Allegiance HVAC logo showing a cartoon technician holding a toolbox and wearing a hat while giving a thumbs up
Allegiance Heating & Cooling Stands Out From The Rest

Since 1999, Allegiance Heating & Cooling has been Mokena’s choice for premier HVAC services. We understand the inconvenience that often comes with a heater or air conditioner that isn’t working the way it should. When you’re in need of reliable HVAC repair, it can be easy to pick the wrong company. That’s where we separate ourselves from the rest.

We Care About The Little Details

We’ve become the trusted home comfort partner for thousands of Illinois and Indiana residents. But it’s our attention to the little things that customers appreciate. For example, we always provide punctual service with prompt arrivals that won’t have you wasting your time. Plus, you can feel confident knowing that our team will be respectful of your home and property. Unfortunately, these details are often overlooked by other contractors. As a family-owned and operated business, we take great pride in these particular values.

We Stand By Our Principles

Whether you need routine HVAC maintenance or a complete overhaul of equipment,
it doesn’t take long for homeowners to discover the principles of our service philosophy:

Prompt Arrival

You don’t need us to remind you of how busy you are! We realize the value of your time, so we’re committed to arriving on time and completing work as efficiently as possible without sacrificing quality.

Respect for Home & Property

As aforementioned above, the Allegiance Heating & Cooling technicians exhibit the utmost professionalism while working at your home. We go the extra mile in protecting your flooring and furnishings with mats, tarps, and shoe booties.

Lifetime Guarantee

Our team is always available to help with projects and future installations. We guarantee our work for the years you own your home, a refreshing change from other contractors.

Competitive Pricing

We strive to obtain the best possible pricing on all materials and equipment for our clients. We’re able to offer competitive pricing because we then pass those savings down to you.


We offer a range of services so we hope that you’ll make Allegiance Heating & Cooling your one-stop shop for all of your HVAC needs. Feel free to ask about our many certifications!

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Don’t let another fly-by-night take advantage of your HVAC dilemma.
Instead, call the pros at Allegiance Heating & Cooling.