliable Expert HVAC Repair Service for over 28 Years! Serving the Entire Area of Chicago and Surrounding Suburbs Since 1988.

Comfort Zone Service provides the highest quality and most affordable heating repair and air conditioning repair in Chicago and surrounding areas. Our expert repair technicians repair all makes and models of major HVAC equipment including: Aaon, Carrier, Trane, York, Lennox, American Standard, Bryant, Payne, Luxaire, Armstrong, Goodman, Tappan, Rheem, Westinghouse, and more! We repair both commercial and residential HVAC equipment.

Instant dispatch means sudden service! You get help in a hurry

  • Quick response
  • Quick, fast, clean, courteous service
  • Radio dispatched
  • Qualified & trained technicians
  • No such thing as “a job too small”
  • Service response around your schedule, not ours

Warehouse on wheels for One-Stop service
Our warehouse on wheels carries a full line of inventory including all parts to complete your job. This means no waiting for parts, just the prompt service and repair you deserve.

Superheat and Subcooling

A refrigerant undercharge of only 10% can increase operating costs by almost 20%. Which is why Comfort Zone Service uses state of the art gauges, delivering the most accurate charge available. We first determine a temperate drop across your cooling coil, then deliver a 100% accurate charge utilizing superheat and subcooling temperatures.

Leak Detection

Refrigerant should never need to be replaced. If it must be added every year, there is an expensive leak that should be repaired. Comfort Zone Service has state of art leak detection equipment. Combining sensitive sensor technology and ultraviolet leak detection dye, we are able to find and repair undetectable leaks.


Our Service Technicians are dedicated to leaving your home just the way they found it. So, before beginning any repair job, they spread the red carpet to protect the work site. Special consideration for our customers – just one of the things that makes Comfort Zone Service unique.

We have the equipment and expertise to handle all your heating and cooling needs

Services include the following: Residential, Commercial, Industrial