HVAC contractor · Joliet, IL · reviewed since 2026
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%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.95SCORE
AGradeiLetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20.
#6 of 10 boiler installersiPosition by Experts Score among all companies we track in this category. · better than 44%
5.0★★★★★426 Google reviews · 22 photos
97%five-star reviews
4.95★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
$383typical billiMedian bill customers of this company reported in their reviews (needs 3+ priced reviews).
Customers frequently praise the company for professional, thorough service and clear communication regarding system repairs and maintenance options. Reviews highlight punctuality, clean work practices, and helpful explanations of HVAC and plumbing issues. The high rating is supported by consistent feedback on technician courtesy and efficiency. One low-star review cites a significant price discrepancy compared to an external second opinion, suggesting potential concerns about cost transparency for specific repairs.
Google rating: 5.0 out of 5 from 426 reviews (97% five-star).
Reviews on this page: 426 Google reviews (304 with written comments, 9 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: momentum and replies to reviews; weakest: value.
This companyBoiler 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.Deljo Heating, Cooling & Plumbing: 95/100 on this factor. Category median: 95.A
95
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.Deljo Heating, Cooling & Plumbing: 97/100 on this factor. Category median: 94.A
97
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.Not enough reviews for this factor yet. Category median: 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.Deljo Heating, Cooling & Plumbing: 88/100 on this factor. Category median: 100.A
88
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.Deljo Heating, Cooling & Plumbing: 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.Deljo Heating, Cooling & Plumbing: 100/100 on this factor. Category median: 67.A
100
Bar = this company · dark tick = category median.
Star ratings
426 Google reviews we collected
5.0of 5
5 stars41297%
4 stars123%
3 stars00%
2 stars00%
1 star20%
Praise vs complaints
Phrases our text analysis found in 304 written reviews
100%praise
Praise561100%
Complaints00%
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 price4219%
Reasonable15769%
Overpriced42%
Not sure2411%
$383+68% vs typical boiler installers
Middle half of what 175 customers paid ($78–$1.1k) · gold mark = category median.
Topic share
How often each topic comes up in the written reviews
7topics
Staff & attitude16329%
Quality & results12021%
Speed & response10819%
Communication8515%
Would recommend458%
Price & value204%
Honesty & trust204%
What customers talk about
We read 304 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“Matt performed the annual maintenance on our furnace, humidifier, and water heater with a lot of professionalism and care.”
“Angel did a great job representing Deljo completing our winter HVAC maintenance”
“Bashar was very efficient and fixed the issue with our tankless water heater.”
“Justin is an excellent technician and kept me updated on appointments and progress in locating correct replacement parts.”
“Great service communication on time wonderful experience highly recommend!”
“He arrived in the early part of our service window, was friendly and knowledgeable, and got the work done in a very reasonable amount of time.”
“Very detailed and honest assessment of aging system.”
People customers mention
Izzy8 reviews
Drew4 reviews
Matt4 reviews
Gonzalez4 reviews
Ernesto4 reviews
Adrian3 reviews
praise complaint · found by our text analysis, Google review wording unchanged.
What reviewers say about Deljo Heating, Cooling & Plumbing
From 24 detailed written reviews; every point below is quoted in at least one review.
Mentioned most: Explains clearly (11 praise); Professionalism (10 praise); Friendly & courteous (9 praise); Quality of work (9 praise); Would recommend (6 praise); Punctuality (5 praise); Communication (4 praise); Expertise (4 praise).
Reported results: 1 problem fixed.
Jobs reviewed: furnace (2).
Returning customers: 4 reviewers say they used Deljo Heating, Cooling & Plumbing before.
👍 “Kept me updated on appointments”
👍 “Justin is an excellent technician”
👍 “With a lot of professionalism”
👎 “Scheduling was somewhat problematic”
Reviews for your job
Customers hired Deljo Heating, Cooling & Plumbing for 8 kinds of job. Pick one to see what they paid and said.
James1 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. · 4 days ago★★★★★
Justin did an incredible job! He was very professional, competent and clean.
I would recommend him to anyone.
Paid $1,400–1,600Reasonable price
Quincy3 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★★★★★
Alan was more than exceptional. I really appreciated how respectful and accommodating he was to my home/family. He did a thorough job checking my HVACs and set me up with good maintenance plan options. Great service and excellent human being. Even my cats think so.
Paid $1–200Reasonable priceHVAC system maintenance
Carlos2 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★★★★★
I'm very satisfied we are very extremely very satisfied with his job performance we.give him 5 thump.up.extrenely satisfy
Paid $1–200Great priceHVAC system maintenance
Cory7 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 2 weeks ago★★★★★
Jonathan was a true professional. He was on time, courteous and easy to work with. He got to work and when the time was right, provided options that best suited our needs. Would continue to recommend Deljo and now they do plumbing!
