Welcome to Interstate Heating Co., Inc.

At Interstate Heating Co., Inc., we are committed to providing expert heating and cooling solutions to homes and businesses in Sussex, WI, and surrounding areas. With years of industry experience, our team is dedicated to delivering top-notch services that keep you comfortable year-round. From installations and air conditioning repairs to custom HVAC fabrication, we do it all—fully licensed and insured for your peace of mind.

Comprehensive Furnace Services

Our range of services at Interstate Heating Co., Inc. includes:

• Furnace Repairs: Odd-sounding noises, a spike in energy bills, or constant cycling—these signs indicate the need for a furnace repair. Don’t wait for a minor issue to turn into a costly problem. Give us a call today if you detect a problem with your HVAC system. We promise never to replace a part unless necessary—or if we can demonstrate significant cost savings.
• Furnace Maintenance: Want to get the most value from your HVAC system? Develop a preventative furnace maintenance plan. Doing so can rejuvenate your equipment, increase your comfort, and lower your operating costs.

  Give us a call today and ask about our customized Maintenance Agreements tailored to fit your budget and needs. Enjoy peace of mind knowing a trusted professional is watching over your HVAC equipment.

• Furnace installation and replacement: Don’t invest in a quality HVAC system and then hire a substandard contractor to install it. You will never enjoy the full benefits of a system installed incorrectly.

  At Interstate Heating Co., we specialize in furnace installation the right way. We take our time to ensure everything is measured correctly. Our team will also conduct a thorough energy audit of your home to find additional ways to lower your energy use.

  Be sure to ask about our convenient financing options (subject to approved credit) designed to make it easy for you to create your dream home.

Why Choose Us?

At Interstate Heating Co., Inc., customer satisfaction is our top priority. Here’s why homeowners and businesses trust us:

• Fully Licensed & Insured: Rest easy knowing that our team is fully licensed and insured, ensuring that every job is completed safely and to the highest standards.
• Experienced Technicians: Our technicians are highly trained and experienced in handling all types of HVAC systems, no matter the make or model.
• Maintenance Program: Join our maintenance program to keep your HVAC system in top shape year-round. Members enjoy discounts on repairs and other exclusive benefits.
• Custom Fabrication: With our custom sheet metal fabrication services, we can design HVAC systems that are perfectly tailored to your home or business.
• Financing Options Available: We understand that HVAC repairs and installations can be costly. That’s why we offer financing options, including 0% interest for qualified customers.

Special Offers

We are always looking for ways to make your experience with us even better. Take advantage of our special offers:

• Referral Program: Refer a friend and receive discounts on future services.
• Rebates: Ask us about available rebates for energy-efficient HVAC system installations.
• Financing Options: We offer 0% interest financing for qualified customers. Contact us to learn more!

Schedule Your Service Today

Don’t wait until your heating or cooling system breaks down. Contact Interstate Heating Co., Inc. today to schedule your service. Our friendly team is ready to answer any questions and ensure that your home stays comfortable, no matter the season.