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What to Expect From Your Heating Maintenance Inspection

If you’re looking for the best service for heating in Chicago, IL, you’ve come to the right place. Whatever the situation or problem, the professionals at Deljo Heating, Cooling & Plumbing are prepared to handle any of your furnace needs.

You rely on your furnace to keep your home or business warm and comfortable all winter long, and that’s why an annual inspection from experienced HVAC professionals is so important. A professional inspection provides several key benefits.

  • With proper maintenance your furnace operates efficiently, reducing energy waste and saving on heating costs.
  • An annual inspection by a qualified professional helps extend the life of your furnace by preventing damage to vital components.
  • During an inspection, small problems can be identified and addressed before they become major issues.
  • Regular inspection helps prevent safety issues like the risk of fire and carbon monoxide leaks.

What does a furnace inspection include?

An inspection conducted by one of Deljo’s Nate certified technicians will include the following:

  • Checking the vent system for leaks or blockages.
  • Examining the heat exchanger for signs of corrosion and cracks or separations. A damaged heat exchanger can allow deadly carbon monoxide gas to escape.
  • Checking the blower and cleaning its components, including the blower wheel to make sure it’s free of dirt and debris.
  • Testing for a tight seal on the blower access door.
  • Checking the air intake grills for blockages.
  • Checking the burner for proper ignition and testing the flame sensor for accurate operation.
  • Lubricating the motor’s moving parts to reduce friction. Friction causes the motor to work harder, using more electricity and possibly leading to premature failure.
  • Checking to make sure all electrical connections are tight and examining the wiring for signs of corrosion.
  • Checking the belts for signs of wear or cracks.
  • Examining the flue for obstructions. If the toxic fumes produced by combustion cannot escape up the flue, that will compromise indoor air quality.
  • Testing the thermostat calibration.
  • Test to make sure the furnace’s startup cycle is functioning properly.
  • A written report on findings and recommendations.

These are some of the steps our technicians will take to make sure your furnace works properly during Chicago’s long winters. Check out our Gold Star Program, and for the very best in inspection and service for heating in Chicago, call Deljo Heating, Cooling & Plumbing today at 773-829-4295.

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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