Heating or plumbing emergency? We’ve got you covered!

Guarantees

SATISFACTION GUARANTEE

As your HVAC and plumbing partner and a member of your community, our priority is your complete 100% satisfaction with the equipment provided by us and paid for by you. If you are dissatisfied with the operation of the equipment we have installed within the first year, we will do everything in our power to correct the problem.

After we have corrected the problem and the equipment is still not operating to manufacturer standards, and the manufacturer’s representative has verified its failure and no other alternative is available, we will remove the system and refund your money in full upon your written request.

INSTALLATION WORKMANSHIP GUARANTEE

We have the utmost faith in the skill, attitude, professionalism, and workmanship of our installation crews because they have been picked, trained, and instructed after undergoing criminal background checks and drug testing. They will care for your home and complete the job with speed and precision.

They wear booties (floor savers), clean up when they are finished, and take personal responsibility for your satisfaction. They will not smoke or swear in your home, and will always be polite and courteous.

When they have finished in your home, if they have not performed according to these high standards, we’ll issue you at no charge a two-year Club Membership valued at $328.00. All we ask is that you notify the office of your dissatisfaction prior to your installation crew leaving your home.

BETTER THAN WE FOUND IT GUARANTEE

We realize that many homeowners fear contractors entering their homes only to create a mess and damage their property. Because of the quality of our installation teams, we can guarantee that we will leave your home BETTER than we found it or we will pay for a cleaning service to come to your home and clean it in its entirety. We are that confident.

24-HOUR SERVICE GUARANTEE

We are committed to being a top-quality service organization and promise to have a fully trained qualified service technician available to service your furnace and air conditioner 365 days a year, day, and night. We never shut down or are unavailable.

With this dedication comes a staff of technicians that rotate on a night call shift. What that means to you is we are available for you when you might need us the most. Whether it is Christmas, Sunday, or the middle of the night, we are here for you.

TEMPERATURE SELECTION GUARANTEE

Your comfort is our top priority, which is why we include a guarantee that when the equipment we have installed is maintained and operated according to the manufacturer’s operating and maintenance manuals, the system will perform as we have stated and agreed upon.

We promise a temperature variance of no more than plus or minus two degrees at your electronic thermostat when heating or cooling your home. If the desired temperature selection is not achieved, we will make any upgrades, modifications, or repairs necessary to reach the desired temperature at no charge to you for 2 years if you maintain your Gold Star Membership.

EXCLUSIVE “NO LEMON” GUARANTEE

We understand the frustration of heating and air conditioning equipment that fails repeatedly and that not every manufactured piece of equipment is 100% perfect. Since you have a right to expect to receive 100% of the heating and cooling value you invested in, we offer a “No Lemon” guarantee on our systems.

Simply stated, as long as you have an active Gold Star Membership, if the compressor in your air conditioner fails twice in the first 5 years, we will replace the entire outside unit with a brand-new current model. If the heat exchanger in your furnace fails within the first 10 years, we will replace the furnace with a brand-new furnace of the current model. If you have ever bought a “Lemon” before, you will truly appreciate our commitment to your long-term satisfaction.

24-HOUR FIX IT OR HOTEL, DINNER, AND A MOVIE GUARANTEE

We are so confident in our staff of qualified service technicians that in the unlikely event of a system failure, if we can’t have your system up and running within 24 hours of arrival, we will put you up in a local hotel for the night, give you $50 to buy dinner and $30 for a movie – we’ll even throw in $15 for popcorn!

***The hotel stay is covered up to a maximum value of $200 per night. Any additional cost is the customer’s responsibility.

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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