Allegiance Heating & Cooling – Your Mokena, IL HVAC Contractor

Allegiance HVAC logo showing a cartoon technician holding a toolbox and wearing a hat while giving a thumbs up
Your New Favorite HVAC Company

If you are in need of a HVAC contractor in Mokena or the neighboring area, 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.

Trust In Our Experienced Team

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 Mokena. 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.

Factory Authorized Trane® Dealer

Trane HVAC Company Logo
We are a factory authorized Trane® 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 “subject to credit approval” 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.

HVAC Units on a concrete slab next to a white wall outside on a patch of green grass

Our History

Allegiance Heating & Cooling was founded in 1999 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 & Cooling quickly grew to become a trusted home comfort partner for thousands of Illinois and Indiana residents.

As a family-owned and operated business, Allegiance Heating & Cooling embraces client-focused values that are often overlooked by other HVAC contractors.

Our Principles

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:

  • Prompt Arrival

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

  • Respect for Home & Property

    • 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.

  • Lifetime Guarantee

    • Allegiance Heating & Cooling 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.

  • Competitive Pricing

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

  • Knowledge & Skill

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

Our Expertise

  • Hot water & indirect hot water tank installation & service
  • Detailed Manual-J in-home load calculations
  • HVAC installation, repair, & maintenance
  • Ductless heating & cooling
  • High-velocity duct systems
  • Mini-split duct systems
  • Heat pump services
  • Residential & steam whole-house humidification systems
  • Residential steam boilers & hot water boilers
  • Hot water tank installation & service
  • High-end AC & heating systems
  • In-floor radiant heating
  • Hybrid HVAC systems
  • Geothermal systems
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To learn more about the Allegiance Heating & Cooling team, inquire about pricing
or schedule your service, call (815) 627-1112 or visit our contact page.