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 40
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!
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 |
