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 heating system repair
Clear ✕All 63 Google reviews tagged “Heating system repair”
We've always had a great experience with Zark. Any tech that has come out has been knowledgeable and friendly. Would highly recommend
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,…
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…
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.
Called Zark at 7am and they made sure to be to my house by 9am!! Our heat went out and they were so easy to work with and so quick and experienced! Love using Zark for all our heating and air!!!
We called this morning, and have heat this afternoon. Thank you
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…
Zach was thorough and took the time to walk me through what needed to be replaced, which I really appreciated!
Woke up to furnace not working. Sent a text around 6AM and Zark answered within 5 minutes. Zach was at my house 30 minutes later. Furnace back up and running in 10 min. They are honest and do not upsell you on items or services you don’t need. That’s Zark for ya. Hands down the best!!! #handsdownthebestZARK. 😀
I called Zark at 3:47pm when I was at work and noticed my heat inside my home had dropped to 58 degrees and wasn’t increasing. It was -1 degrees outside. The woman who answered was friendly and professional and said she could get someone out there in about 10 min. Zack pulled in as I got home, looked at the furnace…
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.
Heat went out and a tech came out within hours and was able to diagnose and replace parts that same day. Great service
Honest, fair and fast. Can’t ask for much more. My go-to HVAC company for business and residential.
Zark is reliable, efficient, honest and trustworthy and friendly. We have always received top notch service from them. Recommend them 100%.
As always, Zark guys are great. Today Zach came as scheduled, was professional and accomplished the job efficiently in a short amount of time. Highly recommend Zark Heating and Cooling.
Just had my fall furnace tune up. Alex did a terrific job. He was friendly, polite and very efficient. Being on Zark's maintenance plan really saves money too! 2 more years of great service as of April 2024. They're the best around
Top notch service and communication. Highly recommend.
Zark Is my family’s Number one company that we turn to for our heating and cooling needs. No matter what they have always been there for us, even if it’s just a response to resolve a quick problem through Facebook messenger! We have used them in the past and will definitely be using them again in the future whenever an issue arises with our aging systems.
My technician Rob was awesome. He was professional, courteous, and explained everything while troubleshooting the heating system. Plus fixed it so I'll have peace of mind this winter.
They responded quickly and a technician was out that day. Fair prices and great service
After reading all of the other good reviews here and on Facebook, I decided to call them when my heat would not stay on. It was a fast, easy phone call (I hate making phone calls), they were on time and diagnosed my problem and reset my furnace and we were good to go. I will definitely call them for a quote on a new system.
Replace a furnace in our building
I've been using Zark for over 15 years and recommend the company all the time. There is no one better.
The service guy came to fix my heat and he thoroughly explained all my options to make sure I could decide what’s best for me. I couldn’t have asked for a more professional experience. I really appreciate driving all the way to Manteno in less than two hours after I called! Thank you so much!
Came up clutch when we needed repairs done to our furnace. Would definitely recommend
We first used Zark in Gardner for a furnace tune-up and vent repair. It's an old house and had some special challenges, but they handled it all like a champ. Then we signed up for the annual maintenance plan to have regular checkups for the furnace and A/C. Each technician who came out to the house was…
Zark Heating and Cooling has maintained my furnace and AC for a number of years and have been able to update my water heater when it started to leak. By handling my furnace maintenance they were able to foresee when I was in need of a new furnace and humidifier. I recommend them to my family and friends. Their associates are friendly and knowledgeable.
Great customer service.quick response to emergency situation Dan Leja came to our home fixed the problem with in an hour. Explained the issue Dan had a great attitude very professional. I would highly recommend this company to anyone. So happy they were able to come as quickly as they did since the weather was below…
I texted Rob at 1:30 this morning in tears, not only did he text me back at 5:30am he was patient with me while I rambled off what I thought was wrong with our furnace. I have three young children so I was obviously quite upset. Rob told me he would be out as soon as possible. After Rob arrived at our house he…
Dan was pleasant and told us everything he was doing. He arrived very quickly which was very important to us.
