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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.

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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 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 Repair in Ingleside, IL 60041

“Fast service. Received call of who would be coming and when. Serviceman knowable, polite and friendly. THANK YOU!!” – Janet E.

Gas Furnace Maintenance in Lake Villa, IL 60046

“Miller Area Heating has earned my business for over 30 years. Technicians are always friendly and knowledgeable and always on time.”

– Gary M.

Gas Furnace Maintenance in Grayslake, IL 60030

“Met Ben for the first time. Knowledgeable and I believe he did a good job. Time will tell.”

– Jud R.

Gas Furnace Maintenance in Wildwood, IL 60030

“All went very well”

– Ray P.

Gas Furnace Maintenance in Gurnee, IL 60031

“Always prompt and look/act professional. Thanks for keeping us warm!”

– Chad A.

Gas Furnace Maintenance in Gurnee, IL 60031

“on time, friendly, answered all my questions and did a through job. well done.”

– kenneth y.

Gas Furnace Maintenance in Grayslake, IL 60030



Gas Furnace Repair in Mundelein, IL 60060

“I was extremely pleased, first that you moved me to the top of your work list because I had no heat, and then because of the pleasant, professional way the repair was handled. I was especially impressed that Ms. Miller herself ran the part out to me so it would reduce Shane's time and get the part installed in a timely fashion. I had heat again in one day when I was afraid it would take much longer! Yay! Thank you!”

– Joyce L.

Gas Furnace Maintenance in Grayslake, IL 60030

“Great work as always. Dan was very efficient and looked everything over.”

– Michael S.

Gas Furnace Maintenance in Round Lake Beach, IL 60073

“Very satisfied with the maintenance on our Gas Furnace and Whole House Humidifier. Shane did a good maintenance of our furnace and humidifier and he explained to me all he did to clean them. I'm always satisfied with your company and competent people. Thank you. See you in late Spring.”

– Lois T.

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.