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Furnace Maintenance in Chicago, IL

Furnace Maintenance in Chicago, IL

Every homeowner should already know that regular maintenance of their heating system improves efficiency and prolongs the life of the system. Furnace maintenance in Chicago isn’t just highly recommended; it’s essential for both your physical and financial well being. Deljo is ready to help maintain your service from Lincoln Park to Irving Park and throughout the Chicagoland area.

When money is tight, it makes sense to wonder, “Is furnace maintenance really necessary?” But with roughly a century of experience in the heating and air conditioning world, we know that yes, without a doubt furnace maintenance is necessary.

Skipping your annual maintenance might save you a couple of bucks today. But doing so allows your heating system to slowly degrade. Its efficiency will suffer, forcing your energy bills to rise.

In the U.S., heating accounts for more than 40% of the energy used in homes. With that in mind, it’s easy to understand how much of a difference furnace maintenance in Chicago can make. Plus, ignoring your system greatly increases the likelihood of a costly furnace repair.


Furnace Maintenance Tips That’ll Help You Stay Warm This Winter

As temperatures slowly start to transition from warm and summer-like to a more brisk and dry Fall, it’s time to start thinking about your furnace. You’ll want to make sure it’s ready to go whenever you’re finally ready to crank the heat on. Here’s just a few things you can do to prepare for the cold months ahead:

Change Your Air Filter:

This will optimize the flow of air throughout your living space, and catch any new dust or debris that tries to enter your system.

Understand The Type Of Heater You Have:

Numerous older homes across the Chicagoland area means there are a variety of heating and cooling systems unique to each property. From radiators and oil systems to electrical and gas furnaces, knowing what type of heating system is in your home is helpful for maintenance and future repairs.

Keep Plants And Objects Away From Your Furnace:

This will not only protect your belongings from being damaged by your furnace when it’s in operation, but also gives a clear path for HVAC technicians to inspect your furnace in the future.

Check Your Pilot Light:

If your furnace’s pilot light flame is blue, then that means your system is working properly. If the flame isn’t visible or another color, like orange or yellow, then it’s time to call a professional to check your furnace.


Call Deljo For Furnace Maintenance And Repairs

Don’t wait until the first 30 degree nights to make sure your furnace is fully operational! Get it checked now to save yourself from future breakdowns and costly repairs. Contact Deljo Heating, Cooling & Plumbing today for help! Call 773-829-4295.


With advances in technology over the past several years, furnaces have changed quite a bit. As a result, the standard furnace service of years past would pale in comparison to what’s needed to keep modern furnaces running at an optimal level.

At Deljo Heating, Cooling & Plumbing, we’re commitmented to providing the best customer service and furnace service in Chicago, IL and the surrounding communities. Our technicians train continuously to maintain their expertise in all of the newest furnace technology.

So whether you have a single-stage, two-stage, or modulating furnace, our pros are ready to help. From furnace maintenance to repairs, even new furnace installations in Chicago, Deljo is the name to trust.

Tips To Reduce Heat Loss & Save Money On Your Furnace

1. Set Your Thermostat Back When You Don’t Need It

If you won’t be home for a while or can withstand a slightly lower temperature in your home for a few hours a day, lowering the temperature in your home for a few hours everyday helps save you money in the long run.

2. Properly Calibrate Your Thermostat

Ensure your thermostat is calibrated appropriately by comparing it with an accurate thermometer. If the variance is +/- 3°F, that is acceptable. If it is more than that, your thermostat may require service.

3. Allow Sunlight Where You Can

Keep your shades open during sunny days to allow as much sunlight to enter your home as possible. At night, keep them closed to reduce the chill from cold windows.

4. Seal Air Leaks

Air can leak around your door and windows if not well sealed. Sealing these air leaks can help you save up to 10% on your heating bills.

5. Check & Seal Your Ducts

Avoid adding hundreds of dollars a year to your heating bills by ensuring your ducts are not leaking air into any crawl spaces.

6. Inspect Your Insulation

Insulation between your walls helps keep your home warm all winter long. If your insulation is insufficient, your heating system will have to work overtime to keep your space warm.

Contact Us
Need your furnace serviced for the winter? Contact Deljo Heating, Cooling & Plumbing in Chicago and leave it to trusted professionals who have been on the cutting edge of HVAC since 1922.


Our furnace service in Chicago includes, but is not limited to:

  • Inspecting your heat exchanger for cracks or deterioration. Safety
  • Testing all safety controls for proper operation. Safety
  • Testing exhaust vents for proper air flow. Safety
  • Measuring carbon monoxide levels in the home. Safety
  • Inspecting natural gas lines for leaks. Safety
  • Inspecting line voltage switch and wiring. Safety
  • Inspecting furnace for signs of dirt, mold and mildew. Safety
  • Measuring relative indoor humidity. Safety & Performance
  • Replacing air filters upon request. Performance
  • Cleaning burners and pilots. Performance
  • Inspecting blower motor and wheel for debris. Performance
  • Cycling and visually inspecting all operating controls. Performance

Upon completion of the service, our technician will provide you with a written report of the work they performed. This report will also include any issues that the technician found as well as their recommendations for moving forward.

Rather than paying to service your furnace and air conditioners separately, consider our Gold Star HVAC maintenance plan. Doing so can save you money on maintenance, repair service and more.

Professional, Personalized Furnace Service for Chicagoland

With our furnace service, your burners will be pulled and cleaned. To ensure the best possible efficiency, we can adjust your heat-off delay. Our professionally certified HVAC technicians will also provide you with a detailed combustion analysis. This report measures efficiency, allowing us to identify potential issues to reduce energy costs and keep you safe.

But that’s not all.

Our technicians will check the oxygen levels of your furnace and fine tune them for optimal performance. The factory settings for oxygen levels on furnaces are usually a touch too high to provide maximum efficiency. We make sure your furnace’s performance doesn’t suffer from such a simple oversight.

In addition to oxygen levels, we also test carbon monoxide levels. CO affects the performance of your furnace. But more importantly, it can be incredibly dangerous to your health if the levels get too high. Our technicians will measure your CO levels and inspect your furnace for any signs of leaks to ensure your system’s integrity and your family’s safety.

And for customers with older units, we’ll do all we can to extend the life of your furnace and keep it running in peak condition for the remainder of its life. That said, you may want to consider upgrading to a newer, more efficient model. There’s a good chance that doing so could actually save you money in the long run thanks to their reduced energy consumption.

Find out why we’ve been serving Chicago’s Heating Needs Since 1922!

Advanced technology in residential furnaces has made heating much more affordable and efficient. But we’ll be the first ones to tell you that it’s also made furnace service a lot more complicated. That’s why you should leave it to trusted professionals who have been on the cutting edge of HVAC since 1922.

Give us a call at (773)829-4295, and join your neighbors as a satisfied Deljo customer.

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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