If you are in need of a Chicago HVAC contractor, call on Allegiance Heating & Cooling. We are a family owned and operated business committed to customer satisfaction. We provide punctual service with prompt arrivals that won’t have you wasting time. You can trust in our team of experienced HVAC contractors to always be respectful of your home and property. We provide excellent HVAC service to residents of Crete, Monee, Frankfort, and Homer Glen. Whether you are in need of a new air conditioner or are looking into a geothermal heating system, our dedicated team of contractors is happy to help. We are a factory authorized Carrier dealer, and service all makes and models of HVAC systems. No project is too large or too small for our team of NATE certified technicians. We offer competitive pricing as well as financing options to better meet your needs. We realize how important it is that your system is working properly, especially during inclement weather. We are available for emergency air conditioning services, and we offer a lifetime guarantee on all our parts and repairs, as well as comprehensive preventative maintenance agreements. Call Allegiance Heating & Cooling today to speak with an HVAC contractor about our HVAC services and to set up a free in-home estimate.


Allegiance Heating was founded in 2000 when Ronald Gravitt and his father merged two HVAC companies that had been in business for over two decades. Built on the experience and client base of their previous companies’ success, Allegiance Heating quickly grew to become a trusted home comfort partner for thousands of Illinois and Indiana residents. As a family-owned and operated business, Allegiance embraces client-focused values that are often overlooked by other HVAC contractors. When you partner with us to replace your old heating and cooling system or repair existing equipment, you’ll discover, firsthand, the principles of our service philosophy:


We realize the value of your time, so we’re committed to arriving on time—and completing work as efficiently as possible.


Our uniformed technicians exhibit unwavering professionalism when they enter and leave your home. We protect your flooring and furnishings with mats, tarps and shoe booties, and always treat your property as if it were our own.


Allegiance has been around for many years and is always available to assist with project follow-through and future installations. Unlike other fly-by-night companies, we guarantee our work for the number of years you own your home.


Allegiance works to obtain industry-best pricing on all materials and equipment. Then, we pass those savings onto you: offering affordable pricing without sacrificing quality.


Our team members are trained to put in multiple types of heating systems and are certified in a broad range of HVAC fields. Expertise includes:

  • Geothermal systems
  • High-velocity duct systems
  • Mini-split duct systems
  • Residential steam boilers and hot water boilers
  • Hot water and indirect hot water tank installation and service
  • In-floor radiant heating
  • Hot water tank installation and service
  • High-end AC and heating systems
  • Residential and steam whole-house humidification systems
  • Hybrid HVAC systems
  • Detailed Manual-J in-home load calculations

To learn more about the Allegiance Heating team, inquire about pricing or request an in-home energy audit, call 815-464-1601 or visit our contact page.