The Best Boiler Installers

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1Service Express Heating and Air Conditioning★ 4.98 on this job228 jobs reviewedusually $100–200iHow Job match is calculatedBuilt only from reviews Google tagged “HVAC system maintenance”:Stars on this job 55%4.98★Number of such jobs 25%228Overall Experts Score 20%96Job match= 94Stars are pulled toward the category average (4.92★) 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.94

2Zark Heating & Cooling Inc.★ 4.99 on this job146 jobs reviewedusually $100–200iHow Job match is calculatedBuilt only from reviews Google tagged “HVAC system maintenance”:Stars on this job 55%4.99★Number of such jobs 25%146Overall Experts Score 20%97Job match= 93Stars are pulled toward the category average (4.92★) 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.93

3Rousculp's Heating and Cooling★ 4.99 on this job74 jobs reviewedusually $100–200iHow Job match is calculatedBuilt only from reviews Google tagged “HVAC system maintenance”:Stars on this job 55%4.99★Number of such jobs 25%74Overall Experts Score 20%96Job match= 90Stars are pulled toward the category average (4.92★) 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.90

4Comfort Zone Service★ 4.96 on this job108 jobs reviewedusually $1–200iHow Job match is calculatedBuilt only from reviews Google tagged “HVAC system maintenance”:Stars on this job 55%4.96★Number of such jobs 25%108Overall Experts Score 20%96Job match= 90Stars are pulled toward the category average (4.92★) 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.90

5Deljo Heating, Cooling & Plumbing★ 4.96 on this job108 jobs reviewedusually $1–200iHow Job match is calculatedBuilt only from reviews Google tagged “HVAC system maintenance”:Stars on this job 55%4.96★Number of such jobs 25%108Overall Experts Score 20%95Job match= 89Stars are pulled toward the category average (4.92★) 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.89

6Windy City HVAC Repair★ 4.98 on this job53 jobs reviewedusually $1–200iHow Job match is calculatedBuilt only from reviews Google tagged “HVAC system maintenance”:Stars on this job 55%4.98★Number of such jobs 25%53Overall Experts Score 20%99Job match= 88Stars are pulled toward the category average (4.92★) 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.88

7Maertin Heating & Cooling★ 4.98 on this job43 jobs reviewedusually $100–200iHow Job match is calculatedBuilt only from reviews Google tagged “HVAC system maintenance”:Stars on this job 55%4.98★Number of such jobs 25%43Overall Experts Score 20%93Job match= 86Stars are pulled toward the category average (4.92★) 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.86

8Energy Services Air Conditioning & Heating Co. & Electrical★ 4.86 on this job557 jobs reviewedusually $1–200iHow Job match is calculatedBuilt only from reviews Google tagged “HVAC system maintenance”:Stars on this job 55%4.86★Number of such jobs 25%557Overall Experts Score 20%85Job match= 86Stars are pulled toward the category average (4.92★) 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.86

Job match = this company’s ★ on reviews Google tagged “HVAC system maintenance” (shrunk toward the category average when there are few), how many such jobs it has done, and its overall Experts Score.

What customers said about HVAC system maintenance

Terry5 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. · 3 hours ago★★★★★

Service Express Heating and Air C…

Rudi was here for a pre-winter tuneup of my furnace. When I asked him what was involved in a tuneup, he took the time to explain all the things he was going to check out or adjust on the furnace. I believe he did a thorough job, so I am quite pleased with the service.

Great priceHVAC system maintenance

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★★★★★

Zark Heating & Cooling Inc.

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

Don14 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 10 hours ago★★★★★

Energy Services Air Conditioning …

Competent, friendly, efficient. Very pleased with knowledge, explanations and service.

Reasonable priceHVAC system maintenanceHeating system maintenance

Cathy5 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 day ago★★★★★

Comfort Zone Service

I’ve had different companies coming out every year since I’ve lived here for the annual cleaning. Finally someone that spent some actual, real time with the unit, and who took the time to explain things as well as show me pictures. Josh was the best! As are the girls in the office. Would give a 10 if I could!

