Home & Business Alarm Systems Temecula Valley

Temecula Valley’s Trusted Home & Business Alarm Systems

Founded in 1971. Serving the Temecula Valley since 1985. A-Bell Alarms is a second-generation, family-owned alarm company providing home and business alarm systems in Temecula, Murrieta, Menifee, Wildomar, and Southwest Riverside County. We handle custom installation, 24/7 professional monitoring, and service for existing Honeywell and Ademco systems. Chris Sizemore personally handles every installation and service call.

Temecula Valley home and business alarm systems - A-Bell Alarms
Resideo ProSeries alarm systems installed by A-Bell Alarms in Temecula Valley

Business & Home Security Systems & Solutions

Alarm System Installation & Monitoring for Homes and Businesses

A-Bell Alarms has been protecting homes and businesses in the Temecula Valley for over 55 years. We are a Resideo Pro and First Alert Pro Premier Partner, which means every system we install uses the Resideo ProSeries platform — the same technology trusted by security professionals nationwide.

We are not a call center. When you call A-Bell, you reach Chris or Kathy Sizemore directly. When a technician shows up at your door, it’s Chris. That’s the difference between a local alarm company and a national chain

Why Homeowners and Business Owners Choose A-Bell

  • Custom-designed alarm systems — not a one-size-fits-all kit off a shelf. Every system is designed for your property, your routine, and your priorities.
  • 24/7 central station monitoring through Alarm Watch, with immediate dispatch for intrusion, fire, carbon monoxide, and environmental alerts.
  • Honeywell and Ademco alarm service — we are one of the few companies that still services legacy Ademco and Honeywell VISTA and LYNX systems. If you have an older system that another company won’t touch, call us.
  • Monitored smoke detectors and fire detection — if your homeowner’s insurance is requiring monitored fire detection due to California fire zone map changes, we can help you stay compliant and keep your coverage.
  • Smart home automation — locks, garage doors, lighting, and thermostats controlled through the Total Connect app on your phone.
  • Alarm system takeovers — switching from ADT, Brinks, Vivint, or another provider? We can often use your existing equipment and move your monitoring to local, personal service.

Business Alarm Systems

Protect your company’s most important assets

Custom commercial alarm systems for Temecula Valley businesses.

Intrusion detection, 24/7 monitoring, video verification, and remote access through Total Connect. From a single storefront to a multi-location operation, we design systems that fit the way your business runs.

Home Alarm Systems

Secure Your Home and Protect What Matters Most

Protect your family with a home alarm system designed for the way you actually live.

Intrusion detection, monitored smoke and carbon monoxide detectors, security cameras, video doorbells, and smart home automation — all managed from the Total Connect app on your phone.

Service Your Existing Honeywell or Ademco Alarm

Have an existing security system?

Upgrade Your Security Service with A-Bell Alarms

Have a Honeywell or Ademco alarm system that needs service, repair, or new monitoring? A-Bell specializes in legacy alarm systems that other companies won’t touch. We can also take over monitoring from your current provider — often using your existing equipment.

Frequently Asked Questions About A-Bell Alarms

A-Bell Alarms serves Southwest Riverside County, including Temecula, Murrieta, Menifee, Lake Elsinore, Wildomar, Canyon Lake, French Valley, and Winchester. We install and service home and business alarm systems throughout the Temecula Valley.

California requires an Alarm Company Operator license from the Bureau of Security and Investigative Services to legally install, service, or monitor alarm systems. A contractor installing alarm systems also needs a CSLB license with the appropriate classifications. You can verify any company's license at bsis.ca.gov and cslb.ca.gov. A-Bell Alarms holds ACO License #3875 and CSLB Contractor License #651728 with C-7 Low Voltage Systems and C-10 Electrical classifications. If a company cannot provide an ACO license number, they are not legally authorized to install or monitor alarm systems in California.

Yes. A-Bell Alarms specializes in servicing and monitoring existing Honeywell and Ademco alarm systems, including the VISTA and LYNX series. We can repair components, upgrade your monitoring, and extend the life of your current system. We are one of the few companies that still services legacy Ademco equipment.

Yes. A-Bell Alarms handles alarm system takeovers and monitoring conversions. In many cases, we can use your existing Honeywell or Ademco equipment and switch your monitoring to local, personalized service. You get 24/7 central station monitoring through Alarm Watch with the benefit of dealing directly with a local, family-owned alarm company.

Yes. If your homeowner’s insurance is requiring monitored fire detection due to California fire zone map changes, A-Bell Alarms can install professionally monitored smoke detectors connected to 24/7 central station monitoring. This meets the insurance requirement for monitored fire detection and helps you keep your coverage. Call (951) 302-3100 to schedule an assessment.

