Security system supplier · New Haven, CT · reviewed since 2013
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 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.89SCORE
AGradeiLetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20.
#35 of 64 security system installersiPosition by Experts Score among all companies we track in this category. · better than 46%
4.9★★★★★423 Google reviews · 10 photos
97%five-star reviews
4.89★last 12 monthsiAverage stars on reviews from the last 12 months only.
1.9%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.
Google reviewers rate ATP Alarms 4.9 out of 5 based on 423 reviews, with the owner responding to 78 percent of comments. Customers frequently praise the company for punctual service, knowledgeable technicians, and clear communication during residential and commercial installations. They often highlight the ease of scheduling and competitive pricing compared to other providers. However, some low-star reviews criticize slow response times for service calls, billing errors, and initial installation mistakes that were not promptly corrected.
Google rating: 4.9 out of 5 from 423 reviews (97% five-star).
Reviews on this page: 423 Google reviews (369 with written comments).
Owner responses: the business replied to 78% of reviews.
Most recent review: October 14, 2026.
Service: Security System Installer serving New Haven, Connecticut.
Data from Google, last updated November 5, 2026.
Score profile vs other security system installers
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 satisfaction; weakest: replies to reviews.
ATP AlarmsSecurity System 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.ATP Alarms: 92/100 on this factor. Category median: 91.A
92
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.ATP Alarms: 87/100 on this factor. Category median: 91.A
87
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: 99.–
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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.Not enough reviews for this factor yet. Category median: 100.–
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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.ATP Alarms: 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.ATP Alarms: 78/100 on this factor. Category median: 49.B
78
Bar = this company · dark tick = category median.
Star ratings
423 Google reviews we collected
4.9of 5
5 stars41197%
4 stars31%
3 stars10%
2 stars00%
1 star82%
Praise vs complaints
Phrases our text analysis found in 369 written reviews
98%praise
Praise61898%
Complaints112%
Topic share
How often each topic comes up in the written reviews
7topics
Would recommend15925%
Staff & attitude14223%
Quality & results9615%
Speed & response9515%
Price & value599%
Communication396%
Honesty & trust396%
What customers talk about
We read 369 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“I highly recommend ATP to anyone looking for a home security company or considering to switch.”
“If anyone in Fairfield needs a new alarm install or a company to take over their current system I can't recommend ATP enough.”
“Just had my home security system installed this morning and couldn’t be more impressed by the responsiveness and professionalism from the company.”
“Same day, great service, great salespeople, great technicians, they know what they're doing, thank you so much”
“Alarm system not working to full capacity, called several times and they never call back.”
“He answered all our questions and worked quickly to address anything we had concerns about.”
“They installed a brand new system for me, quick to install, they came on time, fair price, works great, lots of sensors, the technician was great.”
“…m at my shop, Anthony who was the installer was very professional and walked us through every aspect of the new system!…”
“Honestly, this experience has been more than I could ask for.”
People customers mention
Protection33 reviews
Mineri17 reviews
Rence14 reviews
Lou14 reviews
Dillon11 reviews
Wallingford7 reviews
praise complaint · found by our text analysis, Google review wording unchanged.
Recent reviews
CChristian5 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★★★★★
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 finish, go with ATP.
MMassageLocal Guide · 15 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★★★★★
Every time I call them, they come right out. Same day, great service, great salespeople, great technicians, they know what they're doing, thank you so much
AA.Local Guide · 27 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★★★★★
Louis has provided top-notch, white glove treatment from day 1. Not only does he consider everything and know his business well, but he makes you feel like family! Their technician, Mark, is also wonderful - he didn’t just come here to install, he came with suggestions and solutions. Honestly, this experience has…
LLauren12 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★★★★★
Just had my home security system installed this morning and couldn’t be more impressed by the responsiveness and professionalism from the company. Very grateful to have found this local company after an awful experience with ADT.
LLisa2 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★★★★★
We are very happy with the installation of our new ATP alarm system! Lou is amazing and so attentive to his customers. He answered all our questions and worked quickly to address anything we had concerns about. He makes you feel like family and we are extremely happy with the service we received!