Paid $1–200Great priceHVAC system maintenance

Kevin13 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 day ago★★★★★

Service Express Heating and Air C…

Service Express has always been professional every time I have used their service. I have used them for routine service, cleanings and full replacements. Would recommend them for any.

Paid $100–200Reasonable priceHVAC system maintenanceA/C system maintenance

Regina4 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 day ago★★★★★

Energy Services Air Conditioning …

Caprell from Energy Services is an exceptional technician. He is professional, knowledgeable, kind and most importantly honest. I recommend Energy Services with a high recommendation of Caprell and Leo. It can be a challenge finding service individuals with such characteristics, but I am pleased with having experienced Thank you!

Paid $1–200Not sureHVAC system maintenance

Overall ratings

Experts Score 0–100iExperts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. and a letter grade per factor (A = top 20% of boiler installers).

#	Company	ScoreiExperts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown.	FactorsiFactor grades, in orderSatisfaction (54%): Recency-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.Reliability (24%): How 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.Craft & service (0%): Google 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.Value (14%): Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Momentum (0%): Penalises 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.Replies to reviews (7%): How 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.One letter per factor score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = below 20.	★iGoogle star rating as shown on Google Maps.	Typical billiMedian bill customers of this company reported in their reviews (needs 3+ priced reviews).
1	Windy City HVAC RepairJoliet, IL	A 99iHow 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 59%99+58.1Reliability 26%99+25.8Value 15%100+15.2Experts Score= 99Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AA–AA–	4.99	$166
2	Zark Heating & Cooling Inc.Joliet, IL	A 97iHow 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.	AAAAAA	4.97	$227
3	Rousculp's Heating and CoolingJoliet, IL	A 96iHow 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%99+54Reliability 24%99+24Value 14%100+14.1Replies to reviews 7%58+4.1Experts Score= 96Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AAAAAC	4.98	$161
4	Comfort Zone ServiceJoliet, IL	A 96iHow 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%95+51.8Reliability 24%93+22.5Value 14%100+14.1Replies to reviews 7%100+7.1Experts Score= 96Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AAAAAA	4.96	$248
5	Service Express Heating and Air ConditioningJoliet, IL	A 96iHow 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%95+51.8Reliability 24%94+22.8Value 14%100+14.1Replies to reviews 7%100+7.1Experts Score= 96Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AAAAAA	4.94	$228
6	Deljo Heating, Cooling & PlumbingJoliet, IL	A 95iHow 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%95+51.8Reliability 24%97+23.5Value 14%88+12.4Replies to reviews 7%100+7.1Experts Score= 95Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AA–AAA	4.95	$383
7	Maertin Heating & CoolingJoliet, IL	A 93iHow 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%96+52.4Reliability 24%94+22.8Value 14%100+14.1Replies to reviews 7%58+4.1Experts Score= 93Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AAAAAC	4.98	$423
8	Service 1 Plumbing, Heating & A/C, Inc.Joliet, IL	A 91iHow 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%92+50.2Reliability 24%91+22.1Value 14%100+14.1Replies to reviews 7%67+4.7Craft & service penalty98−0.2Experts Score= 91Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AAAAAB	4.90	$283
9	Energy Services Air Conditioning & Heating Co. & ElectricalJoliet, IL	A 85iHow 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%86+46.9Reliability 24%85+20.6Value 14%97+13.7Replies to reviews 7%59+4.2Craft & service penalty99−0.1Experts Score= 85Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AAAAAC	4.89	$166
10	Omega Plumbing Heating and CoolingJoliet, IL	A 85iHow 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%89+48.5Reliability 24%85+20.6Value 14%89+12.6Replies to reviews 7%60+4.2Craft & service penalty87−1.3Experts Score= 85Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.	AAAAAB	4.87	$383

What jobs cost

What customers paid, from the price Google asks reviewers to report.

Boiler Installers at a glance

How the 10 boiler installers we rated compare, and what customers praise most.

How we grade

Satisfaction (54%) — Recency-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.

Reliability (24%) — How 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.

Craft & service (penalty, up to −10) — Google 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.

Value (14%) — Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.

Momentum (penalty, up to −10) — Penalises 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.

Replies to reviews (7%) — How 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.