HVAC contractor · Joliet, IL · reviewed since 2018
iHow 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.97SCORE
AGradeiLetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20.
#2 of 10 boiler installersiPosition by Experts Score among all companies we track in this category. · better than 89%
5.0★★★★★891 Google reviews · 24 photos
99%five-star reviews
4.96★last 12 monthsiAverage stars on reviews from the last 12 months only.
0.5%1–2★ in 2 yearsiShare of 1–2★ reviews in the last 24 months — or the 20 newest reviews when the company had fewer than 20 in that time.
100%reviews answered by the owner
$227typical billiMedian bill customers of this company reported in their reviews (needs 3+ priced reviews).
Customers frequently highlight punctual arrivals, thorough explanations of maintenance procedures, and transparent pricing during furnace and air conditioner installations. Recurring themes include professional communication and reliable service for annual tune-ups and emergency repairs. However, a few low-star reviews criticize inaccurate diagnoses, overcharging for repairs, and poor responsiveness to phone calls or texts after initial service visits.
Google rating: 5.0 out of 5 from 891 reviews (99% five-star).
Reviews on this page: 891 Google reviews (749 with written comments, 15 with photos).
Owner responses: the business replied to 100% of reviews.
Score per factor (100 = best)iEach 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.
Zark Heating & Cooling Inc.Boiler Installers median0 = centre, 100 = best
SatisfactioniSatisfaction · 54% of the scoreRecency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.Zark Heating & Cooling Inc.: 97/100 on this factor. Category median: 95.A
97
ReliabilityiReliability · 24% of the scoreHow rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.Zark Heating & Cooling Inc.: 96/100 on this factor. Category median: 94.A
96
Craft & serviceiCraft & service · penalty only, up to −10 pointsGoogle review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.Zark Heating & Cooling Inc.: 100/100 on this factor. Category median: 100.A
100
ValueiValue · 14% of the scoreCustomers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Zark Heating & Cooling Inc.: 100/100 on this factor. Category median: 100.A
100
MomentumiMomentum · penalty only, up to −10 pointsPenalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.Zark Heating & Cooling Inc.: 100/100 on this factor. Category median: 100.A
100
Replies to reviewsiReplies to reviews · 7% of the scoreHow often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.Zark Heating & Cooling Inc.: 100/100 on this factor. Category median: 67.A
100
Bar = this company · dark tick = category median.
Star ratings
891 Google reviews we collected
5.0of 5
5 stars88299%
4 stars40%
3 stars00%
2 stars00%
1 star51%
Praise vs complaints
Phrases our text analysis found in 749 written reviews
99%praise
Praise1,70999%
Complaints181%
PriceiGoogle asks reviewers whether the price was great, reasonable or overpriced; these are their answers.
Price verdicts customers left with their Google review
98%fair
Great price7948%
Reasonable8149%
Overpriced32%
Not sure32%
$2270% vs typical boiler installers
Middle half of what 120 customers paid ($104–$383) · gold mark = category median.
Topic share
How often each topic comes up in the written reviews
7topics
Staff & attitude39123%
Speed & response36221%
Quality & results27416%
Would recommend24714%
Price & value18811%
Communication1388%
Honesty & trust1277%
What customers talk about
We read 749 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“The technician was very knowledgeable, kind and efficient.”
“The guys were here just before 7 o’clock as I said, and went to work quickly.”
“Great service by tech Zack very professional and attentive”
“terrible customer service”
“I would highly recommend Wes and Zark heating and cooling.”
“So no I cannot in good faith recommend this company to anyone else and I’m not sure how they are getting such a high rating, so I’m sure this will be erased.”
“Very happy we have a local business that cares and does great work for a good price”
“Promised me a refund for my inspection fees that I paid and never sent me a check.”
“They always explain everything they are doing, & if something needs to be replaced, you get a quote that day.”
“He was on time, very honest and got the job done in 1 day.”
People customers mention
Rob56 reviews
Bill38 reviews
Dan29 reviews
Zach24 reviews
Zack14 reviews
Keith10 reviews
praise complaint · found by our text analysis, Google review wording unchanged.
Reviews for your job
Customers hired Zark Heating & Cooling Inc. for 8 kinds of job. Pick one to see what they paid and said.
Dennis4 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 8 hours ago★★★★★
Everything wants smooth. I had been using Wes for years before he joined Zark. I would highly recommend Wes and Zark heating and cooling.
Paid $1–200Reasonable priceHVAC system maintenance
DIANE13 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 4 days ago★★★★★
The guys were here just before 7 o’clock as I said, and went to work quickly. They worked continuously to install both units and an air filter and humidifier and now I’m sitting in a nice warm house again. Rob said if I have any problems with it to let him know, fingers crossed I don’t have any. Rob, Zach and…
Paid $2,000+Great priceInstallationHeating system installation
Bernie1 reviewiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · Edited a week ago★★★★★
Very professional and reliable service.Always on time or before schedule time.Highly recommended
Paid $200–400Reasonable priceHVAC system maintenance
VirginiaLocal Guide · 15 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a week ago★★★★★
I had routine annual maintenance on my furnace. Rob was on time, professional and a pleasure to talk to.
