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Pros / ADT offers a variety of professionally installed, state-of-the-art security devices.

Cons / Upgrades and add-ons can increase the monitoring fee.

 Verdict / ADT is a good choice for a comprehensive, whole-house security system, but you must meet with a company representative for a consultation.

ADT is the largest security company in the United States. In fact, it is common for other home security monitoring companies to compare themselves directly with ADT because of its dominance in the market. You can choose from a variety of fine-quality security devices, and there are six monitoring stations across the country. You also must have a technician come to your home for a consultation before you can sign up.

There are a few things in ADT's contract and fee structure worth noting. The company offers an industry-standard three-year contract. If you choose to cancel this contract early, you only have to pay 75 percent of what you still owe for monitoring services. While this is still a large amount, your contractual obligation is much higher with most other home security monitoring companies, which typically charge anywhere from 80 percent (Frontpoint) to 100 percent (Protect America) upon early cancellation. Furthermore, few companies offer better early cancellation terms. ADT is one of few home security companies that publishes a full copy of its contract online for prospective customers to view before purchase.

You have six months from the start of your contract to cancel your ADT service without penalty if the system fails to meet your expectations. Not only is this guarantee longer than those of most home security companies, but ADT returns the monitoring fees charged to your account during that time. If you want a no-contract option with ADT, you can get the ADT Home Security Starter Kit made by Samsung SmartThings.

Few companies offer so complete an equipment return policy as ADT does. The company does not offer any set equipment package, electing instead to send a technician to your home to make sure you get a personalized system. As such, ADT's monitoring and equipment prices on our site, while competitive, aren't as accurate as those from other companies.

ADT offers three monitoring plans that have varying levels of equipment and service: Traditional, Control and Video. If you want to use existing home security equipment in your home, ADT offers takeover monitoring, which cuts costs due to reduced or non-existent equipment prices. ADT also offers a full suite of business security systems.

With the ADT Pulse phone app, you can program and remotely monitor all your devices. The app also works with third-party smart home devices from Nest, Amazon Alexa and Kwikset, as well as Z-Wave devices.

When you sign up for a new ADT system, a technician comes to your home to identify vulnerable areas and discuss your security goals. The technician then recommends a set of devices to fit your needs. The system covers home-intrusion protection and fire safety, and you can also choose medical and environmental devices.

This home security monitoring company offers 24/7 customer support by phone, email, live chat and social media. If any of your devices malfunction and need repairs, you can set up an appointment with a repair technician. As with most security companies, your ADT system comes with an optional maintenance plan. The plan costs extra monthly, but if your system needs repairs, you get a discount on the cost of the technician’s visit. Regardless of how you pay for the service call, ADT offers a lifetime warranty on its equipment for as long as you're a subscriber.