Furnace Maintenance, Repair & Installation

We provide professional installation for your new furnace at an affordable price. We use quality materials and experienced technicians to ensure that your furnace is installed correctly, securely and safely. Our team of professionals will make the process as easy and hassle free as possible by taking care of all the details from start to finish.

We understand that a new furnace is a big investment, so we are committed to offering discounts, specials and rebates to our customers. You can be sure that you’ll get the best value for your money when you choose us as your furnace installation provider.

Our technicians arrive on time, provide polite and friendly service, and take all necessary precautions to ensure that your home and property are respected throughout the installation process. After the job is completed, our team will leave the work area clean as a sign of respect for you and your home.

We make it easy for Crystal Lake, McHenry and Northern Illinois home owners to get a new furnace installed quickly and affordably. With our team of experienced technicians and commitment to customer service, you’ll be sure to have a pleasant experience with us. Contact us today at 815-220-5125 or request an appointment for more information about our furnace installation services!

Basic | A801E CT

A801E CT Armstrong Air Furnace

Bronze | A951E

A951E Armstrong Air Furnace

Silver | A802V

A802V Armstrong Air Furnace

Gold | A962V

A962V Armstrong Air Furnace

Platinum | A97MV

A97MV Armstrong Air Furnace

How much does it cost to replace a Furnace?

The size of your home is a major factor when determining the price of a new furnace. Furnaces come in various sizes, each designed to heat an area up to certain square footage. The AFUE (Annual Fuel Utilization Efficiency) rating also affects the price and can range from 80% to 97%, with higher numbers indicating greater efficiency and lower energy costs. An 80% efficient furnace will cost less but be much less efficient than its higher-end counterparts, resulting in 20% of your energy costs going straight up the chimney. On the other hand, 96%-97% efficient furnaces are more expensive but they are able to retain more energy and thus require only 3-4% waste escaping out of your home’s chimney. One-stage furnaces will be either on or off and provide no option to reduce energy consumption. However, upgrading to a two-stage or variable speed furnace can help you save on both gas and electric bills as it runs at a lower RPM. Additionally, high-efficient systems often offer utility rebates which makes the switch easier financially. Lastly, many companies provide financing options such as seasonal rebates, discounts, and same-as-cash financing.

Rock*Star Plans for Your Home

We are now a certified Armstrong Air Pro Team Member

We are now a certified Armstrong Air Comfort Team

Financing with SERVICE FINANCE Company is Available

Click the buttons below to apply for financing.

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Get Your Exclusive 12-Year Warranty with the installation of any full system and by joining one of our Rock*Star Maintenance plans!


We customize your comfort by making your home smarter, healthier and more efficient. Your peace of mind is as important to us as your comfort.

That’s why every product us backed by warranties as robust and dependable as the products themselves.

Every piece of heating & cooling equipment is eligible for a 12-Year Parts Warranty, when you join ANY one of our 3 “Rock*Star Maintenance Programs”.

All other products are eligible for the 12-Year Parts Warranty.

Ask for details, terms, and conditions. All product warranties are registered by Official within 30 days of purchase.

on all equipment repairs, indoor air quality comfort items

Including humidifiers, air filters, air cleaners, thermostats and more! 12 year parts and labor warranty requires joining ANY one of our 3 Rock*Star Maintenance Programs. Ask for details, terms, and conditions.

The “Exclusive 12-year Parts & Labor Warranty” covers parts and labor cost from the time of purchase. “Exclusive 12-year Parts & Labor Warranty” requires annual maintenance to be performed by Official Heating & Air Conditioning beginning immediately from the time of purchase. Maintenance must be performed annually during the initial 12-year coverage term in order to uphold warranty status. If annual maintenance is missed or not performed by Official Heating & Air Conditioning, the “Exclusive 12-year Parts & Labor Warranty” becomes void immediately. Warranty coverage defaults to a 10 year part warranty and a 2 year labor warranty from the time of purchase. Warranty is registered to the purchaser and is not transferable.


when you purchase a Furnace or Air Conditioner from Official!

At Official Heating and Cooling, we are proud to be one of the leading companies for furnace installation in Crystal Lake, McHenry, the northwest Chicago suburbs, and their surrounding communities. Our goal is to provide our customers with the highest level of satisfaction possible by not only installing a reliable furnace but also providing comprehensive maintenance services that cover all aspects of service required for your system. From minor repairs such as duct work to labor and equipment costs associated with installation or replacement projects – we have you covered! Our maintenance agreements provide peace of mind knowing that we can take care of any issue that may arise so your family can enjoy a safe and comfortable home environment. With over 65 years of experience in the industry, you can rest assured that when you choose Official Heating and Cooling, you are getting the best service possible. Contact us today to learn more about our furnace installation services!

Harmonic Heating & Air Conditioning is your furnace expert! We can take care of any furnace 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

Furnace Cleaning

Are you having trouble regulating the temperature in your home? Are you noticing a sharp increase in your gas bills? Is your furnace struggling to keep up with the cold weather? If so, then it may be time for a tune-up! Our annual service can help get your furnace back up and running in no time. Call us today to find out how much it will cost and start enjoying the benefits of improved heating performance right away!

Why Replace Furnace the Aging Furnace in Your Home?

Once the furnace installation is complete, we will be there to help you maintain it so that your furnace functions optimally and lasts as long as possible. Our expert service professionals are here to keep your furnace running better and longer.

When selecting a new furnace for your home, our Furnace sales staff can design the most energy efficient, comfortable heating system that fits into your budget, desires and lifestyle. We factor in structural requirements of your home, allergies and any respiratory issues that may arise when making our recommendations. Our experts will guide you through this decision-making process so that you’re aware of all available options.

For added convenience and ease of ownership, numerous affordable options will be made available to you with our installation service. What’s more, our speed and efficiency will ensure that the job is done in the best manner possible – no matter what time you need us to work!

Furnace Repair

As the colder months approach, it’s essential to have your furnace inspected or repaired by an experienced professional from Official Heating & Air Conditioning. With our extensive experience and affordable repair services, you can rest assured that your home will be comfortable during winter without having to worry about any malfunctions. Our team of certified technicians is available round-the-clock for all types of furnace repairs, so don’t hesitate to give us a call if you need assistance! We provide quality service at competitive prices, ensuring maximum comfort and satisfaction with every job we complete. Contact us today to schedule an appointment and get your furnace ready for winter!

Here are just a few of the reasons why you should choose Official 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


Armstrong Air Furnaces