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” · showing 20
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.
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 |
