Furnace Installation & Replacement Services

McHenry County’s Furnace Experts, Just A Call Away

Furnace Maintenance, Repair & Installation Near Crystal Lake, IL

  • Serving Crystal Lake Since 1986
  • We Work With All Makes And Models
  • 24/7 Emergency Service
  • NATE-Certified Technicians
  • Award-Winning HVAC Service

We make it easy for home and business owners in Northern Illinois to get a reliable and affordable new furnace with discounts, specials and rebates that are offered to all of our customers. When you set up furnace installation or replacement services from our talented technicians at Harmonic Heating & Air Conditioning, you can count on a heating system that will run smoothly and efficiently for years to come.

When your new furnace arrives, our friendly, skilled technicians will be there to provide expert installation services in your space. Surrounding areas will not be disturbed and the job site will be thoroughly cleaned afterwards — we respect your home as if it was our own and take every job very seriously.

Armstrong Air Furnace

Armstong Air HVAC
Harmonic is your local furnace replacement expert!
Schedule your furnace estimate with Harmonic today.

Our Featured Armstrong Air Furnaces

Armstrong Air Furnace

High EFficiency +97% AFUE Furnaces

High Efficiency Modulating Furnaces
  • Up to 97% AFUE
  • Variable Speed Fan Motor
  • Pro Series™ Systems
Armstrong Air Furnace

96% AFUE Furnaces

Two-Stage, Constant Torque Furnaces
  • Up to 96% AFUE
  • Two-Stage Heating
  • ENERGY STAR® Certified
Armstrong Air Furnace

80% AFUE Furnaces

Single-Stage, Constant Torque Furnaces
  • 80% AFUE Efficiency Rating
  • Constant Torque Motor
  • Quiet Combustion™ Technology

Our Installation Process

Our Installation Process
Harmonic is your local furnace replacement expert!
Schedule your furnace estimate with Harmonic today.

Rock*Star Maintenance Plans

Our annual maintenance programs at Harmonic Heating & Air Conditioning provides better health and longevity for your home or commercial heating and cooling systems.


$19 Per Month

$228 Annually

Best Value

$29/mo or $348 Annually

$456 Annually

Why Replace Furnace the Aging Furnace in Your Crystal Lake Home?

Once the furnace installation or replacement process is finished, we will help you maintain it so that it lasts as long as possible. You can count on our service professionals to keep your furnace working better and longer, so you can stay comfortable all winter long.

Our furnace sales staff can design the most efficient and comfortable heating system to meet your budget, needs, and lifestyles. We take the structural requirements for your space into consideration with all of our recommendations. When choosing a new furnace, considerations should include respiratory issues and allergies — talk to our experts about all your concerns and we will guide you through the decision making process.

Our Harmonic HVAC experts will do all they can to make owning a furnace easy with excellent maintenance services and numerous affordable options will be available to you. The best part about our installation service is our speed and efficiency, so no matter what time you need us to work, we will ensure the job is done quickly so that you can get back to your routine.

Contact Our Team

Furnace Cleaning in McHenry County

Is your furnace not producing enough heat? Are your gas bills extremely high? Is your furnace failing to keep up with the harsh winters of Northern Illinois? If you answered yes then it’s likely time for a tune-up. We perform annual services with countless benefits for your furnace and space’s comfort. Call us today for your estimate in your commercial or residential space near Crystal Lake, IL!

As one of the best teams for furnace installation in Northern Illinois, we strive for customer satisfaction. We understand manufacturer's warranties do not cover certain items like ductwork repairs, labor, and other equipment costs, which is why we help by offering maintenance agreements. Here’s a peek at what maintenance checks look like with our professional team at Harmonic Heating & Air Conditioning:

  • Check flue system for safety & carbon monoxide leaks
  • Check return & air filter
  • Lubricate motors and bearing as necessary
  • Check all parts for visible wear & tear
  • Check gas train and all electrical components / connections for safety
  • Test thermostat operation
  • Clean and check heat pump assembly if necessary
  • Check proper burner ignition and efficiency
  • Confirm complete system operation and safety
Harmonic Heating & Air Conditioning Service Area

Proudly Providing
Service Near You

Cook   DuPage   Kane   Lake   McHenry

Furnace Repair Services From Harmonic Heating & Air Conditioning

Before the cold winter months in Crystal Lake and Northern Illinois are upon us, it's a good time to get your furnace inspected or repaired by one of Harmonic Heating & Air Conditioning professional repair technicians.

Harmonic Heating & Air Conditioning has established itself as the premier furnace repair specialist in our community in and near McHenry County, and you can take advantage of our affordable furnace repair services around the clock! Contact us today to get started on furnace installation, repair, or maintenance service from Harmonic Heating & Air Conditioning!

  • Family Owned HVAC Contractors
  • Fully Licensed & Insured
  • 24 Hour Service
  • We Service Your Area
  • Around the Clock Customer Service
  • Affordable Repairs
  • All Makes and Models
  • Superior Service

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