TTerry11 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 months ago★★★★★
ATP had been protecting my house for many years. They are professional, quick to respond, and I always have felt my home, and my family, had a high level of protection.
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 finish, go with ATP.
Response from the owner · 3 weeks ago
Thank you, Christian! We appreciate your trust in ATP for both your residential and commercial needs. It’s great to hear that you had a seamless experience with us.
M
Massage By DavidLocal Guide · 15 reviewsiTotal number of Google reviews Massage has written across all businesses on Google Maps, not just this one.
Every time I call them, they come right out. Same day, great service, great salespeople, great technicians, they know what they're doing, thank you so much
Response from the owner · a month ago
Thank you, David! We appreciate your kind words about our service and team. It's great to hear that you had such a positive experience!
A
A.Local Guide · 27 reviewsiTotal number of Google reviews A. has written across all businesses on Google Maps, not just this one.
Louis has provided top-notch, white glove treatment from day 1. Not only does he consider everything and know his business well, but he makes you feel like family! Their technician, Mark, is also wonderful - he didn’t just come here to install, he came with suggestions and solutions. Honestly, this experience has been more than I could ask for. Thank you Louis - my daughter will miss you!
Response from the owner · 2 months ago
Thank you for your review! We're glad to hear that Louis and Mark provided such exceptional service. We appreciate your kind words and are here for you anytime!
L
Lauren Murray12 reviewsiTotal number of Google reviews Lauren has written across all businesses on Google Maps, not just this one.
Just had my home security system installed this morning and couldn’t be more impressed by the responsiveness and professionalism from the company. Very grateful to have found this local company after an awful experience with ADT.
Response from the owner · 2 months ago
Thank you, Lauren! We truly appreciate your kind words about our team's responsiveness and professionalism. It's great to hear that you're pleased with your new home security system after your previous experience. We're here to help whenever you need us!
L
Lisa Zarcone2 reviewsiTotal number of Google reviews Lisa has written across all businesses on Google Maps, not just this one.
We are very happy with the installation of our new ATP alarm system! Lou is amazing and so attentive to his customers. He answered all our questions and worked quickly to address anything we had concerns about. He makes you feel like family and we are extremely happy with the service we received!
Response from the owner · 2 months ago
Thank you, Lisa! We're so glad to hear that you're happy with your new ATP alarm system and that Lou provided you with attentive service. Your satisfaction means a lot to us!
T
Terry Kalfus11 reviewsiTotal number of Google reviews Terry has written across all businesses on Google Maps, not just this one.
ATP had been protecting my house for many years. They are professional, quick to respond, and I always have felt my home, and my family, had a high level of protection.
Response from the owner · 3 months ago
Thank you, Terry! We're grateful for your trust in us over the years and are glad to hear you feel secure with our services. Your family's safety is our top priority.
F
Fang Zhou2 reviewsiTotal number of Google reviews Fang has written across all businesses on Google Maps, not just this one.
ATP is a great company to work with. It was a wonderful experience. The owner Rence is one of the best CEOs and has a great team. The techinicians Zeb, Zach, are professional and very knowledgeable. Requests are always handled timely and professionally.
I highly recommend ATP to anyone looking for a home security company or considering to switch.
Response from the owner · 3 months ago
Thank you, Fang! We appreciate your kind words about Rence and our technicians, Zeb and Zach. It's great to hear you had a wonderful experience with us, and we truly value your recommendation.
M
Maria Bartone2 reviewsiTotal number of Google reviews Maria has written across all businesses on Google Maps, not just this one.
Lou explains throughly and very personable. The installation went smoothly. Thanks again
Response from the owner · 3 months ago
Thank you, Maria! We're glad to hear that Lou provided thorough and personable service, and that the installation went smoothly. We appreciate your feedback!
J
James2 reviewsiTotal number of Google reviews James has written across all businesses on Google Maps, not just this one.
