Air Conditioning Repair & Tune-Up Services

Crystal Lake’s HVAC Experts Since 1986

Get Your Estimate

Book Now

AC Repair For All Makes and Models

Specializing in residential air conditioning repair and maintenance services, Harmonic Heating & Air Conditioning is dedicated to keeping our customers in the Northern Illinois community cool and comfortable all summer long.

At Harmonic Heating & Air Conditioning, our team of HVAC professionals believe in going above and beyond to ensure your complete satisfaction. We understand that you rely on your air conditioner during the warm weather months and that when your cooling system is in disrepair, it leads to lots of inconvenience and discomfort. That’s why we take a thorough, methodical approach to air conditioning service.

Get Started AC Maintenance AC Installations

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

Local Service Experts

No job is too big or small for the Harmonic Heating & Air Conditioning team — from minor repairs to system overhauls, we aim to deliver complete customer satisfaction on every project we undertake.

We also offer a wide selection of air conditioning systems at affordable prices to meet your specific needs. Contact us today to learn more and get started on your AC repair in McHenry County!

A/C Service & Repair

At Harmonic Heating & Air Conditioning, our air conditioning service contractors believe in going above and beyond to ensure your complete satisfaction. We understand that you rely on your air conditioner during the warm weather months, and for this reason, we take a thorough, methodical approach to air conditioning service. When you work with us, you'll benefit from our:

Industry Experience | Reasonable Rates | Flexible Appointments

Don't take chances with your home or business when Harmonic Heating & Air Conditioning is on hand to provide the air conditioning service you need. Call us today for more information or to schedule an estimate for AC repair service in Northern Illinois!

Choose Harmonic Heating & Air Conditioning for Your AC Repair & Service

At Harmonic Heating & Air Conditioning our HVAC contractors are focused on going above and beyond to ensure your complete satisfaction. We recognize the importance of your air conditioner during the warm months in Crystal Lake, which is why we take a thorough, methodical approach to HVAC service. Contact us today to get started on your air conditioning repair or maintenance service with Harmonic Heating & Air Conditioning!

Get Started

Five Fixes To Try Before Calling Harmonic Heating & Air Conditioning

We love helping our community with our commercial and residential HVAC services. But with a majority of our air conditioning repair calls, it turns out the problem is simple and could have been remedied easily by our customer. Here are five things to try before giving us a call that could be the quick fix your system needs:

Make sure that your thermostat is in "On" mode, set to "Cool," and that the desired room temperature is set cooler than the current ambient temperature.
Assure that your circuit breaker is "ON" for your cooling 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 AC 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 cool air, but not cooling as well as it should, check your outdoor unit to ensure there is nothing blocking airflow through the outdoor coil.