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HVAC Preventative Maintenance Plans in Chicago

The Gold Star Program

Regular HVAC maintenance is the best way to ensure a long life for your heating and cooling systems. But with the breakneck pace of modern life, the importance of HVAC maintenance can be easy to overlook. Our HVAC maintenance plan, The Gold Star Program, solves that problem. Signing up makes it easy to keep your HVAC systems in pristine condition while saving money!

The ignore-it-till-it-breaks mindset often leads to expensive repairs at the least convenient times. And while we do provide emergency HVAC service, our Gold Star maintenance program members rarely need them. That’s because we can monitor the wear and tear of your residential or commercial HVAC units over time. This allows us to service moving parts rather than simply replacing them when the system fails.

The Gold Star HVAC preventative maintenance plan offers whole home protection. We inspect your entire HVAC system, optimizing air conditioners, heaters, and even humidifiers. As a result, you’ll enjoy improved efficiency and indoor air quality and need fewer repairs. Plus, you’ll receive priority bookings and discounted service calls should an issue arise.

Our Gold Star Maintenance Agreement includes:

  • Priority Service over non-agreement customers.
  • Reduced-fee service calls during normal business hours Monday through Saturday.
  • Special Saturday appointments at no extra charge
  • System maintenance as low as $24 per month

Heating Equipment

  • Analyze heat exchangers for cracks or deterioration
  • Test safety controls for proper operation
  • Confirm exhaust vent provides necessary air flow
  • Test carbon monoxide emissions and levels
  • Clean burners and pilots
  • Inspect blower motor and wheel
  • Cycle and inspect operating controls
  • Check natural gas lines for leaks and wear
  • Inspect line voltage switch and wiring
  • Check furnace for mold and mildew
  • Measure indoor humidity levels
  • Replace air filters upon request
  • Provide written report of findings and recommendations

Air Conditioning Equipment

  • Clean condenser coils and inspect them for faults
  • Inspect blower motor and wheel
  • Test indoor humidity levels
  • Measure refrigerant level
  • Inspect refrigerant lines for leaks and insulation level
  • Inspect and cycle operating controls
  • Check line voltage and wiring
  • Inspect condensate line for drainage
  • Inspect all electrical connections
  • Replace air filters upon request
  • Provide written report of findings and recommendations

Humidifiers

  • Check for mildew and mineral deposits
  • Inspect condensate systems
  • Confirm water feed line provides adequate flow
  • Test humidifier as a whole for proper operation
  • Measure indoor humidity levels
  • Provide written report of findings and recommendations

From furnaces and heat pumps to humidifiers and ACs, an HVAC preventative maintenance plan can save you money. And the Gold Star program is the most generous HVAC maintenance plan in Chicago, IL.

Heating and air conditioning aren’t just luxuries in Chicago, they’re necessities. Don’t wait until you need emergency services to think about your HVAC system. Give us a call today at 773-829-4295 for more information or to sign up for the Gold Star Program. Your HVAC system and your wallet will thank you.

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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