HVAC contractor · San Jose, CA · reviewed since 2025
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 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.99SCORE
AGradeiLetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20.
#3 of 50 heat pump installation servicesiPosition by Experts Score among all companies we track in this category. · better than 96%
5.0★★★★★143 Google reviews · 23 photos
99%five-star reviews
4.99★last 12 monthsiAverage stars on reviews from the last 12 months only.
0%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.
97%reviews answered by the owner
$1.2ktypical billiMedian bill customers of this company reported in their reviews (needs 3+ priced reviews).
Customers describe Ozone Service as punctual, knowledgeable, and efficient in handling AC and heating repairs, installations, and diagnostics. Reviews highlight clear communication, accurate pricing, and the inclusion of permit management and long-term maintenance in their services. One recurring criticism involves delays in finalizing city permits, though most feedback remains positive regarding the speed and professionalism of the on-site technicians.
Google rating: 5.0 out of 5 from 143 reviews (99% five-star).
Reviews on this page: 143 Google reviews (113 with written comments, 7 with photos).
Owner responses: the business replied to 97% of reviews.
Most recent review: October 25, 2026.
Service: Heat Pump Installation Service serving San Jose, California.
Data from Google, last updated October 25, 2026.
Score profile vs other heat pump installation services
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: value and momentum; weakest: reliability.
Ozone ServiceHeat Pump Installation Services 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.Ozone Service: 99/100 on this factor. Category median: 92.A
99
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.Ozone Service: 99/100 on this factor. Category median: 90.A
99
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: 95.–
–
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.Ozone Service: 100/100 on this factor. Category median: 100.A
100
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.Ozone Service: 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.Not enough reviews for this factor yet. Category median: 63.–
–
Bar = this company · dark tick = category median.
Star ratings
143 Google reviews we collected
5.0of 5
5 stars14299%
4 stars11%
3 stars00%
2 stars00%
1 star00%
Praise vs complaints
Phrases our text analysis found in 113 written reviews
99%praise
Praise27199%
Complaints21%
PriceiGoogle asks reviewers whether the price was great, reasonable or overpriced; these are their answers.
Price verdicts customers left with their Google review
100%fair
Great price2837%
Reasonable3951%
Overpriced00%
Not sure912%
$1.2k+171% vs typical heat pump installation services
Middle half of what 56 customers paid ($417–$2.1k) · gold mark = category median.
Topic share
How often each topic comes up in the written reviews
7topics
Speed & response6624%
Staff & attitude6022%
Would recommend4215%
Quality & results4015%
Price & value2911%
Communication218%
Honesty & trust155%
What customers talk about
We read 113 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“Ilya arrived right on time, quickly diagnosed the AC issue, and explained that my parts were covered under warranty.”
“He was excellent, patient and on top of everything, and the installers were very competent and all went smoothly.”
“I would highly recommend Ozone Service and Konstantin.”
“I'm just so glad I found the incredible team at Ozone, and I cannot recommend them more.”
“Oliver has done a great job ensure the city inspection went through and he has done extra effort to make things go smoothly.”
“Come for free estimate on time and very professional.”
“He was very helpful in explaining everything for us.”
“Konstantin is extremely knowledgeable, experienced, and completely honest.”
People customers mention
Andrew9 reviews
Konstantin7 reviews
Alex4 reviews
Ilya3 reviews
Area3 reviews
praise complaint · found by our text analysis, Google review wording unchanged.
Reviews for your job
Customers hired Ozone Service for 8 kinds of job. Pick one to see what they paid and said.
Ollie14 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 14 hours ago★★★★
Update: they have trouble following up with city to finalize the permit. The permit is still not finaled after 6 months.
We just had them replace our duct and add Gree AC heat pump in San Mateo. Happened to have a factory-defective TXV in the beginning but they acted fast to replace a new one. You’ll know why they…
Paid $2,000+HVAC duct & vent installationInstall AC
Sean4 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★★★★★
Great experience during a heatwave! Ilya arrived right on time, quickly diagnosed the AC issue, and explained that my parts were covered under warranty. He also gave me clear advice on potential future issues with my overall system. Very honest, knowledgeable, and punctual. Highly recommended!
Paid $200–400Great priceHVAC system repair
Vinh6 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 month ago★★★★★
Called OZONE late Friday night and had Andrew out by 8am Saturday. He diagnosed the failed starting component quickly, had the part on the truck, and had the system running and verified cold before he left. On time, no upselling on a old unit, one-year warranty on the repair. Exactly what you want from a service call. Highly recommend.
Paid $400–600Reasonable priceHVAC system repair
Ed1 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. · 2 months ago★★★★★
Konstantine and Paul (and one other) were excellent. Price as the best among 5 quotes. Professional. Replaced our 3.5 ton carrier gas+AC with a daikin 3.5 ton heat pump in 2 days (all to code with permits, inspectors pending).
Paid $2,000+Great priceHeating system installationInstall AC
Evan3 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 months ago★★★★★
From requesting service to completing service took no longer than 24 hours. Luckily it wasn't too hot but it was going to get hotter soon. Reassured that the coolant was not a problem. Turned out to be an electrical issue for the compressor. Also explained the air distribution system. The technician was patient with my hearing issues 🙉 I recommend them.
