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Heating

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Heating Services

When Chicago winters hit, a reliable heating system isn’t just a luxury. It’s essential. For over 100 years, Deljo Heating, Cooling & Plumbing has been a trusted provider of heating services in Chicago, Park Ridge, and nearby suburbs. From fast repairs to complete replacements, our expert team delivers dependable heater service and lasting comfort for your home.

We offer a full range of heating and furnace services. All of our services are performed by licensed, NATE-certified technicians who put your comfort first. If you would like to schedule heating services today, call us or reach out online to get started. If you would like to learn about our heating services in more detail, read on.

Our Heater Services in Chicago, IL

Technician looking over a gas furnace with a flashlight

Furnace Repair

If your furnace is blowing cold air or making strange noises, Deljo’s team can diagnose and fix the issue quickly. We work with all major furnace brands and carry the tools and parts needed for same-day service.

Furnace Maintenance

Furnace Maintenance

Prevent costly breakdowns and keep your furnace running efficiently with routine maintenance. Our furnace maintenance visits include detailed inspections, cleanings, and performance checks. The result? Optimal performance and energy savings while extending the life of your system.

Repairman fix air conditioning systems

Furnace Installation

When it’s time for a new system, we’ll help you select and install the ideal furnace for your home. Our experts ensure every installation is energy-efficient, reliable, and built to last through Chicago’s harshest winters. Financing options are available to make your upgrade easier.

Man is repairing a heating boiler

Boiler Services

Our technicians are trained in complete boiler service in Chicago and the nearby suburbs. We regularly perform repairs, routine maintenance, and new installations. If your home relies on a boiler for heat, we’ll keep it operating safely and efficiently all season long.

heat-pump-services

Heat Pump Services

Looking for an efficient alternative to traditional heating? Heat pumps provide year-round comfort with both heating and cooling capabilities. Our team installs and maintains top-quality systems designed to perform in Chicago’s unique climate.

Ductless air conditioning unit on bedroom wall

Ductless Systems

For homes without ductwork, ductless mini-split systems offer powerful zoned heating with simple installation and flexible control. Deljo’s experts design and install ductless systems that deliver personalized comfort for every room.

A technician stands close to an air conditioning unit,

Zone Control Systems

Tired of uneven temperatures around your home? Zone control systems allow you to customize heat by room, saving energy and improving comfort.

Repairmen works on a home's air conditioner unit outdoors.

Preventative HVAC Maintenance Program

Members of Deljo’s HVAC maintenance program enjoy annual tune-ups, priority service, and exclusive savings. Enrollment in this plan easily pays for itself and provides you with peace of mind while ensuring all manufacturer warranties are maintained.

Our Heater Services in Chicago, IL

Why Choose Deljo Heating, Cooling & Plumbing for Heating Services?

Since 1922, Deljo has been Chicago’s trusted partner for dependable heating services. We combine old-fashioned integrity with modern expertise. Every customer receives transparent pricing, expert workmanship, and flexible financing options.

Schedule Heating Services Today

Looking for professional heating service in the Chicago area? Whether you need furnace repair, boiler maintenance, or a brand-new heating system installation, Deljo Heating, Cooling & Plumbing is ready to help.

Call us today or contact us online for more information or to schedule service.

Learn More About Your Home's Heating & Cooling

Frequently Asked Questions

How often should heating systems be serviced?

All heating systems should be serviced annually, ideally before the winter season. Regular maintenance helps prevent breakdowns, ensures efficiency, and can extend your system’s life by years.

Common warning signs include:

• Unusual noises
• Uneven heating
• Higher than normal energy bills
• Strange odors
• Frequent cycling on and off
• Failure to reach the set temperature

Furnaces typically last 15-20 years, while boilers can last 20-30 years with proper maintenance. However, older systems become less efficient over time, so replacing a functional system might still be the most cost-effective option.

Boilers use heated water and pipes to warm your home through radiators or in-floor heating. Furnaces heat air and distribute it through ductwork using a blower motor. Boilers generally provide more even heat and better humidity, while furnaces can heat spaces quickly and work with central air conditioning.

Common causes include:

• Thermostat issues
• Pilot light problems
• Electrical issues
• Dirty filters
• Low fuel pressure
• Mechanical failures If your heat stops working, our emergency service is available 24/7.

Regular maintenance is crucial for efficiency. Also consider:

• Upgrading to a high-efficiency system
• Installing a programmable thermostat
• Checking insulation
• Sealing air leaks
• Changing filters regularly

In Chicago’s climate, a high-efficiency system often pays for itself through reduced energy bills. Newer systems can be up to 95% efficient, compared to 60-70% for older models. We can help you calculate potential savings for your specific situation.

You can:

• Change or clean filters monthly
• Keep vents/radiators clear and clean
• Monitor thermostat function
• Listen for unusual noises
• Check for visible issues

However, leave technical maintenance and repairs to professionals to ensure safety and warranty compliance.

Consider replacement if:

• Your system is over 15 years old
• Repairs would cost more than 50% of replacement
• Your energy bills are consistently rising
• You’re experiencing frequent breakdowns

Our technicians can provide an honest assessment based on your system’s age, condition, and repair history.

Schedule Heating Services in Chicago, IL Today

When you need help with heating in Chicago, we're here to help. Call us today at 773-888-4229 for more information or to schedule same-day heater service. Our technicians will identify and address the root cause of your heating issues.

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