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 repair HVAC
Clear ✕All 33 Google reviews tagged “Repair HVAC”
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.
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…
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…
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.
This company is tops in customer service, timely installation and repair and fair pricing. The labor they provide is highly skilled and very impressive. Don’t bother comparing, they are the BEST!!
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.
Honest, fair and fast. Can’t ask for much more. My go-to HVAC company for business and residential.
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.
Rob and crew were prompt and professional
I had a great experience using Zark. They were knowledgeable and honest when it came to my repairs and why it made sense to replace my a/c unit after refilling the coolant didn't work. Price was very fair and significantly less than the major HVAC company in the area.
I called to make an appointment. They were out the same day. They worked quickly and the price was right in line. I'll not only use them again but will highly recommend them.
I had a unit with the furnace (which is about a 20 year old unit) not functioning properly on the coldest day of the year. I called Zark and they were out there within 3 hours. They fixed the issue and it has run like a dream since. Would highly recommend.
I've been using Zark for over 15 years and recommend the company all the time. There is no one better.
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.
I used Zark when I needed a repair made on my furnace. They were able to get me scheduled quickly, made the repair quickly and were affordable. Very professional and great service all around. Highly recommend.
The greatest and best company around. These guys are HONEST.
I hadan electric furnace that was blowing cold air. I had a different hvac contractor originally diagnose the problem. They said I needed a new air handler, heating element is bad and no parts. I called ZARK for a 2nd opinion. The diagnosed my heating element was fine and I had a bad sequencer. They found my…
Bought a brand new A/C and furnace from Zark in May of 2021. Yesterday the A/C started to cycle on and off. Called Zark on Sunday and Keith came out to see what’s going on with my unit. Monday Keith found that unit was low on refrigerant and has a leak somewhere. Keith charged unit on Sunday and put a dye in system…
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!
Not only is rob the owner of the company amazing but his wife Christy who is the manager she takes the calls and makes sure the guys who are going To your house are squared away. As a police officer I trust them to take care of my heating and ac that makes my family comfortable. Great company.
Family owned business! Friendly honest business!! Best HVAC company anywhere!!!
So when nobody else would answer at 450 pm when calling for a semi emergency, Zark answered AND had a tech out the next day at 8am. After doing buisness with them as a random google search, im defitnitly calling them for my next job. i especially wont need to waste time searching google for HVAC companies that…
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.
Zark has been great with all of our HVAC needs. Always on time and very reasonable with pricing. Rob goes above and beyond for all his customers. Very professional and clean. Everyone in this company that I have dealt wi with is professional and I know I can trust them in my home.
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 |