Paid $400–600Reasonable priceA/C system repair
JustinLocal Guide · 39 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 months ago★★★★★
My AC unit had not been maintained for quite some time, and the technician conducted thorough cleaning and repairs.
Paid $800–1,000Not sureA/C system maintenanceA/C system repair
Update: they have trouble following up with city to finalize the permit. The permit is still not finaled after 6 months.
We just had them replace our duct and add Gree AC heat pump in San Mateo. Happened to have a factory-defective TXV in the beginning but they acted fast to replace a new one. You’ll know why they have all 5-star on google. Already shout out their name to all my friends. Hope they grow their business while keeping the best service and price. Then we would hire them to update everything again after a decade.
Price: $2,000+
Services: HVAC duct & vent installation, Install AC
Response from the owner · 6 months ago
Thank you, Ollie, for taking the time to leave this review. We’re glad we could quickly resolve the factory-defective TXV and that your new Gree heat pump and duct work are performing well. We appreciate you recommending us to your friends and your support as our business grows. We look forward to updating everything again when the time comes and will keep delivering great service at fair prices.
Sean4 reviewsiTotal number of Google reviews Sean has written across all businesses on Google Maps, not just this one.
Great experience during a heatwave! Ilya arrived right on time, quickly diagnosed the AC issue, and explained that my parts were covered under warranty. He also gave me clear advice on potential future issues with my overall system. Very honest, knowledgeable, and punctual. Highly recommended!
Price assessment: Great price
Price: $200–400
Services: HVAC system repair
Response from the owner · 2 weeks ago
Thank you, Sean. We are glad Ilya arrived on time, diagnosed the AC quickly, and clarified the warranty coverage. We appreciate that his system advice was useful and that you found him honest and knowledgeable. Thanks for recommending us, and we look forward to helping you again.
Dee Stewart7 reviewsiTotal number of Google reviews Dee has written across all businesses on Google Maps, not just this one.
I got a new furnace installed with Ozone Service and was helped by Konstantin. He was excellent, patient and on top of everything, and the installers were very competent and all went smoothly. I would highly recommend Ozone Service and Konstantin.
Chubbi Rajagopal7 reviewsiTotal number of Google reviews Chubbi has written across all businesses on Google Maps, not just this one.
Andrew from ozone came for diagnostic. He was very helpful in explaining everything for us. I would highly recommend ozone.
Services: HVAC system repair
Response from the owner · a month ago
Thank you, Chubbi Rajagopal. We're glad Andrew's diagnostic visit and clear explanations were helpful. Your recommendation means a great deal to our team. We look forward to assisting you again in the future.
Gregory Lulyev3 reviewsiTotal number of Google reviews Gregory has written across all businesses on Google Maps, not just this one.
Konstantin is extremely knowledgeable, experienced, and completely honest. He analyzed all potential scenarios and gave 100% accurate information without any guesswork. Truly professional and reliable
Response from the owner · a month ago
Thank you, Q QQQ. We appreciate you recognizing Konstantin's expertise, honesty, and careful analysis. Hearing that his clear, accurate guidance was helpful means a great deal to our team. We value your trust and look forward to helping you again.
Satish (Sunny)Local Guide · 48 reviewsiTotal number of Google reviews Satish has written across all businesses on Google Maps, not just this one.
We're glad to hear you had a very good experience, Satish (Sunny). Your feedback means a lot to our team and helps us keep delivering quality service. We appreciate your support and look forward to serving you again.
Vinh Le6 reviewsiTotal number of Google reviews Vinh has written across all businesses on Google Maps, not just this one.
Called OZONE late Friday night and had Andrew out by 8am Saturday. He diagnosed the failed starting component quickly, had the part on the truck, and had the system running and verified cold before he left. On time, no upselling on a old unit, one-year warranty on the repair. Exactly what you want from a service call. Highly recommend.
Price assessment: Reasonable price
Price: $400–600
Services: HVAC system repair
John Waite6 reviewsiTotal number of Google reviews John has written across all businesses on Google Maps, not just this one.
Very quick on-site response to discuss design options, equipment locations and electrical requirements.
Price assessment: Not sure
Services: Service not listed
Response from the owner · a month ago
John, we appreciate the five-star review. We're glad our on-site response was prompt and helpful as we reviewed design options, equipment placement, and electrical requirements. Your feedback is valuable, and we look forward to working with you again.
Ed James1 reviewiTotal number of Google reviews Ed has written across all businesses on Google Maps, not just this one.
Konstantine and Paul (and one other) were excellent. Price as the best among 5 quotes. Professional. Replaced our 3.5 ton carrier gas+AC with a daikin 3.5 ton heat pump in 2 days (all to code with permits, inspectors pending).
Price assessment: Great price
Price: $2,000+
Services: Heating system installation, Install AC
Response from the owner · 2 months ago
Thank you for the 5-star review, Ed. We’re glad Konstantine, Paul, and the team provided professional service and a competitive price. It’s great to hear the Daikin heat pump was installed efficiently and to code; we will continue to coordinate with inspectors to finalize permits. Please contact us anytime if you need anything further.