Paid $1–200Reasonable priceHVAC system maintenance
RobertLocal Guide · 15 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a week ago★★★★★
Dread...let's talk a moment about DREAD! Like when you have no heat or car won't start or the fridge fails...here comes the DREAD!!! Today dread was present...as in no heat! However DREAD faded away when Bill said those magic words...'Covered under warranty'. Thank you Bill and Zark for being totally honest! A rare commodity!!!
Paid $1–200Great priceHVAC system repair
Erik12 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · Edited a week ago★★★★★
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…
Paid $1–200Reasonable priceHeating system maintenance
My furnace control panel went out and needed to be replaced. The technician was very knowledgeable, kind and efficient. I will definitely use Zark again, when needed.
Response from the owner · 5 hours ago
We’re glad our team was able to resolve your furnace control panel issue and that the process was smooth and efficient for you. Thank you for sharing your experience and for your trust in Zark Heating & Cooling Inc. We appreciate your recommendation and look forward to assisting you again whenever needed.
Dennis St. Leger4 reviewsiTotal number of Google reviews Dennis has written across all businesses on Google Maps, not just this one.
Everything wants smooth. I had been using Wes for years before he joined Zark. I would highly recommend Wes and Zark heating and cooling.
Price assessment: Reasonable price
Price: $1–200
Services: HVAC system maintenance
Response from the owner · 7 hours ago
It is great to hear that everything went smoothly for you. We truly appreciate your loyalty and your high recommendation for both Wes and Zark Heating & Cooling Inc. Thank you for taking the time to share your experience, and for placing your trust in us.
DIANE DEWEY13 reviewsiTotal number of Google reviews DIANE has written across all businesses on Google Maps, not just this one.
The guys were here just before 7 o’clock as I said, and went to work quickly. They worked continuously to install both units and an air filter and humidifier and now I’m sitting in a nice warm house again. Rob said if I have any problems with it to let him know, fingers crossed I don’t have any. Rob, Zach and Connor, were polite and cleaned up their work area very nicely. Both units and an air filter and humidifier. Now I’m sitting in a nice warm house just in time for the cold weather.
Thank you Zark Heating!!❣️
Price assessment: Great price
Price: $2,000+
Services: Installation, Heating system installation
Response from the owner · 4 days ago
What a great update, Diane! It means a lot that you took the time to share these details. We're glad the installation went smoothly and you're enjoying a comfortable, warm home just in time for the cold weather. Thank you for choosing Zark Heating & Cooling Inc.—your feedback is truly appreciated!
Ashley HernandezLocal Guide · 80 reviewsiTotal number of Google reviews Ashley has written across all businesses on Google Maps, not just this one.
We love Zark! Have been using them for the past 3 years, and never had a bad experience.
All the techs are SO nice, and very well knowledgeable. They always explain everything they are doing, & if something needs to be replaced, you get a quote that day.
Will forever use Zark!!
Price assessment: Great price
Services: HVAC system maintenance
Response from the owner · a week ago
Ashley, your loyalty over the past 3 years truly means a lot to us. We're so glad to know our technicians have been friendly, knowledgeable, and thorough each time you call. Thank you for sharing such kind words and for making Zark Heating & Cooling Inc. your go-to for HVAC service. We look forward to being there for all your comfort needs in the years ahead!
Connie BoldaLocal Guide · 45 reviewsiTotal number of Google reviews Connie has written across all businesses on Google Maps, not just this one.
Kyle did an excellent job for us! Totally satisfied with the service!
Price assessment: Reasonable price
Services: HVAC system maintenance
Response from the owner · Edited a week ago
We appreciate you sharing your experience, Linda. It's great to hear you were completely satisfied with the service provided by our team member. Thank you for choosing Zark Heating & Cooling Inc. and letting us know we did a good job for you! We hope to help you again whenever you need us.
John B10 reviewsiTotal number of Google reviews John has written across all businesses on Google Maps, not just this one.
Bill, thank you for your business and also I'd like to thank you for leaving an awesome 5-star review. Let us know if you need anything else in the future for your HVAC needs!!
Bernie1 reviewiTotal number of Google reviews Bernie has written across all businesses on Google Maps, not just this one.
Very professional and reliable service.Always on time or before schedule time.Highly recommended
Price assessment: Reasonable price
Price: $200–400
Services: HVAC system maintenance
Response from the owner · 2 years ago
Bernie thank you for your great review!!! It looks like Rob was your technician I'll let him know!!!!
Virginia GallagherLocal Guide · 15 reviewsiTotal number of Google reviews Virginia has written across all businesses on Google Maps, not just this one.
I had routine annual maintenance on my furnace. Rob was on time, professional and a pleasure to talk to.
Price assessment: Reasonable price
Price: $1–200
Services: HVAC system maintenance
Response from the owner · a week ago
We appreciate you sharing your experience, Virginia. It's great to hear that your annual furnace maintenance visit went smoothly and was handled professionally. Thank you for choosing Zark Heating & Cooling Inc. for your service, and we look forward to helping you keep your home comfortable year after year.
