Analyzing 9,863,3979.9M ReviewsFor 27,77127.8K Experts

Experts Reviews · Company report
Zark Heating & Cooling Inc. logoHow 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

Zark 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

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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.

SatisfactionSatisfaction · 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. is better than 97% of boiler installers.A
97
ReliabilityReliability · 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. is better than 96% of boiler installers.A
96
Craft & serviceCraft & service · 0% of the scoreGoogle 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. is better than 100% of boiler installers.A
100
ValueValue · 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. is better than 100% of boiler installers.A
100
MomentumMomentum · 0% of the scorePenalises 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. is better than 100% of boiler installers.A
100
Replies to reviewsReplies 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. is better than 100% of boiler installers.A
100

Reviews for your job

Customers hired Zark Heating & Cooling Inc. for 8 kinds of job.

Zark Heating & Cooling Inc. for HVAC duct & vent repair

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Jobs reviewedHow many Google reviews are tagged with this job.7
★ on this jobAverage stars on the reviews where the customer tagged this exact job (Google’s “Services” field).5.00
Usually paidThe price range customers picked most often for this job.$400–600
Rank for this jobPosition of this company in the Job match ranking for this job among the companies we track.Its Job match: 94/100.How Job match is calculatedBuilt only from reviews Google tagged “HVAC duct & vent repair”:Stars on this job 55%Number of such jobs 25%Overall Experts Score 20%Stars are pulled toward the category average when a company has few tagged jobs, so 3 perfect reviews don’t beat 80 great ones. 4.3★ scores 0, 5.0★ scores full. Volume is compared with the busiest company for this job.#2 / 7

All 7 Google reviews tagged “HVAC duct & vent repair”

MichaelLocal Guide · 59 reviewsTotal 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 2 months ago★★★★★

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.

Paid $400–600Great priceA/C system maintenanceDuctless heating & A/C servicesHeating system maintenance+ Responsiveness+ Punctuality+ Professionalism
A3 reviewsTotal 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. · 3 years ago★★★★★

Great to work with. Very professional from start to finish. Excellent communication!! Highly recommend this company.

A/C system repairHVAC duct & vent repairThermostat installation+ Responsiveness+ Punctuality+ Quality
KTP4 reviewsTotal 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. · 3 years ago★★★★★

I've been using Zark for over 15 years and recommend the company all the time. There is no one better.

A/C system maintenanceA/C filter replacementHeating system maintenance+ Responsiveness+ Punctuality+ Quality
Catherine8 reviewsTotal 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. · 3 years ago★★★★★

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…

A/C system maintenanceHeating system maintenanceHVAC duct & vent repair+ Responsiveness+ Punctuality+ Quality
Deanna11 reviewsTotal 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. · 5 years ago★★★★★

I highly recommend Zark Heating & Cooling. The pre-sale inspection found a problem with my system. I had 2 weeks to get the work quoted and completed during the Christmas season. Dan arrived on time and completed the work professionally at a reasonable cost. I will use them again in the future.

Heating system maintenanceHVAC duct & vent repairHeating system repair+ Responsiveness+ Punctuality+ Quality
MelissaLocal Guide · 29 reviewsTotal 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 5 years ago★★★★★

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.

Heating system maintenanceHVAC system maintenanceHVAC duct & vent repair
KristinLocal Guide · 19 reviewsTotal 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. · 6 years ago★★★★★

Dan did a great job replacing our dryer vent and explaining the repairs. I recommend this company to anyone needing vent or duct work.

HVAC duct & vent installationHVAC duct & vent repair+ Punctuality+ Quality+ Professionalism

Price

$2270% vs typical boiler installers

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.

Great price 48%Reasonable 49%Overpriced 2%Not sure 2%

Jobs customers hired them for

JobReviewsCategory typical
HVAC system maintenance144$37–$264
HVAC system repair93$145–$618
Heating system installation75$1.4k–$2.8k
Install AC73$1.6k–$3.2k
Heating system maintenance67$37–$317
A/C system maintenance66$39–$318
Heating system repair63$78–$745
A/C system repair45$216–$611

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