24/7 Emergency Service 847-305-2800

The Best Local HVAC Company in Northeast Illinois

Are you looking for the leading HVAC company in the Northeast Illinois area? From our headquarters in East Dundee, Lea Heating & Air Conditioning serves customers throughout McHenry, Kane, and northwest Cook counties, including the Fox Valley area.


Communities we often serve include:

Why Choose Us for Your Heating & Cooling Needs

Our experienced HVAC company has the skills and training to perform repair and installation services for all major heating and cooling equipment. We are also a Bryant Factory Authorized Dealer, so you can have peace of mind knowing your comfort systems are in the hands of tried-and-true professionals.

Do you need HVAC repairs? We’ve been in business since 1979 and we’ve seen it all when it comes to HVAC repair needs. Our team can expertly diagnose any problems with your heating and cooling equipment and offer a prompt, budget-friendly repair.

Visit Our Local Showroom in East Dundee

Lea Heating & Air Conditioning operates a beautiful showroom to display our popular HVAC products right here in East Dundee. We’re open Monday through Friday, 8:00 a.m. to 5:00 p.m., so plan your visit today! Working models for our top products are on display, helping you choose the best new heating and cooling equipment for you.

Contact Us Today for Professional HVAC Service

When you need an HVAC company that you can rely on for professional service in Northeast Illinois, get in touch with Lea Heating & Air Conditioning. Our staff will be happy to discuss your HVAC needs and get you the expert service you need to stay comfortable year-round. For more information and a free estimate, contact us today by calling 847-305-2800 or filling out the convenient online form.

HVAC Installation, AC Service, Air Conditioner Service, AC Repair & Air Conditioning Installation Algonquin, IL, Carpentersville, IL, Elgin, IL, Hoffman Estates, IL, Sleepy Hollow, IL & West Dundee, IL

AC Repair in Algonquin, IL | Air Conditioner Service Carpentersville, IL | Air Conditioner Repair Elgin, IL

Air Conditioning InstallationAC ServiceAir Conditioner RepairAC RepairHVAC Installation ∴ Algonquin, IL ∴ West Dundee, IL ∴ Hoffman Estates, IL

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What others say

I had an issue with an update on my thermostat. I contacted one local company and they had sent two guys out that had no idea what the issue was. I then contacted Lea Heating & Air Conditioning. I had the opportunity to talk with Robert and he went “way out of his way” to help me out. Outstanding customer service! He is very knowledgeable in his work, was pleasant to work with, and was reliable. Outstanding companies like this are hard to find. I will always call them first for any work that needs to be completed. I highly recommend them!

Brandon L.

Mike Lea was wonderful giving me a quote, explaining the price, discounts, the process etc. The crew was friendly, worked like a well oiled machine and explained what they to doing. I purchased a furnace, A/C, humidifier & thermostat. Everything was cleaned up when they were done and I couldn’t even tell they had been at my home. Fast, efficient and good price! I highly recommend Lea Heating & Air Conditioning.

Patti Flessner

I’m very pleased with Lea heating & Air, I had a quote done, very reasonable price, i called scheduled an appointment for whole HVAC system install, Ron & Joshua were professional very knowledgeable, never messy, after the job was complete they both explained everything to me, these two guys know what they’re doing. I would highly recommend Lea to everyone, they’re awesome!

Dorinda Fucarino

We had a new AC & Furnace installed one month ago; everything is working perfectly from day one. Mike came out initially and gave us a few options that would work with our home, was very helpful and answered all of my questions. Andy and Jordan installed our new AC & Furnace in a single day, amazing job considering we have a very cramped utility closet. Very pleased all around, I highly recommend!

Kyle Stewart

I used Lea Heating for a normal maintenance service check up in my new townhouse. They were able to accommodate an early morning appointment and kept within the time frame quoted. Duane answered my questions politely and gave me good information for future heating/cooling situations. I would use this company again.

Nancy Roozee

We have used Lea Heating services for 20 years. They repaired and maintained HVAC in our large family home in this area and replaced the furnace and air conditioner when required. Now that we downsized to our “retirement” home, we knew immediately they were the ones to call for this place too. They have always been responsive, professional and pleasant too. They provide information and answer questions, do not pressure sell and provide quality equipment. Yesterday they installed a new furnace and air conditioner in a timely manner, were considerate, clean and helpful in their approach. One gentleman even carried in some groceries for me! They left the site in tip top condition with everything working. Highly recommend Lea Heating.

Mary Loete

I highly recommend Lea Heating and Air. They are very fair priced and knowledgeable about what needs to be done. Josh and Andy installed my central air yesterday. I’m very happy with their work. Both were friendly and very efficient. They took the time to answer any questions that I had and cleaned up beautifully. Thank you again for a job well done!!

Kristi Weseman

From the estimate to the install, everything was excellent. With being a retiree from the trade world, the work was clean, started on time, finished on time, very impressed! Would highly recommend!!!

Rick Adkins

We have used LEA HEATING and cooling for 8 years,top notch company, they are on time, attention to detail and work is perfect. Clean up is best in class. Todays LEA rep was Duane, and he is a true professional. Great company.

Jon Trent

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Hoffman Estates, IL

West Dundee, IL

Elgin, IL

East Dundee, IL

Crystal Lake, IL

Sleepy Hollow, IL

Lake in the Hills, IL

Algonquin, IL

Carpentersville, IL

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