How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%97+52.9Reliability 24%96+23.3Value 14%100+14.1Replies to reviews 7%100+7.1Experts Score= 97Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.97SCOREZark Heating & Cooling Inc.
Joliet, IL · Grade ALetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20. · #2Position by Experts Score among all companies we track in this category. of 10 boiler installers · 5.0★ from 891 Google reviews
Report card
Percentile vs other boiler installers (100 = best)Each factor is scored 0–100 on absolute terms (star average, share of 1–2★ reviews, price verdicts…); standing within the category can only raise it, never lower it.. Strongest: craft & service and value; weakest: reliability.
Reviews for your job
Customers hired Zark Heating & Cooling Inc. for 8 kinds of job.
Zark Heating & Cooling Inc. for HVAC system maintenance
Clear ✕All 146 Google reviews tagged “HVAC system maintenance” · showing 80
Everything wants smooth. I had been using Wes for years before he joined Zark. I would highly recommend Wes and Zark heating and cooling.
We love Zark! Have been using them for the past 3 years, and never had a bad experience. All the techs are SO nice, and very well knowledgeable. They always explain everything they are doing, & if something needs to be replaced, you get a quote that day. Will forever use Zark!!
Kyle did an excellent job for us! Totally satisfied with the service!
Very happy with the service call
Very professional and reliable service.Always on time or before schedule time.Highly recommended
I had routine annual maintenance on my furnace. Rob was on time, professional and a pleasure to talk to.
Great company.
Pedro was courteous and explained all maintenance procedures/processes that were completed. I felt confident that I was in good hands. I am always confident that Zark is keeping my HVAC running smoothly.
Yes, once again October 2026 Great company, great team too!...that cares about their customers! They take time too explaining it all! YES, always...Very professional and helpful always, every step of the way! Go ZARK! 👍
Very good service keeps you informed and very knowledgeable and a perfectionist Bill.always double checks his work . Even a very minor problem that he sees he takes care of it I only use Zark for my heating and cooling needs
Great first time experience! Great team that came out and was extremely knowledgeable, walked me through every step of owning a boiler (first time boiler owner). Made sure everything was cleaned, worked and check the floor registers as well as throughly explained the boiler process and what to check, do and look out…
Great service and communication!
WEST the hvac tech was super informative,extremely thorough,answered all my questions and left me with peace of mind.
Loyal customer for +10 years !!! I have been using Zark Heating & Cooling since I can remember, and they never disappoint. Today, technicians Zack and Conner came out and they were absolutely fantastic. Both were incredibly professional, knowledgeable, and right on time. They took the time to explain everything…
Zark is always on time, and provide great service. Very happy we have a local business that cares and does great work for a good price
They called to let you know that its time for your Hvac to be serviced. The technician was on time, pleasant to work with and knowledgeable. The price was cheaper than I expected. Everything was put back like we had it and he wore shoe covers in my home.
Honest and professional work! They've done a water heater replacement, AC repair, and furnace maintenance for us. Can't recommend them enough! Same great service on 9/10/26, they were able to get our shop AC up and running quickly! Bill was knowledgeable and through. Excellent job again.
Would always recommend Great company Everyone is polite and on time They do great work for great prices and if there’s any emergency, they’re here I’ve been using them for 15 years
Great company. Cares about their customers. There when you need them. Great customer service. They truly care about their customers
Called after the storm and they were able to come and work on our 2 air-conditioning units. They were able to get 1 back up and running, the other one, needed parts. Very prompt and very reliable.
4/16/26 First time using Zark and very pleased with them and will continue to use for my HVAC needs. First point of contact was making the appointment, yes a live person at that. They were very courteous and informative about the upcoming appointment snd what it entailed. I was provided a 2 hour window which I…
I’ve been with them for three years and they came at a recommendation from a former HVAC company and they have great communication and professionalism.
ZARK HEATING & COOLING are truly the best for all of your heating and cooling needs! From the receptionist to the maintenance/repair service personnel all execute GREAT customer service and knowledge of the HVAC systems! I feel confident knowing that ZARK will be truthful and honest with me and that is what is…
Kristy, Rob and Bill @Zark were awesome, Had an AC issue and within 90 mins Bill was at my home, and took care of the issue, at 7PM. Amazing service, thanks to Zark, and a special call out to Bill, great job as always.
