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 install thermostat
Clear ✕All 20 Google reviews tagged “Install thermostat”
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! 👍
Wess did a great job for us. He was on time, very honest and got the job done in 1 day. Very knowledgeable and a good teacher for his partner Conner who was very helpful explaining the new thermostat. Thank-you Wess and Connor.
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.
They are very professional. Quality work and equipment. They clean up nicely when done. I will recommend them to everyone.
I couldn’t be more pleased with the installation of our new furnace and a/c unit. Zark Heating was absolutely wonderful to work with. Very responsive to my questions and their communication with me was outstanding!!! Dan was always very responsive and informative, no matter how busy he was. It is such a relief to…
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…
Excellent customer service, quality work & product! I would use Zark again in a heartbeat! Can’t say 1 negative thing.
Zark Heating and Cooling installed a new furnace, new A/C system and a tankless hot water heater. The job was done flawlessly and professionally! I highly recommend Zark!
I highly recommend Zark and I will use them again for all my HVAC needs.
I have used Zark time and time again! Professional, courteous, on time, and explains everything they are doing. Dan and his teammate did an awesome job installing my garage heater. I had a couple of requests regarding the install and they did everything I had asked. Keep up the great work Zark! You won't be dissapointed when using this company!
Reliable and professional. Responds promptly and great communication. Highly recommended. Thank you!
Had recommended them as an option to my elderly neighbor after seeing positive reviews. Rob was friendly, helpful, and knowledgeable. He answered all her questions, made her comfortable with her choice (she got multiple quotes as a safety precaution), made she understood everything, etc. I also had my 30 yr old…
ZARK is a great company to work with! They were professional and had the best quote. The quality of work is exceptional and they took the time to explain how everything works. I highly recommend ZARK for your HVAC needs!
Have used Zark a few times for different services. Fair, honest pricing and good follow-up. Willing to repair instead of rushing to replace. Helped us get a few more years out of our AC unit. Highly recommend, good people to do business with.
Unreal! These guys are spot on. Great work and flexible. Big shouts to Rob and his crew!
Highly recommend Zark. The owner and all the employees are very professional. The work was excellent and fairly priced. We will definitely use again for all services offered by Zark.
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.
Rating only, no written review.
Rating only, no written review.
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 |
