We’re growing! WELCOME CLIMATE MASTER MECHANICAL CONTRACTORS CUSTOMERS!
Providing Comfort and Expert Service Since 1927


Over 90 years ago, Fred Doornbos started his heating business. Fred’s philosophy was to do only quality work and the referrals would eventually keep him busy. Fred was right. One job led to another, and today our reputation for quality work continues, as does our philosophy. At Doornbos, it is all about quality workmanship.
We uphold the old-fashioned values which have built lifelong and multigenerational relationships with our customers. At Doornbos, we recognize that honesty, integrity, and personalized attention are as important as expert workmanship and unmatched products.
Our professional standards ensure quality results on every project Doornbos performs. Doornbos guarantees satisfaction.

Maintenace from Doornbos Heating and Air Conditioning










Check out our Award Winning Year - see all we accomplished!
Air Conditioner Maintenance in Chicago, IL 60628
Air Conditioner Maintenance in Oak Lawn, IL, 60453
“Mark was prompt, courteous and efficient. He explained the work he was doing and answered my questions. I was very impressed with Mark and would gladly have him back.”
– Geraldine W.
Air Conditioner Maintenance in Chicago, IL 60652
“I was very satisfied with the service and expertise Mark provided in servicing my air conditioning. I most appreciate the flexibility in scheduling around my work hours.”
– Robin A.
Air Conditioner Maintenance in Chicago, IL 60628
“The technician was professional and friendly. He arrived on time and completed the job in a timely matter. He was respectful of my property as he entered and exited to perform maintenance on my air conditioner. He advised be that no problems were found and that everything appeared to be functioning correctly. He asked if I had any questions, and I did not have any. The experience was one that I felt comfortable with him being in my home.”
– Katie S.
Air Conditioner Maintenance in Oak Lawn, IL, 60453
“Mark was prompt, courteous and efficient. He explained the work he was doing and answered my questions. I was very impressed with Mark and would gladly have him back.”
– Geraldine W.
Air Conditioner Maintenance in Chicago, IL 60652
“I was very satisfied with the service and expertise Mark provided in servicing my air conditioning. I most appreciate the flexibility in scheduling around my work hours.”
– Robin A.

OUR PROMISE TO YOU
We promise to maintain our long tradition of excellence by giving you our guarantees of professionalism in service, technology, installation, and people.

SERVICE
Factory-authorized, NATE- and EPA-certified technicians are ready to serve you 24 hours a day, every day.

INSTALLATION
Our quality standards are high and our installers adhere to our long tradition of fine workmanship. We are proud of every job we do.

TECHNOLOGY
Our industry has come a long way since 1927, and we have been on top of it all the way. Our advanced technology in servicing, installing, and testing helps us bring you the best for your money.

PEOPLE
Doornbos employees are knowledgeable, hardworking, good people focused on doing a superior job. We take pride in our work and the company’s reputation for customer satisfaction. Every Doornbos employee has ongoing continuous training to remain on top of our field.
When thinking about replacing your home heating and cooling system, be sure to purchase properly sized equipment for your specific home.
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