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 repair
Clear ✕All 94 Google reviews tagged “HVAC system repair” · showing 80
Dread...let's talk a moment about DREAD! Like when you have no heat or car won't start or the fridge fails...here comes the DREAD!!! Today dread was present...as in no heat! However DREAD faded away when Bill said those magic words...'Covered under warranty'. Thank you Bill and Zark for being totally honest! A rare commodity!!!
My daughter needed a new A/C unit in Manhattan....she mentioned Zark...you guys gave her a good deal...and were honest....Bill and Kyle from Zark showed up to my house for repairs on my A/C unit....both professional....honest....Bills knowledge blew me away.....let me know prices and options.....very happy.....would recommend 👌
Service was awesome…as always. Bill was AWESOME! Best Tech ever!!!! Highly recommended. Zark has been our go to guy forever and a day. Never disappoints.
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
Professional, knowledgeable and personable service provided by the technician.
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.
Very hot day today. Central air unit had shut down. Called this morning, and they had it going by mid afternoon. Zark always comes to the rescue for our farmhouse.
Zark saved the day! 90+ degrees with a pregnant wife at home is not the time for the AC to go out, but Zark was amazing! Bill was very helpful not only in communicating his eta but also his explanations of issues. No pressure to upsell services. Quick diagnosis, quick fix. I’m a customer forever now. Thank you Bill and thank you Zark!
Zark is the best ! very honest people to work with always here same day I call . Very polite and I wouldn’t call anyone else . Excellent company!
Reliable company and nice technicians
Always the best service! Knowledgeable, professional service. Have used them at our old home and now our new location. Easy to make appointments and their Service techs, especially Bill, explain everything. I would highly recommend using Zark for all your heating and cooling needs.
A/C stopped working during the night. Got an early appointment slot and Rob showed up after the terrible storms. Got our unit back up and running fast. Rob couldn’t have been nocer. Highly recommend!
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.
terrible customer service
Excellent service. Prompt, effective, knowledgeable, fair, friendly. Much appreciated.
I cannot say enough good things about Zark Heating & Cooling. Rob, the owner, personally met us at our business and was involved every step of the way. From the beginning, he and his entire crew were extremely responsive, punctual, and professional. Our business was in a very difficult situation, and Zark came in,…
Rob was very helpful and was so efficient and quick in diagnosing the issue and the service time was quick and couldn’t be happier
Came out quickly to fix my air on this extremely hot day! Great company! Get on their maintenance plan…it has perks!
Record heat and Wes with ZArk was out and fixed our AC. We wouldn’t use anyone else. Fast dependable honest experts
Very happy that they were able to get to us quickly and resolve the issue with our air conditioning. The technician was very helpful.
In this terrible heat we’ve been having, Rob came by to fix my problem very early! Before his first appointment! That’s above and beyond! Thank you Zark Heating and Cooling.
First time I’ve needed any repair work done for any heating/cooling issues. Zark answered my call before 7 am and had me scheduled for repairs a few hours later on my AC. Wes was quick and thorough with his repairs and did an awesome job. Thank you!
Expedited service, knowledgeable technician, quick repair. Thank you.
Our blower motor went out on a 100 degree day. Zark came out and gave us options, didn't push for the most expensive, and explained everything in detail. They were able to get equipment and got to my house at 6:30am because they knew we were HOT. I would never go with anyone else!
Zark did great work! Their prices were very fair and they were extremely professional. Their employees were extremely knowledgeable and helped explain the entire process. The guys who came to install the furnis and duct work cleaned up after their mess and wore shoe covers which shows their attention to detail.…
Bill came out 7am the next day after a small fire disabled my AC unit. I had 4 seasons out the day of the incident and they just wanted to replace it for a measly 8k but Bill took the time to pull the case apart and test the unit thoroughly discovering the issue was simply a damaged wire. Quick replacement and top…
Great service very informative!
Used them a few times, good experience each time. Employees on time pleasant and honest. Would definitely recommend them
Zark is a great company to deal with. Great customer service from Kristy and great service from Bill. Highly recommended
5 ⭐️ service from beginning to end. We had 4 different quotes for an AC/Furnace and water heater replacement and Zark provided the best price along with warranty and professionalism that makes a stressful situation feel so much better. We worked with Bill, Rob and Zach and they made sure my wife and I felt…
Knowledgeable, efficient, reasonable, and explain things in a way I can understand. Good people to do business with. Thank you.
Great company and great people always doing the best work! Wouldn’t call for any other company to come and do what ZARK can do. They are absolutely the best!
I've used Zarks in the past. Same good service!!!!!
Furnace went out yesterday and Zark has it fixed today! Zach was terrific to work with! Highly recommend Zark for any of your hvac needs!
Rob & Zach were great! Excellent service. Professional, courteous & prompt response. Sign up for their service contract. Great company!!
Zark was great! Fast emergency service and honest assessment. Always my goto for hvac needs!
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…
Came out fast on a real cold day, found problem and a fix is on the way. Fair price.
Zark came out really quickly in the freezing cold today! I am so thankful we now have heat when it is well below zero outside. They were polite and efficient!
