Summer Financing Special: 0% interest for 5 years on Select Systems

Reach Out Today for Details!

AC Struggling?
Our Team Can Help!

Call Today to Schedule!

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Need to Improve your Indoor Air Quality This Summer?

Reach Out Today to Get Help!

Summer Financing Special: 0% interest for 5 years on Select Systems

Reach Out Today for Details!

Summer Financing Special: 0% Interest for 5 Years on Select Systems

Reach Out Today for Details!

Need to Improve your Indoor Air Quality This Summer?

Reach Out Today to Get Help!

Virtual Consultations Are Now Available!

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HEATING and COOLING

When it comes to your comfort, our Interstate Heating Co. professionals are experts. Our team is trained, certified, and ready to take care of whatever your HVAC needs may be.

RADIANT HEATING

The installation of radiant floor heat costs more initially than more conventional heating systems, but in the long run, it saves money due to lower thermostat settings and higher efficiency. Call Interstate Heating Co. to schedule a quote today!

INDOOR AIR QUALITY

Your indoor air quality (IAQ) is central to your health and comfort. Enjoy a breath of fresh air and allow our team to find solutions that improve the air quality at your home or business. Let us help keep you safe and comfortable.

SHEET METAL ROOFING

Call Interstate Heating Co. to speak with one of our certified technicians about how a sheet metal fabricated roof can be a durable, cost-effective, and on-demand solution for you.

Our Story

Continuing a Tradition of Exceptional Heating and Cooling Services

What began in a garage in 1962—with Gordy and John Cole’s commitment to offering honest, high quality HVAC service—continues today at Interstate Heating Co. in Sussex. We’ve grown to offer the latest heating, cooling, and air quality products, and our service area now covers all of southeastern Wisconsin.

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We Are a Carrier Factory

Authorized Dealer

Carrier Factory Authorized Dealers work hard for this designation. And all their experience and work is for one purpose—to create comfortable homes and satisfied customers. So when you need a new system, or it’s time to service or repair your current equipment, you can trust you’re working with the best in the business.

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We love hearing from our customers! If you’ve had us work on your HVAC system we would love to hear from you too.

“Our Technician Chris was prompt and diagnosed and fixed the problem with our ac very efficiently. He was informative, courteous and friendly. Great customer service.”
- Jeanette J.
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Three Generations Strong

After all this time, we still follow the most basic rule of business: we treat our customers the way we want to be treated. And we know that comfort is a big part of what makes a house a home, so we make it easier to create and care for an ideal environment.

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5 Ways to Improve Your Indoor Air Quality. Senior woman feeling pain at home.

5 Ways to Improve Your Indoor Air Quality

June 28, 2024
The reality is airborne contaminants, such as dust, dirt, and pet dander, can negatively impact the indoor air quality (IAQ) of your Wisconsin home. At Interstate Heating Co, Inc., we want you to breathe in fresh air, which is why we offer maintenance to keep your HVAC in top shape. Read More
Professional plumber in uniform talking to male client and his small son indoors.

AC Maintenance Checklist

June 14, 2024
Be sure you take the time to perform basic maintenance regularly as well as invest in a professional AC tune-up at least once a year. According to the U.S. Department of Energy (DOE), good maintenance can save money and reduce your energy usage. Read More
Zone Your Way to Comfort. Person using home automation to control lighting, heating, air conditioning ... etc in modern apartment with fireplace, large windows with blinds, wooden floor and concrete ceiling.

Zone Your Way to Comfort

May 30, 2024
Zone controls are a series of dampers retrofitted in your ductwork, coupled with thermostats. They block or permit air from entering customized zones throughout your home. Zoning allows you to control different temperatures in different parts of your home. Read More