#1
ATP Alarms
“In both Fairfield and Milford Connecticut I’ve used ATP Alarms for residential and commercial work. If you’re looking to partner up with an organization that will take care of everything you need from start to…” — Google review
Experts Reviews · 2026 Ratings
The Best Security System Installers in New Haven, CT
We graded 10 companies on seven things customers actually report: satisfaction, reliability, workmanship, value, momentum, track record and how owners handle complaints.
$132typical jobMedian of the bill customers reported in their Google review (Google asks reviewers for a price range; we use the middle of each range).
100%say the price was fairOf customers who rated the price, the share who chose “Great price” or “Reasonable” rather than “Overpriced”.
4.87★average ratingPlain average of every Google star rating we collected for these companies.
2.1%bad jobs (1–2★, 2 yrs)Share of 1–2★ reviews in the last 24 months — or the 20 newest reviews when the company had fewer than 20 in that time.
From 22,133 Google reviews of 64 top-rated security system installers nationwide; 10 of them in New Haven, CT. Updated November 5, 2026.
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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 security system installers).
| # | 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 |  Advanced CCTV Alarm SystemsNew Haven, CT | A 98How 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 69%99+68.5Reliability 31%97+29.8Experts Score= 98Not enough data for value, 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––A– | 5.00 | — |
| 2 |  Ursa Security & ControlNew Haven, CT | A 98How 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%96+25Value 15%100+15.2Craft & service penalty99−0.1Experts Score= 98Not 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– | 5.00 | — |
| 3 |  Lynx Systems LLCNew Haven, CT | 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 59%96+56.3Reliability 26%95+24.8Value 15%95+14.5Craft & service penalty99−0.1Experts Score= 95Not 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– | 4.96 | — |
| 4 | ATP AlarmsNew Haven, CT | A 89How 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 64%92+58.4Reliability 28%87+24.6Replies to reviews 8%78+6.4Experts Score= 89Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA––AB | 4.91 | — |
| 5 |  CT Security LocksmithsNew Haven, CT | A 83How 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%83+45.3Reliability 24%72+17.5Value 14%100+14.1Replies to reviews 7%84+5.9Experts Score= 83Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | ABAAAA | 4.90 | $153 |
| 6 |  Mammoth Security Inc. New BritainNew Haven, CT | A 83How 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%82+44.7Reliability 24%78+18.9Value 14%94+13.3Replies to reviews 7%91+6.4Craft & service penalty98−0.2Experts Score= 83Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | ABAAAA | 4.77 | — |
| 7 |  Automotive Specialty Systems LLCNew Haven, CT | A 82How 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 64%88+55.9Reliability 28%80+22.6Replies to reviews 8%91+7.5Momentum penalty58−4.2Experts Score= 82Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA––CA | 4.92 | — |
| 8 |  Prosegur Security USA – Shelton OfficeNew Haven, CT | A 82How 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 64%83+52.7Reliability 28%90+25.4Replies to reviews 8%79+6.5Momentum penalty69−3.1Experts Score= 82Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA––BB | 4.85 | — |
| 9 |  Property Protection Consulting LLCNew Haven, CT | B 79How 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 64%84+53.4Reliability 28%77+21.7Replies to reviews 8%83+6.8Momentum penalty72−2.8Experts Score= 79Not enough data for value; its weight is shared by the others.Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AB––BA | 4.86 | — |
| 10 |  Sterling Security Systems IncNew Haven, CT | B 72How 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 64%80+50.8Reliability 28%70+19.8Replies to reviews 8%32+2.6Momentum penalty85−1.5Experts Score= 72Not enough data for value; its weight is shared by the others.Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AB––AD | 4.74 | — |
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”. |
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Security System Installers in New Haven, CT at a glance
How the 10 security system installers we rated in New Haven, CT compare, and what customers praise most.
Experts Score grades
A = score 80+, F = below 20.
- Grade A880%
- Grade B220%
- Grade C00%
- Grade D00%
- Grade F00%
Google ratings
Average stars per company.
- 4.90★ and up660%
- 4.80–4.89★220%
- 4.60–4.79★220%
- Below 4.60★00%
What customers praise
Share of Google review highlights.
- Quality63420%
- Professionalism70923%
- Responsiveness62420%
- Punctuality57018%
- Value56018%
Was the price fair?
All price verdicts left with reviews.
- Great price28756%
- Reasonable20941%
- Overpriced20%
- Not sure163%
Price verdicts by year
Share calling it great / reasonable / overpriced.
2025
2026
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.
The 10 best-rated security system installers in New Haven, CT average 4.9★ on Google across 1,467 reviews. Lynx Systems LLC has the top rating (5.0★), and ATP Alarms has the most reviews (423). Updated November 5, 2026.
10 companies that meet our bar: rated 4.5★ or higher on Google, with a meaningful review history (1,467 reviews combined) and currently operating. Request a call back and the company will phone you directly.
#2
CT Security Locksmiths
“He’s very reliable and honest and fair with his prices , I wouldn’t recommend no one but them super professional . Got quoted 2-3 hundred dollars he came to my location and had it done within 20 mins of being at the car” — Google review
#3
Lynx Systems LLC
“Shem was fantastic! He was friendly, efficient with his work, and happy to answer all of our questions about how to run the system.” — Google review
#4
Advanced CCTV Alarm Systems
“Emmanuel did a amazing job he was so very helpful I’m in a wheelchair and he went beyond and also cut branches for me so the camera would see everything perfectly. And he also helped me open the doors and was very…” — Google review
#5
Property Protection Consulting LLC
“PPC installed our new security sustem today. Kudos to all we've interacted with to make this happen. From Nick, to Kariann to the 2 installers Frankie and Scottie who worked tirelessly to make the installation go…” — Google review
#6
Ursa Security & Control
“Knowledgeable about security systems, security cameras, and fire alarms. Plus they were very friendly and helpful to work with.” — Google review
#7
Automotive Specialty Systems LLC
“Been coming to this place for a few years now. Guys are extremely knowledgeable and go above and beyond every time. Always friendly, always polite and always willing to squeeze me or my friends in if its a safety…” — Google review
#8
Prosegur Security USA – Shelton Office
“Very Organized, Respectful, & Helpful The Staff Here Was Very Are Great to Work with Armando & Scotty Treated everyone Great made us feel at home & welcome. coming onto the office Felt cozy and was clean and comfortable” — Google review
#9
Sterling Security Systems Inc
“The Sterling team made the security system installation process simple and straightforward. The technicians are knowledgeable, professional, personable and responsive whenever needed. The service has been…” — Google review
#10
Mammoth Security Inc. New Britain
“Victor came out today to help us out with some needs with our system and he went above and beyond to make sure we got what we needed. You can tell he is top notch at his job and he was a pleasure to work with today!…” — Google review
How we pick security system installers in New Haven
We scan Google Maps for security system installer listings in and around New Haven, keep only open businesses whose main category matches the service, and require a Google rating of at least 4.5 from at least 20 reviews. Companies are ordered by a confidence-weighted score that balances rating and review volume. We do not accept payment for placement.
Frequently asked questions
Who is the highest-rated security system installer in New Haven?
Lynx Systems LLC has the highest Google rating on our New Haven list: 5.0 out of 5 from 103 reviews (as of November 5, 2026).
Which security system installer in New Haven has the most reviews?
ATP Alarms has the most Google reviews among the companies listed here: 423, with a 4.9★ average.
How are these security system installers chosen?
Only open New Haven-area businesses whose Google category matches the service, rated at least 4.5★ from at least 20 Google reviews. They are ordered by a confidence-weighted score of rating and review volume. Placement is never paid.
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