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Servicing Your HVAC in Chicago, Illinois

If your house seems warm enough in winter and cool in the summer, you might well ask why your HVAC system needs any service. Actually, there are several reasons, and Deljo Heating, Cooling & Plumbing offers the very best HVAC service in Chicago.

Here are just a couple of reasons why you should have your HVAC system inspected and cleaned on a regular basis.

Energy Savings

According to the U.S. Department of Energy, 25 to 40 percent of the energy used for heating or cooling is wasted. Contaminants in the heating and cooling system cause it to work harder and shorten the life of your system. When your HVAC system is clean, it doesn’t have to work as hard to maintain the desired temperature, and less energy is used.

Indoor Air Quality

Airborne contaminants, such as dust, dander, bacteria, mildew, decaying organic matter, viruses, residue from chemicals, pollen, and much more, get pulled into your ductwork every time your system is on. If you and your family are having issues with allergies, asthma, respiratory illnesses, or even frequent cold symptoms, it could be time for air duct cleaning.

So, even if you haven’t noticed any heating or cooling issues in your home or office, you should call Deljo Heating, Cooling & Plumbing and let our expert technicians inspect, clean, and, if necessary, repair your HVAC system.

HVAC Inspection

An air duct inspection determines if there is a need for cleaning and the level of cleaning that’s required. We also perform an air duct leakage test, a first step for proper air duct cleaning. We report our findings back to you before we go forward with the cleaning. This test is important to prevent the same issues from happening again once your air ducts are properly cleaned.

Cleaning

After their inspection, our technicians will give your HVAC system a thorough cleaning, and all dirt, grime, and contaminants will be collected in our equipment for environmentally safe disposal.

Repair

Unless they are properly installed, your air ducts will not stay clean. Our technicians can correct installation problems, making sure your system remains clean and is running efficiently for years to come.

Financing Your New HVAC

We understand that the final price tag of a new system might not fit your current budget. That’s why we’re pleased to offer finance options if needed. Please contact our customer service team today to learn more about breaking up the payments for your new system.

Addressing All of Your HVAC Needs In Chicago

Rest assured that all of our NATE-certified HVAC technicians are trained, insured, and will act professionally during your appointment with us. Your time and comfort are of the utmost importance to us, which is why we will arrive and operate in a timely and efficient manner.

We’ve been Chicago’s premier HVAC contractor for almost 100 years because of the quality of our services and the professionalism of our certified technicians. Whether you need an HVAC tune-up or a completely new HVAC unit installed in your home, Deljo’s technicians will make sure all of your questions and concerns are addressed before we leave.

At Deljo Heating, Cooling & Plumbing, our expert technicians are also available 24 hours per day, 7 days per week for emergency HVAC services. We urge you to email or call us at 773-829-4295 for the very best HVAC service in Chicago.

Client Testimonials

Read the opinions of our satisfied customers.

5 stars

This was my first time as a Deljo customer, and I was very pleased. My technician, Giovanni, was very thorough and diligent. He serviced my furnace and identified a faulty sensor that was causing the unit to shut itself down. Deljo ordered the part, and Giovanni replaced it a few days later. Overall, the team at Deljo was great. The dispatcher kept me informed about Giovanni’s arrival time, and the supervisor assisted Giovanni when he was diagnosing the problem with the furnace. I highly recommend Deljo.

Paul D. 10/15/2026

5 stars

I’ve used Deljo for over 10 years now and they always do a good job. Izzy was the technician for this visit and he did an excellent job with my winter maintenance on my multiple units in the household. He also addressed an issue while cleaning the furnace blower wheel. His communication was clear and concise with what he planned to do to address the issue quickly. He was confident and I had 0 concerns or questions. Great job Izzy!

Jeff S. 10/14/2026

5 stars

Paul was great! Arrived on time and completed maintenance on my humidifier, tankless water heater, and two furnaces. All work was performed under my Gold Star maintenance program, so all maintenance charges were covered. Paul did provide a few proposals for additional services on furnace & tankless water heater, but those were emailed to me for further consideration. Paul was friendly, knowledgeable, and answered all my questions.

Jack N. 10/12/2026

5 stars

Gabe did an excellent job with our annual service visit. He arrived in the early part of our service window, was friendly and knowledgeable, and got the work done in a very reasonable amount of time. I have great confidence in Deljo, and am a long-time customer.

Ruth C. 10/9/2026

5 stars

I’ve been using Deljo for 20 years for HVAC but now venture into enlisting their plumbing services. Bashar was very courteous, efficient & informative, and I’d definitely request him again for the next plumbing job. Great experience!

Christopher R. 10/2/2026

5 stars

Working with Deljo is always a good experience, and today’s appointment with Izzy was no different. He was able to come early which actually worked better with our schedules, but called me ahead of time to make sure that was okay. He was friendly and knowledgeable when he explained the work he had done during his visit and our options for fixes. He was also able to schedule a quote appointment for us while he was still here. We would highly recommend working with Izzy and the Deljo team!

Lauren H.  9/25/2026

5 stars

Drew performed the seasonal maintenance on my AC. It needed some repairs and updates and he was able to fix everything at the same appointment. He also noticed issues with the hot water heater and we were able to get ahead of that, as well.

Emily W. 9/11/2026

5 stars

I would leave six out of five stars if I could! My technician Jorge went above and beyond on his service. There was buildup in the rental property’s toilet from the previous tenant. One maintenance person did a surface level job of cleaning but did not fully remove the obstruction. Jorge went above and beyond and came to a solution and even explained the perpetual problems older toilet models can cause. Moving forward with this insight, I can perform my own upkeep the previous tenant did not. Thank you kindly!

Kayla K.  9/15/2026

5 stars

We just had our new boiler installed by Jonathan and Carlos. First rate work! They arrived on time, removed the old boiler, installed the new unit, and explained the features. Both guys were pleasant. Bring on the cold this winter! We are ready thanks to the team from Deljo.

Edward B.  6/26/2026

5 stars

Deljo’s heating and cooling team was awesome to work with. As a first-time homeowner, I really appreciated how clearly they explained everything and answered all my questions. From the quote to the install and follow-up, the service was top-notch. Highly recommend!

Lindsey A. Chicago, IL

5 stars

Matt did an amazing job. He serviced our home and our rental property. He gave us options to help our systems run more efficiently. He also told us about Deljo’s new plumbing inspection which was very affordable. He is great!

Jordan R. Chicago, IL

5 stars

We had a problem with our Humidifier and called Deljo. Jesus came out to help and was amazing. He was extremely knowledgeable, detail oriented, and super courteous. Amazing customer experience!

Jeff C. Chicago, IL

5 stars

Jordan and Jesus were extremely helpful and knowledgeable! We would 100% work with them and have them back. They were both very professional and efficiently fixed our heating system.

Emily L. Chicago, IL

5 stars

Shout out to Ernesto for coming out and servicing our furnace and air con. Deljo provides a great service and glad to trust them with our HVAC for our small business.

Lauren H. Chicago, IL

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