Service vehicle for Illiana Heating & Air Conditioning in Cedar Lake, IN.

When those cold Midwest winters come rolling through, a heating system expertly installed will reliably keep your family warm and energy bills low.

With our professional service and installation, you can expect a system that offers exceptional home cooling and comfort with quiet operation and efficiency.

Increase your efficiency, lower your bill, and control your home’s temperature from anywhere. Breathe a breath of fresh air with quality products.

The BEST way to keep your home comfortable! Extend the life of your existing system with a precision tune-up.

Illiana Heating & Air Conditioning team in front of company service vehicles in Crown Point, IN.

WE go

Above and Beyond

To serve You

Since 1987, we’ve been helping folks throughout the Lansing and Northwest Indiana area enjoy total indoor air comfort in their homes and businesses. Nationally recognized as both the Residential Contractor of the Year and the Best Contractor to Work For, Illiana cares about its employees as much as its external clients.

Testimonials and Reviews

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“Great service. Helpful office staff. Tech was very friendly did good job and left work area clean. Always good experience working with them. Have recommended to others.”

Dan Hayes

- Dan H.

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“Excellent service and very polite and friendly. I also appreciate the effort by ILLIANA Heating and Air Conditioning Management to ensure my safety by sending a photo and name of the service technician BEFORE he arrives at my home so I can ensure I am safely letting in the correct person to resolve my heating and/or cooling issue. I highly recommend ILLIANA Heating and Air Conditioning!”

Rich Flahaven

- Rich Flahaven

Goldstar membership icon for Illiana Heating & Air Conditioning's HVAC maintenance program.


Get to the front of the line and make maintenance a breeze with a Goldstar membership, only from Illiana Heating & Air Conditioning. With a Goldstar membership contract, not only will you guarantee yourself the great service of our professionals, you’ll also receive the following benefits:

Guaranteed demand service appointments within 24 hours

Included preventive maintenance visits for your covered equipment

Never charged overtime service calls or rates

At least a 15% discount on repairs and consumables

Latest tips and tricks

Does an AC Kill Mold? Employee hand in rubber protective glove with microfiber rag wiping blue table, wall or floor surface in room, bathroom, kitchen.

Does an AC Kill Mold?

May 17, 2024

Your air conditioner (AC) can do several things––keep your Indiana home’s indoor air cooler than outdoor temperatures, help to keep indoor airborne allergens at bay, and help keep your home’s humidity low. But one thing it can’t do is kill mold. 

Planning to Remodel? Go Ductless! Living room with red sofa and air conditioner - 3d rendering.

Planning to Remodel? Go Ductless!

April 30, 2024

A ductless system, also known as a mini split, can add comfort to areas of your Indiana home where ductwork cannot reach. Whether you are remodeling or adding new living space, our team at Illiana Heating & Air Conditioning, Inc. is ready to assist.

Whole family are sitting on the front of the ventilators.

3 Signs It’s Time For a New AC

April 15, 2024

Deciding on the ideal time to replace your air conditioning system in St John can be a challenge, so here are three areas our Illiana Heating & Air Conditioning professionals suggest you monitor for telltale signs:


Need financing?

Illiana Heating & Air Conditioning has you covered!

We understand how tricky it can be when your HVAC system breaks down. We partner with Wells Fargo, Ally, and Fortiva to provide financing options so we can help relieve some of the stress. You may qualify to finance a new system installation or repair service. Go to the website below and complete the application form to find out what you are eligible for.

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Adding or replacing a heating and cooling system affects your finances as much as your home comfort. Fortunately, we’ll help you take advantage of monthly promos and specials Illiana Heating & Air Conditioning is offering.

Coupon for  OFF REPAIR. Only valid toward repairs. Restrictions may apply. Call for more details. 219-627-1589

Join the Illiana Team!


Illiana Heating & Air Conditioning service vehicle with company truck wrap.