70 solar installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Windsor: Sunlight Solar Clean, CR Score 91/100; 5.0★ from 484 Google reviews; open 7 days a week.
Best for emergencies (open 24/7): Solar Santa Rosa, posts 24/7 hours; ranked #2 of 70.
Most-reviewed: Ongaro & Sons, 1,222 Google reviews at 4.9★, the most of 70 ranked; ranked #4.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
70 Windsor solar installers are ranked here by CR Score, from 8 published factors. 10 are open 24/7, 29 open Saturdays and 19 open Sundays, based on posted hours. The median Google rating is 5.0★ across 70 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Sunlight Solar Clean | 91 | 5.0★ (484) | Santa Rosa, 8 mi away | Sat · Sun · Evenings | Overall |
| 2 | Solar Santa Rosa | 89 | 5.0★ (33) | Santa Rosa, 8 mi away | 24/7 | Emergencies |
| 3 | Sonoma Solar Clean | 89 | 5.0★ (157) | Santa Rosa, 6 mi away | Sat · Sun · Evenings | — |
| 4 | Ongaro & Sons | 88 | 4.9★ (1,222) | Santa Rosa, 9 mi away | 24/7 | Most reviews |
| 5 | Sunrun Solar | 87 | 4.8★ (472) | Petaluma, 22 mi away | Sat · Sun | — |
| 6 | Ongaro & Sons | 85 | 4.9★ (538) | Petaluma, 22 mi away | 24/7 | — |
| 7 | Shine On Solar & Maintenance | 84 | 5.0★ (45) | Cotati, 18 mi away | Sat · Sun | — |
| 8 | Soleil Solar | 84 | 5.0★ (15) | Sebastopol, 10 mi away | Sat · Sun | — |
| 9 | Henry Mechanical | 83 | 5.0★ (866) | Windsor | 24/7 | — |
| 10 | Sustainable Living Builders, Inc | 83 | 4.9★ (84) | Sebastopol, 13 mi away | 24/7 | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and trade focus: 5.0★ from 484 Google reviews, listed on Google as “Solar panel maintenance service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 8 mi away
Ranked #2 because of its Google rating and availability: 5.0★ from 33 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 6 mi away
Ranked #3 because of its Google rating and trade focus: 5.0★ from 157 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 9 mi away
Ranked #4 because of its Google rating and review volume: 4.9★ from 1,222 Google reviews, the most Google reviews on this list (1,222).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Petaluma, 22 mi away
Ranked #5 because of its Google rating and trade focus: 4.8★ from 472 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Petaluma, 22 mi away
Ranked #6 because of its Google rating and availability: 4.9★ from 538 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Cotati, 18 mi away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 45 Google reviews, listed on Google as “Solar panel maintenance service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sebastopol, 10 mi away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 15 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Windsor
Ranked #9 because of its Google rating and review volume: 5.0★ from 866 Google reviews, 866 Google reviews.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sebastopol, 13 mi away
Ranked #10 because of its Google rating and availability: 4.9★ from 84 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Napa, 33 mi away
Ranked #11 because of its Google rating and availability: 5.0★ from 6 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Larkfield-Wikiup, 14 mi away
Ranked #12 because of its Google rating and availability: 5.0★ from 75 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Petaluma, 16 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 40 Google reviews, listed on Google as “Solar panel maintenance service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 10 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 9 mi away
Ranked #15 because of its Google rating and trade focus: 5.0★ from 90 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 13 mi away
Ranked #16 because of its Google rating and availability: 4.7★ from 46 Google reviews, open 7 days a week.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Alameda, 37 mi away
Ranked #17 because of its Google rating and availability: 5.0★ from 5 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sonoma, 25 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 8 Google reviews, listed on Google as “Solar energy company”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Sebastopol, 10 mi away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 64 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Rohnert Park, 22 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 20 Google reviews, listed on Google as “Solar panel maintenance service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sebastopol, 11 mi away
Ranked #21 because of its Google rating and trade focus: 4.9★ from 84 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Fairfield, 32 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 30 Google reviews, listed on Google as “Solar panel maintenance service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Santa Rosa, 8 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 35 Google reviews, listed on Google as “Solar energy system service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sebastopol, 10 mi away
Ranked #24 because of its Google rating and trade focus: 4.8★ from 47 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Sonoma, 27 mi away
Ranked #25 because of its Google rating and availability: 5.0★ from 68 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 70 ranked solar installers here; the rest are on their profiles.
20 more solar installers within 40 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| All American Air & Solar System | 5.0★ (1) | 25 mi |
| Aloha Solar | 5.0★ (1) | 21 mi |
| Alta Energy | 5.0★ (1) | 8 mi |
| Bluetail Industries | 5.0★ (1) | 17 mi |
| First Response Solar | 5.0★ (1) | 10 mi |
| Golden State Solar Electric | 5.0★ (1) | 33 mi |
| Great Solar Panels | 5.0★ (1) | 23 mi |
| JBL Solar Energy | 5.0★ (1) | 16 mi |
| Prime Energy - Windsor Solar Company | 5.0★ (1) | 8 mi |
| Prime Energy Solar | 5.0★ (1) | 7 mi |
| Pura Vida Solar Company | 5.0★ (1) | 7 mi |
| Ridgeline Roofing Co | 4.8★ (85) | In Windsor |
| Santa Rosa Solar Panels | 5.0★ (1) | 10 mi |
| Smart Energy USA | 5.0★ (1) | 23 mi |
| Solar Dealers | 5.0★ (2) | 18 mi |
| Solar Sun Surfer | 5 mi | |
| Solaris Construction Inc. | 5.0★ (1) | 10 mi |
| Sphere Solar Electric | 5.0★ (1) | 5 mi |
| Thern Electric | 5.0★ (1) | 33 mi |
| You Benefit Solar | 3.0★ (2) | 24 mi |
Typical prices in USD, adjusted for California with a published regional index. Each row names its basis and month.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Solar panel installation | $29,770 | $33,680 | $36,640 | Per system: about 12 kW at about $2.60 per watt, before incentives. US national range × 1.08 Pacific factor (2025 Cost vs. Value Report) | October 2026 |
We scored 70 Windsor solar installers on 8 factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. Unknown factors are left out of the score, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Windsor data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |