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HVAC FAQs

We all rely on heating, ventilation, and air conditioning (HVAC) every day to keep us comfortable. But over the years, HVAC systems have gotten much more complicated. To help answer your most frequently asked questions, Deljo Heating, Cooling & Plumbing, a Carrier dealer in Irving Park, has assembled this list of HVAC FAQs.

When Do I Need to Hire an HVAC Professional?

If you’re not sure, you may as well err on the side of at least calling an HVAC professional to diagnose your problem. You’ll definitely want to call an HVAC pro if you’re replacing, repairing, or inspecting a water heater, air conditioner, or furnace.

Not only will an HVAC professional ensure that all your HVAC issues are handled safely, but he or she will also make sure your HVAC system is running efficiently.

What’s the Difference Between Electric and Gas Water Heaters?

From a functional point of view, electric and gas water heaters are quite similar. The only real difference is the mechanism by which the water is heated. However, where a gas water heater may be as tall as your ceiling and three to four feet wide, an electric water heater can be mounted on your wall. Most of them are about the size of a small suitcase.

How Often Should I Inspect My HVAC System?

Your HVAC system actually consists of many parts, from the ducts to the furnace to the water heater. Each of these components, and more, make up a complete HVAC system. To be safe, you should inspect your HVAC system at least once a year. It’s always a good idea to check on it before winter so you’re not left freezing while you wait for a professional to help you.

When Should I Install a New Furnace?

Furnaces usually last 18 to 20 years if you have it regularly maintained. But if you don’t know how old your furnace is, it can be tough to decide whether it’s time to replace it or not. Generally, if your furnace is constantly breaking down and requiring costly repairs, it’s time to replace it. As a general rule of thumb from Deljo Heating, Cooling & Plumbing, a Carrier dealer in Irving Park, you should replace a furnace if the cost of a repair exceeds or equals 50 percent of how much a new replacement furnace would cost.

Where Can I Find a Carrier Dealer in Irving Park?

You already did! Deljo Heating, Cooling & Plumbing is proud to be a Carrier dealer in Irving Park. Give us a call 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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