Scenic Small Town Nestled Amid Fertile Valley In Beautiful Rural Wisconsin.

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

Reach Out Today for Details!

Amazing Midwest Rural Sunset After Heavy Rains.

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

Reach Out Today for Details!

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Need to Improve your Indoor Air Quality This Spring?

Reach Out Today to Get Help!

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

Reach Out Today for Details!

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

Reach Out Today for Details!

Need to Improve your Indoor Air Quality This Spring?

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.

“Interstate was absolutely wonderful to work with. They answered any and all questions that I had. (And I had a lot of questions) They gave me information on when the work would take place and had my Carrier Infinity furnace/ AC unit in very quickly. The installation crew was also very knowledgeable and polite. They also helped me with paperwork for a rebate as well. Please note that Carrier is the way to go….. My old Carrier AC unit was 38 years old and STILL working!!!
I was in construction for 37 years and can tell good contractor people. Interstate was fantastic to do business with!”
- Gregg B.
“Total Care Package — AC Maintenance & Gas Leak Repair
Dylan is very friendly and knowledgeable. He was able to complete the AC maintenance, re-check the gas leak, and repair the gas pipe where the gas leak was with no problems. Thanks Dylan!”
- Bobbi H.
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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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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
Why Schedule Air Conditioning Maintenance? Engineer adjusting thermostat for efficient automated heating system.

Why Schedule Air Conditioning Maintenance?

May 15, 2024
It’s about to heat up here in Sussex. Make sure your air conditioner (AC) is primed for the Wisconsin summer heat rays by scheduling a seasonal maintenance visit. Read More
Why Is a Home Dehumidifier Important? Glass door with condensation and a tree, high humidity.

Why Is a Home Dehumidifier Important?

April 30, 2024
Our professionals at Interstate Heating Co, Inc. want to provide you with the information to create a healthy, comfortable environment for you and your family. Here is some important information about dehumidifiers and the role they play in your home’s health and comfort. Read More