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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.

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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!

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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.

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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.

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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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Proudly Partnered with

Brewers
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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.

Air Conditioner Repair in Oak Creek, 53154

“Eric was my service tech and he was great. Fixed my problem in minutes and gave me helpful tips for the future. His service was an A+++. Everyone I dealt with on the phone was extremely nice as well. I will definitely be calling Interstate Heating for all my needs.”
- Linda K.

Gas Furnace Installation in Waukesha, 53189

“Workers were competent and professional. They did, however, leave something undone near the air conditioner. They did return promptly and resolve the issue.”
- michael 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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Thermostat 101 Basics. European girl choosing temperature on thermostat of smart home system while her black boyfriend looking at her. Concept of modern technologies in domestic lifestyle. Interior of kitchen.

Thermostat 101 Basics

October 30, 2024
In the heating, ventilation, and air conditioning (HVAC) industry, your thermostat is the undisputed leader of the heating and cooling team. It signals your furnace and air conditioner (AC) when to turn on and off. Whenever your thermostat detects a temperature change that’s different from the desired setting in your Mequon home, it barks out a new directive to adjust the indoor climate. Read More
Transitioning Your Heat Pump. Close-up of black full inverter heat pump outside in the garden, near wooden pool house on a sunny day. Lens flare on the image.

Transitioning Your Heat Pump

October 15, 2024
One reason Wisconsin homeowners love heat pumps is they function as an all-in-one unit. Instead of purchasing and maintaining a separate furnace and air conditioning system, you can simply transition your heat pump from the heat setting to the cooling setting and vice versa as seasons warrant. Read More
What’s That Smell Coming From My Furnace? Worried senior smartphone user getting bad, concerning news message, holding mobile phone, looking away, feeling stressed, anxious, thinking over problems, sms answer.

What’s That Smell Coming From My Furnace?

September 30, 2024
If your furnace is producing a strange smell, you should always treat it with caution. While the cause for the odor may be benign, it could just as easily be harmful to inhale. When in doubt, always open windows to ensure ventilation, and evacuate your Mequon home. Read More
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