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Comprehensive Services for HVAC in Mount Prospect, IL

Any time your heating or cooling system stops working or shows signs of trouble, don’t delay reaching out for help. What may begin as a small, relatively inexpensive fix can easily become a big problem that costs more to solve. You want reliable, trustworthy service from a company that acts with integrity and transparency, and has the experience to do things right the first time.

Deljo Heating and Cooling has been around for over a century, building lifelong relationships with customers based on top-notch HVAC service. We use only high-quality products and we guarantee 100% customer satisfaction with every job.


HVAC Maintenance and Service

Routine maintenance on your air conditioner, furnace, or heat pump will prolong the life and improve the efficiency of your home’s HVAC system. We recommend biannual maintenance before summer and winter to ensure things run smoothly during extreme weather conditions. During our maintenance visits, we clean, test, and replace parts as needed. Before we leave we test the system to ensure peak performance and efficiency.

If you experience a problem between maintenance visits or notice odd smells or sounds coming from your heater or AC unit, rely on us for prompt, professional system diagnosis and repair. We are licensed and trained to work on all types of HVAC equipment and we will always be honest with you about your options. If repair is not possible, or if a replacement would be more economical, we will let you know and discuss options with you.

Mount Prospect Heating and Cooling Installation

Any time your furnace or air conditioning system needs to be replaced or updated, you can count on Deljo Heating and Cooling for the best HVAC service. We will gladly replace your current system or we can discuss options with you for upgrading if you prefer.

If you are unsure about the HVAC system best for your home and your family’s needs, let us know. We have the experience to make professional recommendations you and your budget will be happy with.

If you need additional heating and air conditioning installed in your home, we can help. From adding ductwork to installing ductless heating and cooling systems, we will ensure your home is comfortable and the new system is running perfectly.

100 Years of Trusted HVAC Experience

Deljo Heating and Cooling started out by building customer relationships based on honesty and high standards. Today our company is still based on those values. We treat each customer as a valued member of our community and promise to provide the best HVAC service possible.

To learn more about our HVAC services or our company, please reach out online or call Dejo Heating and Cooling today.

Client Testimonials

Read the opinions of our satisfied customers.

I always use Deljo. The entire staff is amazing from intake calls to install. They were fast, professional and gave us a fair price.

Monica OConnor Chicago IL.

Joe was great. We came home to a cold house on a Sunday night and he came out to diagnose the issue right away. Very knowledgeable, very friendly.

Kyle Sant Chicago IL.

We’ve been using Deljo for several years and have had a great experience with them. They’re prompt, reliable, and trustworthy. The technicians (David was the most recent) have been great.

Ari Telisman Chicago IL.

My hot water heater had some leaky pipes due to corroded unions. The repair took longer than I thought due to some unforeseen circumstances. Unfortunately after the repairs the water heater stopped working...

Maria Pradd Chicago IL.

Questions? We Can Help! Contact Us Today!

Our Service Areas

Contact Deljo Heating & Cooling today. We look forward to hearing from you and helping out with all your indoor comfort needs.

Chicago Suburbs

Chicago Neighborhoods