The Right Security System.

The Right Solution.

Mercury Security, LLC is a security system supplier and installer in Connecticut (CT).  Our areas of expertise include, surveillance systems, access control, intrusion, intercom systems, and custom design/build security solutions.


Surveillance Systems

Protect your facility and staff with our State of the Art CCTV Systems.

Security Systems that meet your needs. Click here to learn more

Access Control Systems



Intercom Systems

We offer Intercom Systems for every Facility.

Click here to learn more.

8 Hour Response Time

  • Camera Repair

  • Access Control Issues

  • Surveillance Questions

24 Hour On-Site Response

  • Certified Technicians

  • Easy Scheduling

  • Quick Response

Need Service Now?

Call our Service Line: 203.378.9008

2 Hour Remote  Response

  • Remote login to your System

  • Certified Technicians

  • Software Updates

Custom Design/Build

“Sacred Heart University has been working with the Mercury Group Company for several years. We have an excellent working relationship with the Security System Manger Lou Kresmery and his technicians. His staff members are always available to answer any questions. The Mercury Group staff members are always professional, helpful and responsive. I have been in the security industry for over 20 years and this company has outperformed all other surveillance companies.”

Sacred Heart University

“Mercury Security has partnered with our district to assure that we transitioned our antiquated camera system to the best state of the art system that our budget would allow, keeping in mind future technologies and changes. They have been outstanding communicators and have always been flexible in their scheduling to meet our needs. Our districts expectations from Mercury Security has been exceeded and their technicians  have been a true pleasure to work with.”

Wolcott Public Schools

“I’ve been working with Mercury Security since our original system was installed over 10 years ago and am very happy with the service. Mercury is very easy to work with, they explain things so you understand them and are always there in a pinch. Excellent customer service and response time from the company. If I have a problem, that I cannot resolve myself, I just call Mercury Security and they are right on top of things, 95% of the time they’re out the same day.”

Iroquois Gas

“Philips has been doing business with Mercury Security for our security system in our Stamford office for over five years, and we are very satisfied with their services.”