Harmonic Heating & Air Conditioning is here for you! Call us today when you need gas furnace service, repair or replacement needs! Harmonic is your local comfort expert!

High-Efficiency Furnaces


Furnace Maintenance, Repair & Installation

We make owning a new furnace easy in terms of affordability and maintenance. We have many discounts, specials and rebates that are offered to all of our customers. The benefits with our furnace installations are so numerous that you will be counting them for months to come.

When your new furnace arrives, our friendly technicians will install it with their skilled techniques right in your home. 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.

Improve your comfort system's efficiency with these equipment add-ons

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We are now a certified Armstrong Air Comfort Team

We are now a certified Armstrong Air Comfort Team


As one of the best companies for furnace installation in Montgomery, Oswego, Plainfield, Sugar Grove, Batavia, and their surrounding communities, we strive for customer satisfaction. We understand manufacturer's warranties do not cover certain items like duct work repairs, labor, and other equipment costs, which is why we help by offering maintenance agreements.

Harmonic Heating & Air Conditioning is your furnace expert! We can take care of any furance maintenance, repair or installation you need!

Furnace Inspection Checklist:

  • 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

Furance Cleaning

Is your furnace not producing enough heat? Are your gas bills extremely high? Is your furnace failing to keep up with the harsh winters? If you answered yes then you could use a tune-up. We perform annual service that has many benefits for your furnace. Call us today for your estimate!

Why Get A New Furnace?

Once the furnace install is finished, we will help you maintain it so that it lasts as long as possible. You can trust our service professionals to keep your furnace working better and longer.

Our Furnace sales staff can design the most efficient and comfortable heating system to meet your budget, desires, and lifestyles. We take the structural requirements for your home 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 experts will do all they can to make owning a furnace easy. Numerous affordable options will be available to you. The greatest 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 in the best possible manner.


Furnace Repair

Before the cold winter months in Montgomery, Oswego, Plainfield, Sugar Grove, Batavia, and their surrounding communities are upon us, it's a good time to get your furnace inspected or repaired by one of Harmonic Heating & Air Conditioning's professional repair technicians.

Harmonic Heating & Air Conditioning has established itself as the premier furnace repair specialist in Montgomery, Oswego, Plainfield, Sugar Grove, Batavia, and their surrounding communities, and you can take advantage of our affordable furnace repair services around the clock! Here are just a few of the reasons why you should choose Harmonic Heating & Air Conditioning for your furnace repairs:

  • 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

Armstrong Air Furnaces


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Armstrong Air Furnaces