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Former technician built Interstate Heating & Air Conditioning with expert know-how and incomparable leadership.

In 2002, Kai Harwood, a former service technician himself, realized his dream by founding a small HVAC business in Oklahoma City. Since then, Interstate has grown to over 18 employees serving hundreds of satisfied clients throughout Oklahoma City and the surrounding area.

At Interstate, we pride ourselves on great customer service and estimates you can trust. As Harwood always says, “If we mess up, we’ll make it right!”

In recognition of our customer-first policy, Interstate has been awarded an A+ rating with the Better Business Bureau. At Interstate Heating & Air Conditioning, you can depend on our certified and professional technicians. Our technicians can do it all! Furnace and air conditioning repair? No problem. Annual maintenance and tune-ups? We can handle that. Complete system replacement? We’re on our way!

HVAC emergencies can be costly and frustrating, but don’t panic; Interstate’s got the road map.

The Road to Comfort!

Get street-smart service. It’s all downhill from here.
Interstate was built by its customers, and we will always put you first. Besides providing quality furnace and air conditioning repair in Oklahoma City and the surrounding areas, we pride ourselves on providing outstanding customer service.

If you have any questions about your home comfort system, pricing options, or what special services are available to you, don’t hesitate to give us a call. Our friendly and knowledgeable customer service team is here to help you address any and all of your HVAC needs or concerns.
To get your free home estimate, pick up the phone and dial (405) 912-5900.

Trusted Technicians

Our prompt and professional technicians go the extra mile!

Our background checked and drug-free technicians are courteous and respectful of your home. Interstate technicians aren’t just skilled; they’re also sincere. We would never hire anyone we wouldn’t have working in our own home.

Members of our team are respectful, reliable, and professional. They will leave your home as clean, or cleaner, than when they found it. Call today for a free estimate and Emergency Services 24/7.

Club Membership

Like a car, your HVAC system needs regular maintenance.

Interstate makes it easy to protect your investments. Whether your system is brand new or many years old, we know how important it is for you to maintain the quality of comfort in your home. Upkeep your investment and never worry again with the Interstate Maintenance Club. We offer an affordable plan to fit your needs. Shield Protection Plans start at $15 a month and offer a variety of benefits.

Shield Protection Plans

Appointments within 24 hours
FREE precision tune-up (2x a year)
Up to 15% discount on service repairs
Up to $2000.00 off a new complete system
Extended parts warranty – never pay for the same part twice!
No overtime charges!
Hassle-free monthly Auto-Pay

Give us a call at (405) 912-5900 to schedule a free home consultation and learn more about our energy and money saving services.