The Best Boiler Installers in Joliet, IL

Find the right company for your job

Pick the job — we re-rank companies by how customers rated that exact job.

1Zark Heating & Cooling Inc.★ 5.00 on this job63 jobs reviewedusually $100–200iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system repair”:Stars on this job 55%5.00★Number of such jobs 25%63Overall Experts Score 20%97Job 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

2Rousculp's Heating and Cooling★ 4.97 on this job37 jobs reviewedusually $1–100iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system repair”:Stars on this job 55%4.97★Number of such jobs 25%37Overall Experts Score 20%96Job 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

3Maertin Heating & Cooling★ 5.00 on this job29 jobs reviewedusually $2,000+iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system repair”:Stars on this job 55%5.00★Number of such jobs 25%29Overall Experts Score 20%93Job match= 92Stars 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.92

4Energy Services Air Conditioning & Heating Co. & Electrical★ 5.00 on this job34 jobs reviewedusually $1–200iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system repair”:Stars on this job 55%5.00★Number of such jobs 25%34Overall Experts Score 20%85Job match= 92Stars 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.92

5Service Express Heating and Air Conditioning★ 4.90 on this job72 jobs reviewedusually $200–300iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system repair”:Stars on this job 55%4.90★Number of such jobs 25%72Overall Experts Score 20%96Job match= 92Stars 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.92

6Comfort Zone Service★ 5.00 on this job17 jobs reviewedusually $2,000+iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system repair”:Stars on this job 55%5.00★Number of such jobs 25%17Overall 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

7Deljo Heating, Cooling & Plumbing★ 5.00 on this job9 jobs reviewedusually $2,000+iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system repair”:Stars on this job 55%5.00★Number of such jobs 25%9Overall Experts Score 20%95Job match= 84Stars 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.84

8Service 1 Plumbing, Heating & A/C, Inc.★ 4.86 on this job28 jobs reviewedusually $2,000+iHow Job match is calculatedBuilt only from reviews Google tagged “Heating system repair”:Stars on this job 55%4.86★Number of such jobs 25%28Overall Experts Score 20%91Job 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 repair” (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 repair

Ron1 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★★★★★

Energy Services Air Conditioning …

Excellent service and Jose is extremely thorough and informative … we always request him to perform our service. He is an excellent ambassador for ES……

Paid $1–200Reasonable priceHVAC system maintenanceHeating system repair

Lubo5 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. · 2 weeks ago★★★★★

Service Express Heating and Air C…

Service Express Heating and Air did work at my commercial building and Alex did an outstanding job explaining what needs to be fixed and why? I would highly recommend it for all your HVAC needs.

Paid $400–600Reasonable priceHVAC system repairHVAC system maintenanceHeating system repair

Kim2 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 weeks ago★★★★★

Zark Heating & Cooling Inc.

We've always had a great experience with Zark. Any tech that has come out has been knowledgeable and friendly. Would highly recommend

Reasonable priceHeating system repair

Bob1 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 3 weeks ago★★★★★

Comfort Zone Service

1 We had an issue with our furnace starting. Tim came over to check things out and within a short time, he had the furnace running like new. He was professional, courteous and efficient. Thanks Tim 2 We needed help finding out what was making a strange noise in our furnace. Josh came out, assessed the unit,… Read full review

Paid $2,000+Reasonable priceHeating system repairHeating system installation

Wendy1 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. · 3 weeks ago★★★★★

Deljo Heating, Cooling & Plumbing

George & Deljo are great! We’ve been clients of theirs for over 10 years. Never had a complaint. They are always prompt, professional, and honest. Don’t be fooled by the places that have flashy ads on local television. You won’t be disappointed with Deljo!

Paid $2,000+Great priceHVAC system repairHVAC system maintenanceA/C system maintenance

JohnLocal Guide · 22 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 month ago★★★★★

Rousculp's Heating and Cooling

The installers were professional, courteous and friendly. Todd explained how our boiler worked to our satisfaction.

Great priceHeating system repair

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 in Joliet, IL at a glance

How the 10 boiler installers we rated in Joliet, IL 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.