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 maintenance
Clear ✕All 67 Google reviews tagged “Heating system maintenance” · showing 40
Rob was our technician today for our annual furnace tune up and he is the absolute best! Incredibly personable, professional and polite. We’ve had him out several times now and he always does a thorough job and answers any questions or concerns we may have. We have had nothing but a fantastic experience with Zark…
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…
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.
Highly recommend Zark!!! fast, reliable service.
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…
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…
Rob and his men have been keeping my 50+ A/C unit running and have never tried to sell me a new one. They see pride in keeping this one running efficiently! They are trustworthy, dependable and their pricing is fair and they have a good service contract.
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.
Very good on services.
Zark is reliable, efficient, honest and trustworthy and friendly. We have always received top notch service from them. Recommend them 100%.
Had Zach from Zark come out to do the annual furnace check. Great experience. I asked if he wouldn't mind checking the water line that goes into the humidifier. I was concerned that water had stopped going through because of calcification. Zach said it was working just fine. Another great experience with Zark!!
Great experience, very responsive and great work, Zach was prompt courteous and explained everything thoroughly
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
Outstanding service. Dan was very professional and we are very satisfied with the work. I would highly recommend them to everyone.
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.
Have to honestly say this company is fantastic. Pedro Silva, the technician, was thorough and quick. Pleasant and respectful. Just found a real HVAC company today Thanks Zark Thanks again Pedro
I have used Zark Heating & Cooling a few times over the last few years. They are always quick to respond. The service is always great and prices are reasonable.
Zark heating will be my new furnace and air conditioner check yearly and repair service company! Rob was very knowledgeable and I was very pleased with his work! I never write reviews but I wrote this one because it is hard to find a company like this one!!! Very Pleased! Will refer to friends and family!
I've been a customer for many years and can't say enough about the professionalism and quality.
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.
Always great service in a timely manner. Everything from maintenance, emergencies to new duct work. Zark has done it all for us and we’ve always been pleased!
Zark HVAC is a very honorable and professional service provider. I would highly recommend using them.
On one of the coldest nights our heater stopped working properly. Called early this morning. Got a text almost immediately and Dan was out to look at it almost 2 hrs sooner than expected. It was thankfully a simple fix and Dan got it up and running quickly. He explained everything and gave great tips to keep it…
I've been using Zark for over 15 years and recommend the company all the time. There is no one better.
Very good service professional 👍
Rob and Bill took care of everything. I was amazed by the service. Zark showed a quality of days gone by. There was no high pressure sales to deal with. They worked with me to meet my needs and I felt understood. They made me feel respected. I felt my home was respected as well.
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…
Rob also installed a new hot water tank and disposed the old one for me...First class company from top to bottom...Very fair pricing...Zark is and will be my only heating repair company...Rob is an awesome person to do business with...
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.
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…
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…
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…
I called early Sunday morning with the problem of no heat. They sent someone out by 10am to resolve the issue. Keith was so kind and professional. Definitely using this company again when needed!
Professional, punctual, polite, clean. Have done business with Zark in the past and will continue to do so.
Dan was great and professional
They were very responsive and answered our call on a Sunday evening!
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.
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 |
