Commercial HVAC Service

Air Conditioning, Heating, & Air Quality Services in McHenry County

Commercial HVAC Service From Harmonic Heating & Air Conditioning

Keeping your employees and customers comfortable is important to your business. A broken furnace or air-conditioner at your office is costing you money in lost productivity and sales. No one wants to work or shop while sweating or freezing. We get that. If you came into work this morning and discovered that your business is without heat or your air-conditioner needs repair, it’s time to reach out to our pros at Harmonic Heating & Air Conditioning today!

Harmonic is your local air conditioner replacement expert!
Schedule your AC estimate with Harmonic today.




plus regular flat rate


single unit

plus materials
custom contracts available


single unit

plus materials
custom contracts available


per hour

1 hour minimum
charged by 1/4 hour after 1 hour
parts and materials extra


per hour

1 hour minimum
charged by 1/4 hour after 1 hour
parts and materials extra



1 hour minimum
charged by 1/4 hour after 1 hour
parts and materials extra

Do You Need Commercial AC or Heater Repair?

Our trucks are stocked with the tools and parts you need to help your business get back to normal quickly. We fix all brands of commercial furnaces and air-conditioners for all types of commercial spaces, including:

  • Office
  • Retail
  • Warehouse
  • School
  • Medical
  • Multi-unit residential
  • Industrial

If your building is in the McHenry County or Northern Illinois area, let Harmonic Heating & Air Conditioning help you get your heat back on or your air-conditioner running quickly. Our customers’ comfort is our highest priority.

Roof-Top Unit and Other Commercial Equipment Replacement

It doesn’t matter what size unit or how many units your building requires, we can help. We work with all major brands of RTUs, Boilers and Commercial Water Heaters so we have options to fit any building owner’s budget.

Commercial Boiler Services

We work on all types of boilers and hot water heat systems. It’s important to regularly check your system for signs of wear to increase its lifespan and decrease your energy bills.

Book Your Service

Commercial Maintenance Services

You have more important things to think about in your business than your HVAC system. That is, until things break. Keep your business running smoothly and hassle free with a Custom Preventative Maintenance Plan for your building’s HVAC system.

Let us take a more active role in keeping your systems in top shape. Regular maintenance is proven to make your investment last longer. Plus, preventative care means fewer breakdown and disruptions to your business.

Our contracted commercial customers receive special pricing and priority service.

Roof-Top Unit Maintenance

Maintain your investment with regular service checks from Harmonic Heating & Air Conditioning. Our RTU check includes…

Labor only, parts & material extra.(Three or more units – billed at time & materials commercial rate of $100/hour)

RTU Furnace Maintenance Check

  • Inspect and clean burners and ignition components
  • Clean interior of cabinet
  • Clean blower housing for greater efficiency
  • Inspect heat exchanger for safety
  • Inspect exhaust for safety
  • Inspect all electrical components for wear
  • Test motor and capacitor for operation
  • Inspect and test all safety devices
  • Check belt tension and adjust if necessary

RTU AC Maintenance Check

  • Chemically clean the condenser coil for greater efficiency and lower energy bills
  • Clean existing outdoor air filter for better air flow
  • Test and check unit for all operations
  • Check refrigerant levels (refrigerant cost extra)
  • Replace all necessary filters and fan belts

Contact Harmonic Heating & Air Conditioning for commercial HVAC services in the Crystal Lake area and across Northern Illinois.

Get Started

Our Installation Process

Our Installation Process

Rock*Star Maintenance Plans

Our annual maintenance programs at Harmonic Heating & Air Conditioning provide a Smarter, Healthier, more Efficient home by providing the best heating and cooling systems on the planet.


$19 Per Month

$228 Annually

Best Value

$29/mo or $348 Annually

$456 Annually


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