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Top-Rated Home security system pros in Greenwich - Updated Nov 2026

Avatar for Protect Your Home
Protect Your Home
2.6(
6
)
Alarm or Security System - InstallAlarm or Security System - Monitor

Serving Greenwich, CT and surrounding areas

Approved (Corporate)

In business since 1998

Free estimates

Credit card accepted

Protect Your Home is a leader in the home security industry, providing safety and peace of mind to more than 1.5 million families nationwide. Since we emerged in 1998, we've grown from a company of few to having over 2,000 high performance team members, three locations in Indianapolis, a sales center in Kentucky, and over 128 field branches across the country—and we're still growing. \n \nFor nearly 20 years, Protect Your Home has partnered with ADT®, the #1 name in home security. Today, with our national reach, we are one of ADT's biggest partners and the only partner to be designated as an Authorized Premier Provider. \n \nOur commitment to serving others combined with our projects, events, and culture contribute to the development of our team professionally, personally, and financially. \n \nIt's our mission. It's who we are. It's our legacy. \n

SA and Homeowner
Recommended by100%of homeowners
Avatar for Mario's Electrical Technologies LLC
Mario's Electrical Technologies LLC
5.0(
3
)
Smart Home System - Install or Service

Serving Greenwich, CT and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's custom needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job. \n

Panel Upgrade(400 Amp)
Panel Upgrade(400 Amp)
Panel Upgrade(400 Amp)
Panel Upgrade(400 Amp)
Panel Upgrade(400 Amp)

+3

47 neighbors recently requested a quote
Avatar for 1st Security USA
1st Security USA
4.6(
362
)
Alarm or Security System - InstallAlarm or Security System - Install - For BusinessAlarm or Security System - Monitor+7 more

Serving Greenwich, CT and surrounding areas

In business since 2002

Free estimates

Emergency services offered

"Jeremy came out to my house to explain 1st Security's system (co-branded system with alarm.com), and gave me an amazingly good deal with the best pricing possible. The thing that amazed me was that 1st Security's pricing (both upfront equipment cost and the monthly monitoring charge, with full access to smart phone system) was LESS than the do-it-yourself options like FrontPoint. Yes--it was less than FrontPoint, even though 1st Security's pricing includes FULL installation by a professional (Larry, who was amazing--spent hours at my house making sure everything was right and teaching my husband and me how to use the system). Even more amazingly, 1st Security's monthly rate (again, less than FrontPoint) includes service, meaning that there is NO house-call charge, the way there was with my previous alarm company. If anything breaks, etc., they will come out and fix/replace it! Jeremy and Larry were both awesome--helpful, courteous, professional, prompt, etc. I highly HIGHLY recommend them and 1st Security. If you're thinking of going with a DIY alarm company to save money, don't bother--call 1st Security. They will also match other companies' prices!"
Recommended by94%of homeowners
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Home Security Systems FAQs, answered by experts

If you want to make more home security upgrades to your perimeter, consider installing a smart automatic gate opener and a security camera. These will allow you to see who’s at the gate and open it for them (or not). You can learn how to install an automatic gate opener yourself or hire a professional for a little extra.

Home security cameras typically do not record continuously 24/7. Most options use motion detection technology to trigger recording when they sense movement or a significant change in their field of view. This approach conserves storage space and reduces the need for constant monitoring. When motion is detected, the camera starts recording and may send alerts to the homeowner. However some cameras offer the option for continuous recording, but this requires substantial storage capacity and may overwrite older footage when space runs out.

It depends on your specific needs. A security system typically includes alarms, sensors for windows and doors , and 24/7 monitoring services, offering comprehensive protection with immediate response to potential threats. Cameras, on the other hand, primarily provide visual surveillance and evidence collection. A security system is preferable if your primary concern is deterring intruders and receiving real-time alerts. Cameras are ideal for monitoring and recording activities but might offer a different level of active protection. In many cases, a combination of both—a security system with integrated cameras—provides the most robust home security solution, offering prevention and documentation.

Changing the alarm in your wireless security system is a perfectly reasonable DIY task that most people can complete on their own. Simply open the system’s control panel, remove the existing battery, and replace it with a new one. If you’re using a wired system, this may require disconnecting and reconnecting both the positive and negative wires attached to the battery, and you may want to call in a professional to help. 

Each has its use, depending on the scenario. Security doors are primarily intended to keep people out of the home, while storm doors are used to protect the home from extreme weather. Both tend to be made from heavy-duty metal and may include glass panels to allow light to enter the home. Storm doors can feature mesh screens, just like screen doors, to allow for increased ventilation and to keep out pests. Security doors rarely, if ever, have mesh screens.

The Greenwich, CT homeowners’ guide to home security system services

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