The Best HVAC Contractors in Sunnyvale, CA
We graded 9 companies on seven things customers actually report: satisfaction, reliability, workmanship, value, momentum, track record and how owners handle complaints.
From 117,533 Google reviews of 113 top-rated HVAC contractors nationwide; 9 of them in Sunnyvale, CA. Updated November 1, 2026.
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Best HVAC contractors in Sunnyvale for plumbing pipe repair
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United HVAC, Plumbing & ElectricalHow Job match is calculatedBuilt only from reviews Google tagged “Plumbing pipe repair”:Stars on this job 55%4.94★Number of such jobs 25%65Overall Experts Score 20%95Job match= 94Stars are pulled toward the category average (4.90★) 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
United HVAC, Plumbing & ElectricalHow Job match is calculatedBuilt only from reviews Google tagged “Plumbing pipe repair”:Stars on this job 55%5.00★Number of such jobs 25%6Overall Experts Score 20%96Job match= 81Stars are pulled toward the category average (4.90★) 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.81Job match = this company’s ★ on reviews Google tagged “Plumbing pipe 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 plumbing pipe repair
United HVAC, Plumbing & ElectricalI had a great experience with Cristopher Villa. He did an excellent job redoing the plumbing underneath my kitchen sink and making sure everything was properly connected and working as it should. He also snaked the kitchen drain line to address a recurring blockage. Cristopher was professional, knowledgeable, and…
United HVAC, Plumbing & ElectricalUnited HVAC & Plumbing’s technicians were professional and good communicators. They came when scheduled and diagnosed our plumbing issues quickly and thoroughly. The team worked quietly, quickly, and cleanly to replace a long kitchen drain and a leaking toilet. Both repairs are working well and are improvements in…
United HVAC, Plumbing & ElectricalAnton was awesome! Friendly informative and patient. We had knocking of our water pipes after flushing some toilets that was driving us crazy and wasn’t sure if it was a water pressure issue or simply fasteners that had failed. Of course, when Anton showed up, the knocking wouldn’t happen after we flushed the…
United HVAC, Plumbing & ElectricalThe crew came and worked efficiently and thoroughly and was able to replace my water main pipe within the time they specified.
United HVAC, Plumbing & ElectricalPasha (technician) was very helpful. We had a clogged drain and were unable to clear it ourselves. He arrived and fixed the drain and was very clean and polite. Left everything as it was before he arrived. Highly recommend.
United HVAC, Plumbing & ElectricalExcellent Service, Superior Experience, knowledgeable staff, polite, completed on time including City inspection.
Overall ratings
Experts Score 0–100Experts 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 HVAC contractors).
| # | Company | ScoreExperts 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. | FactorsFactor 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. | ★Google star rating as shown on Google Maps. | Typical billMedian bill customers of this company reported in their reviews (needs 3+ priced reviews). |
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| 1 |  Promax Service GroupSunnyvale, CA | A 100How 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%100+58.7Reliability 26%99+25.8Value 15%100+15.2Experts Score= 100Not 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– | 5.00 | $1.2k |
| 2 |  Nur HVACSunnyvale, CA | A 96How 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%98+23.8Value 14%100+14.1Replies to reviews 7%81+5.7Experts Score= 96Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAA | 4.95 | $1.1k |
| 3 | United HVAC, Plumbing & ElectricalSunnyvale, CA | A 96How 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%98+57.5Reliability 26%97+25.3Value 15%90+13.7Craft & service penalty99−0.1Experts Score= 96Not 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. | AAAAA– | 4.98 | $549 |
| 4 |  Your Appliance, Refrigeration & HVAC repairSunnyvale, CA | A 96How 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%99+24Value 14%95+13.4Replies to reviews 7%85+6Experts Score= 96Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA–AAA | 4.96 | $287 |
| 5 | United HVAC, Plumbing & ElectricalSunnyvale, CA | A 95How 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%94+51.3Reliability 24%95+23Value 14%100+14.1Replies to reviews 7%100+7.1Craft & service penalty98−0.2Experts Score= 95Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAA | 4.94 | $824 |
| 6 |  Made Simple Heating And AirSunnyvale, CA | A 95How 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%94+51.3Reliability 24%93+22.5Value 14%100+14.1Replies to reviews 7%100+7.1Craft & service penalty99−0.1Experts Score= 95Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAA | 4.95 | $1.2k |
| 7 |  United HVAC, Plumbing & ElectricalSunnyvale, CA | A 88How 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%89+21.6Value 14%81+11.5Replies to reviews 7%84+5.9Experts Score= 88Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA–AAA | 4.90 | $460 |
| 8 |  All HVAC & General ConstructionSunnyvale, CA | B 71How 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%78+42.5Reliability 24%59+14.3Value 14%100+14.1Replies to reviews 7%92+6.5Craft & service penalty35−6.5Experts Score= 71Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | BCDAAA | 4.75 | — |
| 9 |  Same Day Air Conditioning & HeatingSunnyvale, CA | B 63How 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%72+39.3Reliability 24%65+15.8Value 14%87+12.3Replies to reviews 7%22+1.6Craft & service penalty46−5.4Experts Score= 63Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | BBCAAD | 4.71 | $135 |
What jobs cost
What customers paid, from the price Google asks reviewers to report.
| Job | Low25th percentile: 1 in 4 customers paid less than this. | TypicalMedian of the bill customers reported in their Google review (Google asks reviewers for a price range; we use the middle of each range). | High75th percentile: 1 in 4 customers paid more than this. | FairOf customers who rated the price, the share who chose “Great price” or “Reasonable” rather than “Overpriced”. |
|---|---|---|---|---|
| HVAC system maintenance | $37 | $135 | $295 | 98% |
| A/C system maintenance | $39 | $192 | $393 | 98% |
| HVAC system repair | $205 | $406 | $959 | 96% |
| A/C system repair | $216 | $383 | $807 | 97% |
| Install AC | $1.6k | $2.1k | $3.2k | 98% |
| Heating system maintenance | $39 | $124 | $251 | 98% |
| Heating system installation | $1.4k | $1.9k | $2.8k | 98% |
| Repair HVAC | $224 | $359 | $535 | 96% |
| Heating system repair | $161 | $453 | $1.2k | 97% |
| Installation | $1.1k | $2.1k | $2.8k | 99% |
| Install thermostat | $50 | $148 | $437 | 98% |
| HVAC duct & vent installation | $1.2k | $1.9k | $2.8k | 95% |
HVAC Contractors in Sunnyvale, CA at a glance
How the 9 HVAC contractors we rated in Sunnyvale, CA compare, and what customers praise most.
Experts Score grades
A = score 80+, F = below 20.
- Grade A778%
- Grade B222%
- Grade C00%
- Grade D00%
- Grade F00%
Google ratings
Average stars per company.
- 4.90★ and up778%
- 4.80–4.89★00%
- 4.60–4.79★222%
- Below 4.60★00%
What customers praise
Share of Google review highlights.
- Quality22,37820%
- Professionalism27,63324%
- Responsiveness23,45921%
- Punctuality23,09820%
- Value16,77115%
Was the price fair?
All price verdicts left with reviews.
- Great price6,30133%
- Reasonable10,64856%
- Overpriced5893%
- Not sure1,4898%
Price verdicts by year
Share calling it great / reasonable / overpriced.
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.