Serviceman Bill was prompt and courteous. He was excellent at determining the problem and fixed it. He explains everything to do with the thermostat as well until I felt confident with being able to work it myself I recommend this company. they are reliable and reasonable.
Zark is great! They have been servicing my HVAC for 5 years now and I have never had an issue. They are on time, professional, and have good prices. Their service workers do not try to upsell you unnecessary work. Highly recommend using them
Bill worked hard to find the problem and he fixed it. He was very good and professional.
Professional, friendly service. The technicians are very knowledgeable.
Always great prompt service! Wes knows his stuff!
Zark is excellent!
They are very professional. Quality work and equipment. They clean up nicely when done. I will recommend them to everyone.
Rob, Dan, Keith and their entire team were outstanding and a joy to work with. Their professionalism, punctuality and knowledge made the whole normally stressful experience easy. Highly recommended.
The Techs arrived on time, and was very thorough in servicing my A/C unit. All work was done at a fair price, and I will be using Zark Heating & Cooling again when the need arises.
The appointment process was straightforward. Rob, the technician, arrived on time and even texted a heads up for being 10 minutes out. The maintenance process took less than an hour and he even stopped to answer questions I had. Very professional service, no issues!
These guys are the greatest! They arrive on time, are polite and always answer any questions that I have. Even tho it was only maintenance this time, they still took the time to tell me what was done and everything was good. Highly recommend them!
The technician was outstanding and very professional
Never had any complaints about service in all the years using Zark. Highly recommend!
Excellent service- quick to come out and extremely considerate service man!
Zach and Connor did their usual excellent job while performing my annual AC checkup. Professional, courteous and expert service. Highly recommend Zark for any of your HVAC needs.
Great service very informative!
This company is a great family owned business...been using them a few years. No complaints ever!!
Fast repairs and reasonable
Very good company to do business with. My tech Bill is very knowledgeable. Stickler for details. Always let's you know what's going on and why. Plus he comes off as just a good guy.
We are very satisfied with the completeness and thorough attention to providing details regarding the conditiom of our furnace and the recommendations of what action we should take to service or replace or aging unit
Rob is great, quick, and efficient! We have been using this company since we moved in 3 years ago and they are always easy to work with!
Very knowledgeable and professional.
Wes has been taking care of our HVAC systems for several years now and we couldn’t be happier. He’s very knowledgeable and professional. We don’t hesitate to contact him whenever we need his help!
they are always professional and explain any problems so tath you can understand it
I just wanna share this a wonderful experience the gentleman who came to my home to perform this service was above and beyond, very kind and courteous and respectful! I would recommend these guys along with this company to anyone who’s looking for a phenomenal service! Thank you, Zark. You guys are awesome!!! The…
So I call this morning for a service call no AI machine Nichole answered on the first ring. It was about 10:30 am I had already tried to start my furnace. I figure I'd have a long wait but I got a text from Bill Jacob with in the half hour he got to business and in no time I had heat so glad you are in the neighborhood. Thank you
Zark is the best for heating and cooling. Bill came out today to clean my furnace. He was very thorough and explained everything along the way. Very knowledgeable and professional. I will only go to Zark! I wish I could give more than 5 stars!
I had an older furnace that went out and needed some maintence to get it back to working condition. Called the number and was able to get someone to come out the next day. Bill came out and diagnosed and fixed the issue all in one day. He was very nice and patient and explained everything and also gave us some…
Fast service, friendly and informative. Will continue to recommend.
5 Star Every Experience! This time was for a cleaning and check-up of furnace. Also have had an installation of A/C nearly 2 yrs ago,providing the best pricing after shopping around, and anytime I've called customer service or reaching out for yearly maintenance. Technician was prompt, and very helpful with…
The best and most trustworthy!
Zark is the best for heating and cooling. Got my furnace cleaned.
