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Free Water Heater Inspection with a Furnace Tune-Up

Air Conditioning Tune-Up Service in Chicago

When the summer heat hits, you need cool air fast. Chicago residents trust Deljo Heating, Cooling & Plumbing to keep their air conditioners efficient, dependable, and ready for summer. Call us today at 773-280-8251 or schedule your AC tune-up online, and see why we’ve been trusted for this kind of work since 1922.

If you’d like to learn more about our air conditioning tune-ups before scheduling service, keep reading.

Why AC Tune Ups Matter

An AC tune-up is a comprehensive inspection, cleaning, and testing of your cooling system. Air conditioner manufacturers recommend annual tune-ups to keep systems running efficiently and reliably. Many air conditioner warranties require annual professional maintenance to stay valid. Aside from maintaining your warranty, regular maintenance will also:

  • Extend your equipment’s lifespan.
  • Help your AC operate more efficiently, saving you money and keeping you more comfortable.
  • Help you avoid costly and inconvenient breakdowns.

If these benefits sound like something you’d like to experience for yourself, call us or contact us online.

What Our AC Tune Ups Include

During your appointment, a Deljo technician performs a start-to-finish service that combines careful inspection with precision adjustments. Before the steps outlined below, we’ll ask you about …

  • Any hot/cold spots
  • Unusual noises
  • Recent repairs

Then we move through a detailed sequence that includes the following six steps.

System safety and controls

We verify thermostat operation, cycle the system from off → cool, and confirm all safety devices function correctly. We also inspect disconnects and electrical panels for wear or overheating.

Electrical and mechanical health

We tighten electrical connections, measure voltage and amperage draw, and test capacitors, contactors, and relays. We inspect the blower motor and fan for correct rotation and balance to prevent premature wear.

Airflow and filtration

Proper airflow and filtration go a long way towards superior comfort and efficiency. To evaluate this, we check static pressure (where applicable), check the blower wheel and housing, and inspect your air filter, replacing it if necessary.

Coil and condensate performance

We inspect and clean accessible condenser fins and check the evaporator coils’ condition. Then, we clear and treat the condensate drain to help prevent water leaks and clogs. This can dramatically improve system performance.

Refrigerant evaluation

We measure operating temperatures and pressures under load and compare them to specifications for your system type. If readings suggest a refrigerant issue, we’ll explain your options before performing any additional work.

Final performance test

We document supply/return temperatures, verify even cooling where zoning applies, and provide a written summary with recommendations so you know exactly how your system is performing today and what to plan for next.

Have a ductless mini-split or a zone control system? We offer AC tune-up services for those, too.

What Makes Deljo Different

Deljo has served Chicago for over a century with thousands of 5-star reviews. Homeowners choose us for our seasoned technicians, straightforward recommendations, and dependable service culture. We offer 24/7 emergency support & priority dispatch.

If something seems off between visits, our AC repair team is ready to help. For urgent situations, our emergency HVAC services are available day or night.

The smartest way to protect your system is to enroll in Deljo’s Gold Star preventative maintenance program. Members enjoy routine tune-ups, priority scheduling, and ongoing peace of mind.

Schedule Your AC Tune-Up in Chicago Today

Deljo makes it easy to prepare your system for the first 90-degree day. If you’re ready to schedule service and experience the benefits we’ve discussed here for yourself, call us at 773-280-8251 or fill out our contact form.

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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