Many homeowner's insurance companies offer a discount for homes with professionally monitored alarm systems, and some insurers in California fire zone areas now require monitored fire detection as a condition of coverage. A-Bell Alarms installs professionally monitored smoke detectors connected to 24/7 central station monitoring that meet these insurance requirements. After installation, we provide the monitoring certificate your insurance company needs to apply the discount or confirm compliance. Call (951) 302-3100 to find out what your insurer requires and how we can help.

A-Bell Alarms is a second-generation, family-owned alarm company founded in 1971 by Gene Sizemore. Today it is owned and operated by Chris and Kathy Sizemore, who have served the Temecula Valley since 1985. Chris personally handles every alarm system installation and service call. A-Bell is a Resideo Pro and First Alert Pro Premier Partner, a 2021 Temecula Valley Business of the Year, and holds a BBB A+ rating.

Temecula Valley’s First Alert Pro

Chris and Kathy Sizemore, owners of A-Bell Alarms — Temecula Valley's home and business alarm systems experts

Kathy and Chris Sizemore — Temecula Valley’s “Dynamic Duo of Security”

Temecula Valley’s

First Alert Pro

A-Bell Alarms is a First Alert Pro Resideo Premier Partner serving Temecula, Murrieta, Menifee, Wildomar, Lake Elsinore, Canyon Lake, French Valley, and Winchester. That certification means every system we install meets the highest standards in the residential and commercial alarm industry. You’re not working with a subcontractor or a rotating crew. Chris and Kathy Sizemore are the owners, and Chris personally handles every installation and service call in Southwest Riverside County.

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Tina Gottlieb profile picture
Tina Gottlieb
2024-11-20
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I've been a happy customer since 2020. A-Bell alarm made sure we had a system that met our needs and was very professional and personalized. I am so pleased with the service.
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Melissa Reid profile picture
Melissa Reid
2024-07-30
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I highly recommend A-Bell Alarms. When I was shopping for a home security system a couple of years ago, they were by far the most knowledgeable, best priced, and easy to talk to. Chris is honest and doesn’t try to upsell you (he was able to integrate some of the security sensors installed by the previous home owner into our new security system). In the past 2 years, we’ve had no issues with any of the equipment, aside from a sensitivity setting on one of the sensors, and Chris was very quick to come by and make an adjustment to the settings even though it was very close to the Christmas holiday. They always return calls quickly and are happy to answer any questions you may have.
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Laura Lee profile picture
Laura Lee
2024-07-26
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I’ve been using this service for awhile. Chris is responsive, helpful, professional, and kind. The monitoring is very quick. Highly recommended.
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Brooke Nunn
2024-07-05
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The Temecula Chamber is a customer and we are incredibly impressed by A-Bell Alarms Company! The quality of their products, their extensive knowledge, competitive prices, and genuine care for their customers set them apart. Chris and Kathy have been in the security business for many years, and their expertise shines through in the excellent guidance they provide on selecting the right security features for a business. We are so grateful to have such a dedicated and professional business in our town. Highly recommend A-Bell Alarms for all your security needs!
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Jim Sappington
2024-06-25
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The Temecula Valley Historical Society uses A-Bell Alarms for both our museum and store. Chris and Kathy operate a quality business with a proven and extensive history here in the Temecula Valley. We are more than satisfied with their service, integrity, and professionalism and would recommend A-Bell for any security needs.
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Loy Miller profile picture
Loy Miller
2023-08-04
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I have had A-Bell Alarms for my residence for more than 10 years. They have always been responsive and professional. The personalized service they provide is great. Good Job!
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Rico Suave profile picture
Rico Suave
2021-11-23
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Chris called me back shortly after leaving him a voice mail. He helped me setup an existing but unused system in the house and I was able to get up and running in a very short period of time with a minimal cost. Would highly recommend to anyone interested in good customer service. Chris was punctual, helpful and I got exactly what I was looking for.
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Jennifer Nelson profile picture
Jennifer Nelson
2020-10-15
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We have been using A-Bell alarms to secure our medical practice for many years. They are an extremely professional, attentive, responsive, local company. Just recently their high quality sensor alerted us to water dripping in the early stages of a water heater leak saving us from a massive flood and saving us from a huge expense. I would recommend A-Bell alarms to any business or residential customer. We are so happy with their service and will be their customer for many years to come.
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Jon Gerke profile picture
Jon Gerke
2020-09-11
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I am so pleased and overly satisfied with the service A-Bell alarms has given us. They're professional and reliable, always willing to fix a problem. I've been with them ever since I opened my business in 1998. Great service and great communication!
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Heather Lewis profile picture
Heather Lewis
2020-08-18
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Both of our family businesses have been using A-bell alarms for our security monitoring for many years. They are very knowledgeable about what they do and always respond quickly when we need help. I highly recommend them!

Secure Your Peace of Mind with A-Bell Alarms

Over 55 years of protecting families and businesses in the Temecula Valley. Call us or schedule a free consultation.

Ready to experience the A-Bell Alarms difference?