Gas Furnaces

Furnace service.

Interstate Heating Co. is the leading HVAC company in Sussex, WI, for your furnace service needs. We service and repair all makes and models. If you need furnace service, we are the company to call. Our skilled technicians are qualified to solve just about any repair or installation that you throw at us.

How Much Money Can a New Furnace Save You?

Our AFUE energy savings calculator can help determine how much you could save on your utility bills. Simply enter your current unit's AFUE value and compare it to a newer, more efficient system. You can even customize it to better match your home's system for a more accurate calculation.

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Furnace Repair

Don’t get left in the cold! Is your furnace acting up, blowing cold air, or making too much noise? Our experienced team of professionals is here to keep your home warm and cozy. We repair all makes and models, and we will never try to sell you a service that you don’t need. Our technicians are honest and hard working, and we’re always transparent and fair about the work we do.

Furnace Replacement

Sometimes a repair is not sufficient to fix your furnace. Sometimes a new furnace is the most cost-effective and energy-efficient way to go. We will always be honest with you about a possible furnace replacement. We value our time and your money––we don’t want to perform repairs or service on an appliance that is in need of replacement.

If you do need a furnace replacement, we know how overwhelming it can be. Here are some of the frequently asked questions about furnaces that we get from some of our Sussex, WI residents:

What Are The Different Types Of Furnaces?

Single Stage: A single-stage furnace has only one stage of operation. It can either be turned on or turned off.

Two Stage: A two-stage furnace has two settings––full and half speed. This is a more efficient way to heat and provides for better comfort, because it can move the air at a slower pace.

Variable Stage or Modulating: A variable-stage or modulating furnace modulates the speed and heat output based on the temperature outside and the desired comfort level. This furnace only works as much as you need it, making this type the most energy-efficient type of furnace.

What Is AFUE?

AFUE, or Annualized Fuel Utilization Efficiency, is a measure of furnace-heating efficiency. The higher the AFUE, the more efficient the furnace.

What Size Furnace Do I Need?

We can calculate the correct size furnace for your home. The number of BTUs, or British Thermal Units, needed to heat your home is dependent on a number of variables. Contrary to what you might think, a bigger furnace may not necessarily mean more heating power for your home. Call us at Interstate Heating Co., and we can set up an appointment to calculate the furnace size you might need.

Gas Furnace Repair in Mequon, 53092

“Very easy to work with. Quick response and very professional. I would highly recommend.”
- Suzanne C.

Gas Furnace Maintenance in Waukesha, 53149

“Thank you Ethan for your excellent, friendly service!”
- John B.

Gas Furnace Repair in Pewaukee, 53072

“Technician diagnosed the problem, ordered a replacement part, and then a different technician came back to install the part after it came in. The furnace is now working properly. Thank you Jason and Kevin.”
- Robert L.

Gas Furnace Repair in Pewaukee, 53072

“Prompt, knowledgable and very courteous service by Kevin.”
- Johannes S.

Gas Furnace Repair in Sussex, 53029

“Our technician was extremly polite, helpful, and knowledgeable. He was also at our home within 30 min of us calling.”
- Christine R.

Gas Furnace Repair in Richfield, 53017

“Great experience. Ethan is very professional and well-spoken.”
- Matt S.

Gas Furnace Repair in Richfield, 53017

“Very prompt and very courteous after hours service. Thank you”
- Steven R.

Gas Furnace Maintenance in New Berlin, 53151

“Your tech’s are always extremely helpful, understanding and knowledgeable”
- mark W.

Gas Furnace Maintenance in Mequon, 53012

“Professional, on time, Kevin is a pleasure to work with.”
- Ken R.

Gas Furnace Installation in Waukesha, 53186

“Jason did a great job installing our new furnace.”
- Jim H.

Need Furnace Service?

Contact the experts at Interstate Heating Co.

Call us at 262-246-4772!