Very courteous, professional, and thorough.
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…
Rob and his partner were here within 45 minutes to fix our furnace when it went out! Problem was fixed and furnace was working within two hours of calling. Great service! Thanks
We called Zark because our furnace was blowing cold air. Zach cleaned the furnace and advised some possible parts to replace if the cleaning doesn’t help. He also provided estimates for a new unit. We signed up for the annual plan and hope we don’t need to see them until the spring!
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!
Rob arrived early, which worked out perfectly for me. He was thorough in the diagnostics and finding the part that was malfunctioning. He was here about 1.5 hrs from start to finish. Price was reasonable and I'm 1 happy customer to have consistent heat again. Thanks, Zark!
These people are great. Furnace wasn’t working the day after Christmas and the owner showed up 30 minutes later and fixed the furnace promptly. Couldn’t believe it right after a holiday.
Very quick call back and repair visit. Thanks so much!
I called this morning with furnace issues and Rob was here a couple hours later and had it fixed in no time. Top notch company and technician! I will definitely recommend to anyone needing any hvac service!
I had an emergency it was freezing out and my heat went out and they came out so quick and was so polite. Was able to make the fix by having the part available. Definitely will be using again
Great experience, technician Bill explained everything very well. Great for the 1st visit I will definitely recommend Zark heating and cooling. Rob installed my combo heat and a/c Units very happy with my new installation.
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…
We have been using Zark for the last couple years. They are the best.
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.
I highly recommend Zark! Zach came out the same day, thoroughly went through my options, fixed our air conditioner, and set up a maintenance plan for the future. Affordable service, quick, and a local family. Zark will be our go to in the future, and a company that we will recommend to friends and family!
Excellent service, called at noon, at my house by 3, everything working by 4. Thank you, Zark, you took the stress out of the situation.
Zark did an amazing job replacing our air conditioner. Zach and Rob did a quick install, cleaned up and went over everything they did. Highly recommended!!
This is such a great company tech was very nice and on time. He explained everything to use and answered any questions we had. Did not try to sell anything extra. I would highly recommend them!
Our AC compressor went bad, Zark did the install so I had them come out. They were out the same day. They ordered the part under warranty and came back as soon as the part was in stock. Always professional and friendly. Thanks Zark!
Jackson was great, very professional, very friendly, extremely efficient! I highly recommend getting on their maintenance program. Great price and great service!!
Thank you Zark! I called for a second opinion and we’re so grateful that you were able to not only diagnose but solve our somewhat hidden problem despite having a different company out 3 times. The guys were fantastic and explained everything. Amazing service!
Our AC wasn't working on a 90 degree day. I called Zark and they came out the same day. They quickly solved the problem and now my house is cool. Zark is great to work with.
Zach was friendly and efficient with our tune up and replacing the capacitor.
Quick, fast, professional service
Rob came out the same day, was very friendly and professional. He explained exactly what was wrong and was able to fix it quickly. Rally glad we found them!
Rob from Zark is great! Fixed our AC on a Sunday in 100 degree weather. Responsive, trustworthy, and professional. We also bought our furnace and water heater from Zark. Highly recommend!
My air broke down and the came the next morning and were able to fix it. I will definitely call the again when needed. Thank you.
Awesome company to do business with. The team at Zark treats you like family and always looks out for your best interest. Recently had a new AC installed and their team did a fantastic job.
I was introduced to the owner through a client and have been using and recommending Zark Heating & Cooling for years. They've always been very responsive and honest. I never feel like I'm being upsold.
My heat went out last night, and I texted Zark and received an immediate response back. I was able to quickly schedule a service time for today. Bill notified me prior to arrival that he was on his way. He took his time to explain the different parts of the furnace and what the issues were. He was able to…
Very professional, very courteous. Great service. Will definitely recommed
Great and easy to work with, would use them again for sure!
Zark is the best! Our air went out on a Saturday anfter and Zark was there to fix the issue super fast! They’re awesome! Friendly, professional and reliable!! We won’t be using any one else!
ZARK is an amazing company that I’ve had come out more than once. I’ll always use ZARK!! Such a great team the company has. Thank you for all that you guys do!
Pedro is my hero! They came out same day I called to get our AC back up and running. He was super nice and professional. I've always been told Zark is great so they were my first call. 5 Stars
I have had a maintenance agreement with ZARK since 2008 when Rob was just starting out on his own. It has been a pleasure to see this company grow and flourish into the outstanding and reliable company they are today. Our A/C quit working around 9pm on 7/27/23 so I sent a text and chatted with Rob. He was out the…
Excellent service and pricing. Will be my first call for all HVAC needs in the future.
I use ZARK for maintenance on my heating and cooling unit. I have had 2 separate instances where my furnace wasn’t working and it was cold out. I called and spoke to Kristy who had a repair tech come out that day to fix my heat. I was so thankful that someone could come out so fast and fix my unit. I would also like…
We've been using Zark for a few years now and we are so glad we switched. Professional employees who treat you with respect.
Zark is great to do business with. We use them all the time. Even walked me through a quick fix when I had an issue.
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 |