Paid $400–600Great priceHVAC system maintenance
David14 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★★★★★
Very thorough and explained our system well. Great communication. And provided insight into other systems in our basement.
Paid $1–200Great priceHeating system maintenance
Gregory5 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★★★★★
Joe was extremely professional. He explained what he had done, and offered options for future maintenance. Very pleased!
Justin did an incredible job! He was very professional, competent and clean.
I would recommend him to anyone.
Price assessment: Reasonable price
Price: $1,400–1,600
Response from the owner · a day ago
Thanks for sharing your feedback, James! We appreciate your kind words about our team and are glad to know that you had a positive experience. Your recommendation means a lot to us.
Ed Member LLC1 reviewiTotal number of Google reviews Ed has written across all businesses on Google Maps, not just this one.
We appreciate your kind words, Ed! It's great to know that our team provided thorough and professional service. Your feedback motivates us to continue delivering the best for our customers.
David Meri4 reviewsiTotal number of Google reviews David has written across all businesses on Google Maps, not just this one.
Izzy was courteous,, transparent and prompt. Would definitely use again.
Price assessment: Great price
Price: $1–200
Response from the owner · a day ago
Thank you so much, David! We appreciate your kind words about our team and are glad to know that you found our service courteous, transparent, and prompt. Your satisfaction is important to us, and we look forward to serving you again in the future.
Howard Edelman2 reviewsiTotal number of Google reviews Howard has written across all businesses on Google Maps, not just this one.
Rich did a great job. He was very informative throughout the processes.
Price assessment: Reasonable price
Price: $2,000+
Services: Heating system installation, Thermostat installation
Response from the owner · a week ago
Thank you so much, Howard! We appreciate your kind words about our team and are glad to know that Rich provided you with informative service throughout the process. Your feedback motivates us to continue delivering quality experiences.
Sharon Llamas12 reviewsiTotal number of Google reviews Sharon has written across all businesses on Google Maps, not just this one.
Angel did a great job representing Deljo completing our winter HVAC maintenance
Price assessment: Reasonable price
Price: $2,000+
Services: HVAC system maintenance, Service not listed
Response from the owner · 3 months ago
Thanks a lot, Sharon! We appreciate your kind words about our team and are glad you had a positive experience with our new plumbing services. Your feedback encourages us to continue delivering quality service!
William Armstrong1 reviewiTotal number of Google reviews William has written across all businesses on Google Maps, not just this one.
Plumbing repair on previously installed kitchen faucet. Scheduling was somewhat problematic, but work was done at no charge. Justin is an excellent technician and kept me updated on appointments and progress in locating correct replacement parts.
Price assessment: Reasonable price
Response from the owner · 2 weeks ago
Thank you so much, William! We appreciate your kind words about our team and are glad to hear that your plumbing repair was handled effectively. It's great to know that you were kept updated throughout the process. Your feedback helps us continue to improve our scheduling and service.
Nadine van Veen6 reviewsiTotal number of Google reviews Nadine has written across all businesses on Google Maps, not just this one.
Matt performed the annual maintenance on our furnace, humidifier, and water heater with a lot of professionalism and care. Can’t recommend them enough!
Response from the owner · 2 weeks ago
Thank you so much, Nadine! We appreciate your kind words about our team’s professionalism and care during the maintenance of your furnace, humidifier, and water heater. Your recommendation means a lot to us!
Quincy Bradford3 reviewsiTotal number of Google reviews Quincy has written across all businesses on Google Maps, not just this one.
Alan was more than exceptional. I really appreciated how respectful and accommodating he was to my home/family. He did a thorough job checking my HVACs and set me up with good maintenance plan options. Great service and excellent human being. Even my cats think so.
Price assessment: Reasonable price
Price: $1–200
Services: HVAC system maintenance
Response from the owner · 2 weeks ago
Thank you so much, Quincy! We appreciate your kind words about our team and are glad to know that you had a positive experience with our service. It's great to hear that Alan was respectful and accommodating while thoroughly checking your HVACs and setting you up with maintenance plan options. Your satisfaction means a lot to us, and we're glad even your cats approve!
amy hillgamyerLocal Guide · 19 reviewsiTotal number of Google reviews amy has written across all businesses on Google Maps, not just this one.
Thanks for sharing your feedback, Amy! We appreciate your kind words about our team's timeliness and professionalism. It's great to know that you had a positive experience.
Nathan Grantier5 reviewsiTotal number of Google reviews Nathan has written across all businesses on Google Maps, not just this one.
Ernesto was helpful, detailed and professional. We appreciated the thorough explanation and walking us through the repair process. Would recommend.
Services: HVAC system repair, HVAC system maintenance
Response from the owner · 2 weeks ago
Thank you so much, Nathan! We appreciate your kind words about our team and are glad to hear that you found the explanation and repair process thorough and professional. Your recommendation means a lot to us!
