Furnace Repair & Service

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Furnace Repair — Stay Warm With Services From Harmonic Heating & Air Conditioning

At Harmonic Heating & Air Conditioning, our goal is to offer dependable, high-quality heating system installation, maintenance, and repair for all of our valued customers.

Whether you own a single family home or a large commercial building in the Crystal Lake area, we're here to design a heating solution that will best serve the needs of you and your space.

Our HVAC contractors are focused on going above and beyond to ensure your complete satisfaction. We recognize the importance of your furnace during the cold months, which is why we take a thorough, methodical approach to HVAC service.

Harmonic Heating & Air Conditioning provides the highest level of quality in all of our heating system installation projects, and all jobs are performed by highly experienced, NATE-certified contractors you can trust. We strive to keep our prices reasonable and affordable, and we offer a variety of heating systems to suit your needs and budget.

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Why Choose Harmonic Heating & Air Conditioning?

Serving Crystal Lake Since 1986

We Work With All Makes And Models

24/7 Emergency Service

NATE-Certified Technicians

Award-Winning HVAC Service

Heating Services & Furnace Repair

As your furnace or ductless mini split system ages, general wear and tear can cause it to stop working efficiently. And in more extreme cases, older heating systems can suddenly stop working entirely.

If you need commercial or residential heating system repair service in Northern Illinois, trust that you can count on Harmonic Heating & Air Conditioning to get the job done right. We pride ourselves on providing the highest level of quality and service whenever we're called to the rescue.

Harmonic Heating & Air Conditioning can tackle your heating system repair no matter how large or small the issue you’re experiencing. When you work with us, we'll take the time to answer any questions you have and explain our methodology for addressing your heating system issue. We understand how much you rely on your heating system during cold weather during Illinois winters, so we'll be certain to take a thorough approach when handling your repair job.

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Check These Things On Your Furnace Before You Call Us:

We love serving the Northern Illinois community with excellent, reliable HVAC services for residential and commercial spaces in the area. But sometimes, a service call reveals a simple fix that could save you time and stress. Here are a few tricks to try when troubleshooting your furnace before calling our pros at Harmonic Heating & Air Conditioning for help:

You should make sure that your thermostat is in "On" mode, set to "heat" and the desired room temperature is set higher than the current ambient temperature.
Assure that your circuit breaker is "ON" for your heating system.
Ensure that your "SYSTEM SWITCH" is set to "ON". This switch typically is a toggled dial-plate that may have a RED casing.
When your Furnace thermostat was out of commission or the system power was shut down, after turning the system back on, give it a few minutes — many AC systems have a time-delay function on startup.
If your system is blowing warm air, but not heating as well as it should, check your furnace filter, clean and replace it and restart the system.