Skip to content



Miller's Area Heating is the leading HVAC company in Grayslake, IL, 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.

The AFUE Calculator is disabled because JavaScript did not properly load.

To view the calculator please try your browser's refresh button, enable JavaScript, or try a different browser.

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 Grayslake, IL 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 Miller's Area Heating, and we can set up an appointment to calculate the furnace size you might need.

Need Furnace Service?

Contact the experts at Miller's Area Heating.

Call us at 847-223-0211!

Gas Furnace Replacement in Lake Villa, IL 60046

“Thank you so much for working with me today, replacing my furnace fan. Excellent work and real kindness … sincerely THANK YOU !

I will definitely call again the next time I have any HVAC needs !” – Ken H.

Gas Furnace Installation in Lake Villa, IL 60046

“One of the best experiences with a repair company I have had in a long time. They got my 27 year old furnace running again in an emergency and sold me a new HVAC system to my needs without upselling, very honest. The installation team was awesome and professional. They went above and beyond by fixing an issue that was needed but not part of the installation. Would definitely recommend and will use for other services as needed.”

– Joe G.

Gas Furnace Repair in Round Lake Park, IL 60073

“The service technicians are great. Just point and say whats wrong and they know what to do :)”

– Candy L.

Gas Furnace Maintenance in Grayslake, IL 60030

“Always have good service with Miller Heating. Thank you John.”

– John M.

Gas Furnace Maintenance in Lindenhurst, IL 60046

“First time client by a referral. The next day appointment was much appreciated! Josh was great! He arrived promptly just before 8:30 am and was professional yet personable. He updated me on the maintenance steps along the way. I needed a new switch part which was installed same day. Josh mentioned the yearly maintenance package which I signed up for; the reminder will really help come spring/summer. Josh noted the year on my hot water heater and suggested an upgrade in the near future. He gave me a quote so I could work that into my budget. I appreciate the follow up via email; very automated and efficient! Thank you!”

– Becky S.

Gas Furnace Maintenance in Round Lake Beach, IL 60073

“My new furnace wasn’t working properly. Your technician resolved the problem quickly an it is now working great!”

– Jean S.

Gas Furnace Repair in Libertyville, IL 60048

“Joe was extremely professional, he knew what he was doing, he explained it to me so I could understand, and did an outstanding job. We are extremely pleased!”

– Marty J.

Gas Furnace Replacement in Grayslake, IL 60030

“great experience from start to finish! Russell could not have been nicer.”

– charles L.

Gas Furnace Maintenance in Grayslake, IL 60030


– Diane C.

Gas Furnace Repair in Grayslake, IL 60030

“Super Bowl Sunday is NOT the day to have your furnace stop working, but it did! Joe was out within an hour and was thorough and efficient. He needed a new part and got it from the Miller's inventory and returned to install it quickly. We thought he was great!!!!”

– Jill L.

Miller's Area Heating proudly provides HVAC service to Grayslake, Libertyville, Round Lake, Wildwood, Ingleside, and the surrounding Illinois communities. Visit our service area page for more coverage details, call us at 847-223-0211, or request service online today.