ADT carries a lower price point than Xfinity in both upfront costs and installation. The cheapest ADT  security equipment options are listed at $99 for equipment and $35.99/mo. for professional monitoring. On the other hand, Xfinity charges $360 for its basic kit and $39.95/mo. for monitoring – more than ADT home security overall. 

Although Xfinity charges more for its services, one advantage to this price is that it doesn’t require a long-term contract if you pay for your equipment upfront. If you choose the finance the equipment, you’ll have to enter into a 24-month contract. On the other hand, ADT requires a 36-month contract. 

All ADT services come with a 6-month money-back guarantee, an industry-leading trial period that covers you if there’s an unresolved system issue. Xfinity’s Customer Commitment honors a shorter 30-day trial on home services.

ADT offers a free in-home consultation for a security expert to help you pick a package and equipment to meet your home security needs. Xfinity also operates hundreds of storefronts in the United States, giving you the opportunity to check out their smart home lineup in-person or schedule an Xfinity whole-home assessment.

ADT and Xfinity both offer basic home security equipment including sensors, cameras and control panels. They also offer thermostats and smoke detectors. But ADT offers a few additional smart home security devices including smart lights, video doorbells, and garage openers as add-ons. Some of these devices are available for Xfinity, but only through compatible third-party providers.

Both ADT and Xfinity require professional installation for their home security systems. Installation fees are not included in the cost of equipment or monitoring.