1/7/26 Update: still a fantastic company to work with! I always recommend Zark Zark has become our Go-To for all HVAC needs. Our very first experience with them, came when our AC went out, during the hottest weekend of the year. They were prompt to come out and significantly competitive to other, well…
Big thanks to Zark heating & Cooling! Replaced the A Coil and got our A/C up and running! So appreciate the fast and professional service! Your maintenance program is the best, always on top of problems!! Highly recommend Zark Heating and Cooling Inc...They are there when you need them!
Zark is the company you want to use for your HVAC needs. Professional and experienced service, plus honest, courteous and knowledgeable. Zach explained from start to finish what he was doing and what the cost would be (which was very fair and reasonable ). A+++ rating from us.
Zark is the only HVAC company I use. The service and friendly personnel keep me as a satisfied customer. Having their annual maintenance contract gives me peace of mind.
Just had the annual service before the long winter...updated the humidifier. Great job.
Zark is the best In the New Lenox area!
Always a great day when Zark shows up to inspect the furnace before the frigid temperatures! Great job as always! 5 Star ⭐️ company!
We woke up this morning - February 6th - and we had no heat. I called several HVAC companies but all were on vm. I looked on the internet and found ZARK. I called and got Christy on the line. She said she could have a serviceman out within the hour and quoted a price of $129.00 because it was Saturday but said…
Great experience! Zach was awesome to work with and was great at explaining everything he had done. Highly recommend!!
Dependable service, polite serviceman.
We've been using Zark Heating & Cooling for our primary residence and rental property for multiple years. They provide professional, quality, and timely service at affordable prices. I'd highly recommend signing up for their maintenance plan which will keep your HVAC equipment running smoothly! (A few times…
Highly recommend for yearly heating and cooling clean and check!
We have been using Zark for the last couple years. They are the best.
I absolutely love Zark Heating and Air. I've been a customer for a very long time and Rob has always been great! Today, we had Zach as our service guy, and he was very polite, prompt and knowledgeable. I would highly recommend Zark Heating and Air to everyone with complete confidence 👌 They even offer a membership, which is a huge savings!
Zack was very polite & explained everything very well. Zark Heating & Cooling is very professional & reasonable pricing. Highly recommend.
Called to schedule my fall maintenance. Zach arrived on time. Maintenance was done and he also checked the whole house humidifier which Zark installed. Highly recommend Zark heating and cooling.
Zark Heating and Cooling is top-notch in communication, scheduling, empathy, and service. After being with my previous heating and cooling company for 20 years, my account was transitioned to Zark upon their retirement. When my air conditioner broke down during the hottest days, Zark responded quickly and resolved…
Always happy with the service. The cover to the air filter was off, not connected, and leaning against the unit.
Great company with positive workers. Very helpful and knowledgeable. Would recommend to anyone for HVAC needs.
I have used Zark heating for several years. Bill is fantastic! Extremely efficient, professional and explains everything! Highly recommend their services.
Jackson and Bill did a great job with our furnace. I recommend Zark for your furnace needs....
Timely, considerate and experienced. Fairly priced as well.
I just had an inspection done on an A/C unit I purchased last year. The inspection was free and offered as part of my warranty. The technician they sent out (Jackson) was incredibly helpful, polite and knowledgeable. He arrived right on time and was quick and efficient. Why can’t all companies have techs like this?…
Zach was friendly and efficient with our tune up and replacing the capacitor.
Price
Bar = middle half of what customers paid · gold mark = category median.
Price verdictsGoogle asks reviewers whether the price was great, reasonable or overpriced; these are their answers.
Jobs customers hired them for
| Job | Reviews | Category typical |
|---|---|---|
| HVAC system maintenance | 144 | $37–$264 |
| HVAC system repair | 93 | $145–$618 |
| Heating system installation | 75 | $1.4k–$2.8k |
| Install AC | 73 | $1.6k–$3.2k |
| Heating system maintenance | 67 | $37–$317 |
| A/C system maintenance | 66 | $39–$318 |
| Heating system repair | 63 | $78–$745 |
| A/C system repair | 45 | $216–$611 |
