K&J Heating and Cooling is the western suburbs’ most trusted HVAC partner. When a Chicago summer hits, you need an AC system you can count on. K&J Heating and Cooling delivers expert air conditioning repair, maintenance, and installation throughout DuPage County so your home stays comfortable no matter what the forecast says.
Stay Cool.
All Summer Long.
Welcome to K & J
Clean Air, Trusted Care
Complete Air Conditioning Services
AC Repair
We work on all makes, models, and ages of cooling systems, from small calibration issues to complete system failure. Our friendly technicians diagnose the problem fast and fix it right the first time.
Your neighbors in comfort.
We’re an old-school, local business that understands that too many homeowners get the runaround from large companies that don’t really care. Here’s what makes us different: we show up on time, we explain things in plain language (not confusing technical jargon), and we never push services you don’t actually need. None of our technicians are commissioned, so no pushy salespeople in your home!
We’re not just another HVAC company – we’re your neighbors here in DuPage County.
Our team has decades of combined experience, but we never stop learning. We may be old school, but we know HVAC technology continues to evolve, and we evolve with it so we can offer you the best, most efficient solutions available. When you work with K&J, you’re working with people who genuinely care about keeping your home comfortable.
Meet K&J Heating & Cooling
Quality work. Honest people. Total comfort.
Here’s Why You Should Choose Us
Honest, Upfront Pricing
Same-Day Service Available
Warranty Compliance
Carrier Factory Authorized Dealer
100% Satisfaction Guarantee
What Your Neighbors Are Saying About Us
We care about our reputation the same way we do the quality of work we provide.
K&J did a great job replacing our AC & Furnace. The crew was on time, efficient, and knowledgeable. After meeting with Ilan, we felt confident we weren’t being oversold on equipment. He made recommendations based on the size of our home and energy efficiency concerns, presenting multiple options we could choose from. We had our new system fully installed within a week of our initial consultation. Great service!
Tony R.
We have relied on K&J Cooling for several years now. They don’t just do routine maintenance but have helped us fix serious issues with our HVAC system so we’ve come to expect a lot from their Technicians. Sam more than delivered. He was knowledgeable, experienced and very conscious of our time and budget. On top of that, he cleaned up his work areas beautifully. We will definitely be requesting him again come Spring.
Patricia P.
Have had K & J to keep my heating and AC up to date and cleaned for 10 years, they have been trustworthy and honest and keeping my equipment working so no surprises very friendly, easy to talk to and helps me to understand how to keep things going. I would recommend them for sure.
Jane J.
A new AC system shouldn’t break the bank.
Flexible Financing Options Available
A failing AC system is never convenient, and the last thing you need is sticker shock on top of a hot house. K&J Heating and Cooling offers flexible financing options on qualifying air conditioning equipment and installations, so you can get a reliable, efficient system now and pay over time with manageable monthly payments.
© 2026 K&J Heating & Cooling. All rights reserved.
Our Services Areas
Serving Chicago's Western Suburbs
Wheaton
Glen Ellyn
Downers Grove
Oak Brook
Naperville
Lombard
Carol Stream
Lisle
Woodridge
Elmhurst
Villa Park
Addison
Your Comfort is One Call Away
Don’t Sweat It - Call K&J Heating and Cooling Today
Whether your system needs a quick fix, a seasonal tune-up, or a full replacement, K&J Heating and Cooling is ready to respond. Fast service, honest pricing, and the expertise to do the job right, every time.
4.9 RATING
Wheaton
Glen Ellyn
Downers Grove
Oak Brook
Naperville
Lombard
Carol Stream
Lisle
Woodridge
Darien
Villa Park
Addison
Comfort you can feel.
Services you can trust.
AC Maintenance
Routine maintenance is the single best thing you can do for your cooling system. Our licensed team will clean, tighten, and troubleshoot your AC to maximize efficiency and extend its lifespan up to 20 years.
AC Installation
Upgrade to a newer Trane system and immediately start saving on energy bills. Our certified install technicians handle every aspect of the job, cleanly, correctly, and in full compliance with warranty requirements.
System Diagnostics
Not sure what’s wrong? Our comprehensive diagnostic service identifies the root cause of your cooling problems so you get an honest recommendation, not a guesswork repair that costs you twice.
From quick repairs to full system replacement, our certified AC technicians are equipped to handle any cooling challenge.
Our Special Offers
Because comfort should always feel within reach
Up to $2,100 Carrier Rebate
When you purchase qualifying heating or cooling products + 0% APR Financing for 60 Months
Limited Time Offer. Call for details.
Free Whole Home Air Purifier or Humidifier
with any Infinity system purchase
Limited Time Offer. Call for details.
Factory Authorized Dealers are masters of heating and air conditioning craft.
We Are Carrier Factory Authorized Dealers
Our HVAC technicians are specially trained to inspect, diagnose, and provide the most effective and efficient heating and air conditioning solutions for your home. Our priority is to ensure optimal performance and comfort. K&J Heating and Cooling is committed to excellence.