Our Heat went out in the middle of the night Rob contacted us a very short time after we texted. Rob came right out and made the repairs. He was so nice and professional. Highly recommend and we will definitely be using them for all our maintenance needs.
Used Zark for repairs on my electric furnace 2 different times and have been very satisfied with their response time and service. Dan was the technician on my last repair which required him to go into the crawl space to repair some duct work. He was not afraid to get dirty! Thanks Dan.
Zark is an all around great business that provides excellent customer service. They are very responsive and professional in everything they do. I had them come repair my furnace along with replace my water heater. I want to specifically call out Dan L and his team that installed my water heater. He was very…
We had water leaking from air conditioning condenser and needed a long overdue tuneup of our furnace. Zark was quick to reply to us and came out the next day. They were prompt and fixed our issue. We found them very knowledgeable.
Super fast response in freezing weather for heat down. Not only fixed the problem, but made adjustments to the installation (done by others) that made the heat work better than when it was new! Great experience!
Zark is fantastic! We are always very satisfied with our service from them. Dan was out yesterday to check on an issue with our furnace and we were so happy with the work he provided. We ended up needing a new furnace, and they were able to get us in the next day. Everything today with the install went great and was…
Technician Dan and his apprentice came all the way out to my house in Schererville, IN to address my furnace that was not working. While another company wanted to charge me almost 14k to replace the unit, Dan identified the issue was a burned out board and was able to replace it in a very timely manner and provide…
Highly recommended! I came home Friday to a very cold house and with the temperatures dropping, I was hoping to find a company that could come out by the next day . I am so glad I called Zark Heating and Cooling because I didn’t have to wait and they were able to come out within the hour . I really appreciated it…
Great people to do business with. One of our heating units failed and Zark was out the next day replacing it with a high efficiency system. Their workmen were courteous and prompt, their work was exemplary and they left our house clean after they had finished. Could not be happier with the value of their work. Honest and reliable!
Called Zark this week for service on my furnace. Rob showed up on time, very friendly and with a few adjustments the furnace was up and running. He explained everything he was adjusting, very knowledgeable and great customer service. Zark Heating & Cooling is the only company I would use, highly recommend them.
We have used ZARK every time we have had any HVAC needs. We have also referred them to family and friends. They have never disappointed. They go above and beyond for their customers especially when there is an HVAC problem during severe weather. They are a family owned business who are trustworthy and fair. All around great people who do great work!
They were very responsive and answered our call on a Sunday evening!
Couldn't get the furnace to work. They came out promptly ang got my furnace going. Also got a great price on replacing my water heater. Should have it installed tomorrow. Looks like I found my go to company.
Been using Zarks for a few years for my heat and AC. All techs are professional, trustworthy, patient, clean and on time. No job is too small or too big.
Excellent and quick service to fix my broken furnace. Keith was absolutely awesome from start to finish and will continue to use for any heating and air service issue I may have moving forward. I would highly recommend them to everyone.
First time customer referred by neighbors. Furnace not running but after initial call service tech shows up made the repair. Zark is my new go to for heat and air. Thank you
Rob came out on Sunday to fix my furnace. He was super nice and very informative. He got my furnace up and running but they are coming back out tomorrow to install a new one. He was also very honest which is what most people look for in this type of industry. I would absolutely highly recommend Zark.
I've used Zark for the past few years and have been very happy with each time they either did maintenance or came out to fix something that was broken. The technicians work very cleanly and are super professional. Recommend 100%.
Rob, Dan, and the office crew are all top-notch. Always responsive, great troubleshooters, prompt and fast service, and always do great work. The community is fortunate to have Zark here to serve us.
I highly recommend Zark Heating & Cooling. The pre-sale inspection found a problem with my system. I had 2 weeks to get the work quoted and completed during the Christmas season. Dan arrived on time and completed the work professionally at a reasonable cost. I will use them again in the future.
We called Zark’s to fix an issue with our AC and were so impressed with them that they became our automatic go-to for all of our HVAC needs. We just had our furnace serviced and, true to form, couldn’t be happier with how thorough and knowledgeable our tech (Dan) was. It’s no accident that Zark HVAC has garnered…
Great business that responds quickly and professionally but treats customers like family.
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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 |
