Service Area

The Best Heating and Air Conditioning Company In Four Counties

When you choose Interstate Heating, you’ll be working with the leading heating and cooling company in southeastern Wisconsin—with fast, dependable service for Waukesha, Washington, Ozaukee, and Milwaukee counties and beyond. We have a large team of NATE-certified technicians, so we can respond quickly to any request, anywhere in the area. From installing a new furnace or air conditioner to troubleshooting tips and repairs, our services ensure a comfortable home. Contact us online to request a free estimate or to schedule preventive maintenance, or call 262-246-4772 for 24-hour emergency service if you suddenly lose heat or have an AC breakdown.

Our Sussex-Based HVAC Service Keeps Southeastern Wisconsin Comfortable

Our reputation for excellence has been built over 55 years while serving the communities surrounding Sussex, so you can trust us to keep our word and keep you comfortable. We are a Carrier® Factory Authorized Dealer and we guarantee you will be happy with our products and services for years to come. Just let us know how we can help you, and our team will bring comfort home to you. Cities we serve include, but aren’t limited to:

Schedule a Consultation

  • This field is for validation purposes and should be left unchanged.


Find out about current coupons, energy rebates, and cash incentives.

N53 W24950 S. Corporate Circle
Sussex, WI 53089

Phone: 262.246.4772
Fax: 262.246.0296


Interstate Heating Co., Inc. | Copyright | All Rights Reserved. | Site Map | Powered by SAUCE Advertising