The Best Boiler Installers

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1Service Express Heating and Air Conditioning★ 5.00 on this job108 jobs reviewedusually $100–200iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system maintenance”:Stars on this job 55%5.00★Number of such jobs 25%108Overall Experts Score 20%96Job match= 98Stars 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.98

2Zark Heating & Cooling Inc.★ 5.00 on this job67 jobs reviewedusually $1–200iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system maintenance”:Stars on this job 55%5.00★Number of such jobs 25%67Overall Experts Score 20%97Job match= 96Stars 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.96

3Comfort Zone Service★ 5.00 on this job31 jobs reviewedusually $1–200iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system maintenance”:Stars on this job 55%5.00★Number of such jobs 25%31Overall Experts Score 20%96Job match= 91Stars 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.91

4Maertin Heating & Cooling★ 5.00 on this job31 jobs reviewedusually $200–300iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system maintenance”:Stars on this job 55%5.00★Number of such jobs 25%31Overall Experts Score 20%93Job 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

5Energy Services Air Conditioning & Heating Co. & Electrical★ 4.92 on this job119 jobs reviewedusually $1–200iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system maintenance”:Stars on this job 55%4.92★Number of such jobs 25%119Overall Experts Score 20%85Job 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

6Service 1 Plumbing, Heating & A/C, Inc.★ 4.98 on this job42 jobs reviewedusually $200–400iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system maintenance”:Stars on this job 55%4.98★Number of such jobs 25%42Overall Experts Score 20%91Job 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

7Rousculp's Heating and Cooling★ 4.95 on this job37 jobs reviewedusually $1–100iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system maintenance”:Stars on this job 55%4.95★Number of such jobs 25%37Overall Experts Score 20%96Job 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

8Deljo Heating, Cooling & Plumbing★ 4.94 on this job16 jobs reviewedusually $1–200iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system maintenance”:Stars on this job 55%4.94★Number of such jobs 25%16Overall Experts Score 20%95Job match= 83Stars 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.83

Job match = this company’s ★ on reviews Google tagged “Heating 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 heating 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

Richard5 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 3 days ago★★★★★

Service Express Heating and Air C…

Brian was great! His experience is evident as he goes about the work and when he provides a clear explanation of what he found and how he handled things. Top rate! Send Brian to our house every time! Rich and Geralyn

HVAC system maintenanceHeating system maintenance+ Responsiveness+ Punctuality+ Quality

Joanne7 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★★★★★

Comfort Zone Service

What a fantastic job Josh did with joining the annual maintenance for my furnace. He answered all my questions and informed me of all the work he did. I would use Comfort Zone in the future for my household needs. Thank you Josh Joanne

Paid $1–200Great priceHeating system maintenance

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★★★★★

Zark Heating & Cooling Inc.

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… Read full review

Paid $1–200Reasonable priceHeating system maintenance

David8 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 3 days ago★★★★★

Energy Services Air Conditioning …

Yaseen (Jessie?) was great! Personable, knowledgeable, efficient and he took the time to explain everything. I request to have him for the Spring A/C tune-up.

Paid $200–400Reasonable priceA/C system maintenanceHeating system maintenanceService not listed

Thomas1 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 6 days ago★★★★★

Service Express Heating and Air C…

Good job Got problem fixed Nice to deal with and very professional Will use again

Paid $200–400Reasonable priceHeating system maintenanceService not listed

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.