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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 Maintenance in Grayslake, IL 60030

“Had my annual Trane Furnace PMA check performed yesterday as I have for over 30 years. Great products, service and staff. What's not to like?” – Conrad G.

Gas Furnace Maintenance in Grayslake, IL 60030

“Josh arrived on time and did maintenance on furnace. In this COVID-19 environment, he wore his mask and shoe coverings when in house. Miller put in new HVAC 3 years ago and what a difference over previous system.”

– Michelle O.

Gas Furnace Maintenance in Grayslake, IL 60030

“As always, great service. Thanks.”

– Duane O.

Gas Furnace Maintenance in Grayslake, IL 60030

“Other than the technician going to the wrong house, all is well. It pays to have a sense of humor.”

– Barbara N.

Gas Furnace Maintenance in Gurnee, IL 60031

“Excellant service on time and knowledgeable.”

– yvonne l.

Gas Furnace Maintenance in Grayslake, IL 60030

“We've been using Miller's Heating for almost 23 years – for everything heating/cooling related, and could not be happier with the service and quality of their work. They are great to work with, always prompt and knowledgable. Would definitely recommend.”

– Jeannine Z.

Gas Furnace Maintenance in Lake Villa, IL 60046-9296

“Great customer service! Looking forward to the spring for the estimate on a new furnace and air conditioner unit!”

– Sharon P.

Gas Furnace Maintenance in Beach Park, IL 60096

“Our technition was AWESOME! He was personable, efficient, and even friendly with our 5 year old black lab! Also, the gal I speak with on the phone to make appointments and such is fabulous as well. Keep up the great work, Miller's AH!


– Cathy T.

Gas Furnace Maintenance in Grayslake, IL 60030

“Josh arrived right on time and wore mask and booties. He was very professional and friendly and answered all of our questions. Thank you Miller's.”

– Mary C.

Gas Furnace Maintenance in Grayslake, IL 60030

“As usual, prompt service.”

– Rita Z.

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.