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Air Conditioning Repair in Chicago

If you’re experiencing air conditioner problems on a hot Chicago summer day, you need an AC repair team you can trust. Finding water pooling around your indoor furnace or dripping from your unit can be alarming, but should you panic if your A/C is leaking water?

Watch our quick video guide to learn what causes AC water leaks, when to turn off your system, and how Deljo Heating, Cooling & Plumbing stops indoor leaks fast before they cause water damage:

At Deljo Heating, Cooling & Plumbing, we’ve been repairing cooling systems across Chicago for over a century, and we’re ready to help you right now. From 24/7 emergency phone support for midnight cooling breakdowns to flexible next-day diagnostics, Deljo provides rapid response without surprise fees or high-pressure sales. Expect honest guidance, transparent pricing, and the trusted service of a Chicago HVAC provider backed by 100+ years of experience.

Common AC Problems We Fix

Air conditioners can break down in a variety of ways. Some are obvious, while others are subtle. Whether your system stops altogether or just doesn’t cool like it used to, we’re trained to diagnose and fix the issue quickly and correctly.

Our technicians are equipped to handle a wide range of AC repair problems, including:

  • Water leaks or clogged drain lines – Typically caused by backed-up condensate lines, cracked drain pans, or dirty coils.
  • Frozen evaporator coils – Usually caused by airflow restrictions or low refrigerant levels, which freeze your system into full failure.
  • Weak airflow or poor cooling – Often a sign of a blocked filter, duct issues, or a failing blower motor.
  • Warm air from vents – A common sign your system isn’t cycling properly or has compressor trouble.
  • Loud or strange noises (buzzing, grinding, hissing) – Noises can mean electrical issues, loose parts, or internal wear.
  • Thermostat issues – If your thermostat isn’t responding or reading correctly, it can throw your whole system off.
  • Constant cycling or shutdowns – Could point to dirty coils, faulty sensors, or even an oversized system.
  • Tripped breakers or electrical faults – These can cause intermittent cooling or full shutdowns.
  • Blower motor problems – Without proper air movement, your home won’t cool evenly.
  • Refrigerant leaks or low levels – Not only bad for performance, but also potentially harmful to the environment.

Whatever the issue, Deljo’s team has fixed it. Most problems can be resolved in a single visit, getting your home cool again without delay.

What to Expect from Our AC Repair Services

We know how stressful it is when your AC stops working, especially when you’re trying to find someone trustworthy on short notice. That’s why our repair process is designed to be clear, simple, and built around your needs.

Here’s what you can expect when you call Deljo:

  1. Call 24/7 for Live Support & Fast Dispatch – Whether you prefer booking online or speaking to a real person, we’re available whenever you need us.
  2. Free, No-Pressure Estimate – Before any work begins, you’ll receive a clear estimate with no obligations and no hard sell.
  3. Expert Diagnosis by Certified Techs – We take the time to explain the issue and your options so you can make informed decisions.
  4. Same-Day Repairs – Our trucks are fully stocked, allowing us to complete most AC repairs in just one visit.
  5. Follow-Up and Guarantees – We stand behind every job with real guarantees and follow-ups, because your long-term comfort matters.

From first contact to final follow-up, our goal is to make your air conditioner repair experience as smooth and stress-free as possible.

Things to Check Before You Call

Sometimes the fix is simple, and you can save yourself a service visit just by checking a few things. We’re happy to help, even if that means you don’t end up needing us today.

Before you schedule your AC repair, take a quick look at:

  • Thermostat Settings – Make sure your system is set to “cool” and the temperature is set below the current room temperature.
  • Air Filter – A dirty or clogged filter can restrict airflow and freeze the system.
  • Circuit Breakers – If your breaker has tripped, your system won’t turn on at all.
  • Outdoor Unit – Leaves, dirt, and debris can block airflow and cause the AC to overheat.
  • Vents and Registers – Blocked or closed vents can affect cooling efficiency throughout the home.

Still having issues? Don’t worry. Our expert team is just a call away, and we’re ready to step in when DIY doesn’t cut it.

Why Homeowners Choose Deljo for AC Repair in Chicago

When it comes to choosing an AC repair company, the details matter. You’re inviting someone into your home, trusting them with your comfort, safety, and money. At Deljo, we’ve spent generations earning that trust.

Here’s why more Chicago homeowners choose Deljo over anyone else:

  • 24/7 Emergency Support – Our phone lines never close. Whether it’s midnight or a holiday weekend, we’ll be there.
  • 5-Star Reviews – Thousands of happy customers can’t be wrong. We’ve earned top ratings for service, speed, and professionalism.
  • 100+ Years in Business – Our longevity speaks volumes. We’ve been solving Chicago’s heating and cooling problems since 1922.
  • Instant Online Quotes – Skip the back-and-forth. Our online quote system gives you fast answers without the hassle.
  • Special Financing Available – We offer flexible payment plans through trusted partners, so comfort is always within reach.

We’re not just another HVAC company. We’re a part of Chicago’s fabric. And when your AC is down, we’re the team that shows up, solves the problem, and earns your trust for life.

Ready to Get Comfortable Again? Schedule Air Conditioning Repair Service Today

Don’t suffer through another hot day with a broken AC. Whether you’re dealing with a sudden shutdown or a system that’s slowly losing its edge, Deljo is here to help, quickly, professionally, and affordably.

When you call Deljo, you get more than a repair. You get peace of mind. With free estimates, instant online quotes, and special financing options available, we make it easy to get the service you need on your terms. No games. No surprises.

Choose how you want to get started:

Page Updated on September 30, 2026

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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