Freeze Sensors for Vacant and Winter Homes: Options, Cost

Which security systems offer freeze or temperature sensors?

The four systems covered here all sell a sensor that can warn about cold, but they work differently. Published specs and prices as of October 1, 2026:

Two practical differences matter for a vacant home. First, fixed versus custom thresholds: SimpliSafe's 41°F and Ring's 40°F are set close to freezing, so the margin between the alert and frozen pipes is small once the heat fails. ADT's sensor is configurable. Second, the ADT sensor reports temperature roughly every 15 minutes according to its support article, so expect a short lag.

Ring's newest model combines water and freeze in one $24.99 device, which is the cheapest way here to cover both risks at one spot. If you want leak coverage too, the trade-offs are in our guide to water leak sensors on a security system.

Does monitoring send help when the temperature drops?

No. Like leak alarms, cold alarms get a phone call, not a dispatch, at the two brands that publish their response plans:

• SimpliSafe treats water and temperature as Environmental alarms: Primary Contacts get an automated voice message, then Secondary Contacts. Its support page says environmental alarms do not result in dispatch whether or not you answer.
• Ring lets you switch on automated calls for low temperature on the Flood & Freeze Sensor with a compatible Ring subscription. The monitoring center calls your primary contact, then your second emergency contact. Ring's response-plan page says the sensor does not offer dispatch services.

That is the core design problem for a winter or vacant home. The alert reaches a phone, possibly hundreds of miles away. Someone still has to drive over, find out why the heat failed and turn off the water if a pipe has already split. Before you buy, name that person and put them on the contact list ahead of yourself if they live closer.

The guidance on the other side of the equation is simple. The American Red Cross says that if you will be away during cold weather, leave the heat on, set no lower than 55°F. Its list of the pipes most exposed to freezing includes pipes in unheated interior areas such as basements, crawl spaces, attics, garages and kitchen cabinets, and pipes running along exterior walls with little or no insulation. Those are the spots for a freeze sensor.

What happens to freeze alerts in a power or internet outage?

This is the weak point. In a vacant house the most likely cause of a heating failure in a storm is a power cut, and that is also what can silence the alerting chain. What each maker publishes:

• SimpliSafe describes its base station as Wi-Fi connected, with built-in network backup and up to a 24-hour battery that takes over if power goes out.
• Ring Alarm Base Station (2nd gen) has a built-in backup battery for up to 24 hours. Alarm Cellular Backup, which keeps the system connected when home internet drops, comes with a Ring subscription.
• Ring's Sidewalk sensors need Amazon Sidewalk coverage. Ring says many eligible Echo and Ring devices help extend and strengthen that network, and that coverage may vary by location.

So a long outage can outlast the backup battery, and the alert you most need may arrive late or not at all. Two mitigations: pick a system with cellular backup, and treat a "device offline" or "power lost" notification from a vacant home as seriously as a cold alarm. Our guide to home security during a power outage covers backup batteries and connectivity in more depth.

How to set up freeze protection in an empty house

A setup that matches the published specs:

1. Heat on, at or above 55°F, per the Red Cross. The sensor is a backstop, not a substitute.
2. One sensor near the thermostat, a placement SimpliSafe names on its sensor page, and one at the coldest plumbing: a crawl space, an unheated basement, or the cabinet under a sink on an exterior wall.
3. A leak sensor at the water heater and main supply, so you hear about a split pipe as well as the cold that caused it.
4. A local contact first on the call list. Monitoring calls are automated and do not dispatch anyone.
5. Shut off and drain the water for long absences if you can. A dry pipe cannot burst.

Landlords with empty units face the same problem with more doors to cover; see landlord and vacant property security. For the full picture of protecting a second home, start with vacation home security monitoring. Freeze and leak sensors are sensors like any other in the system; our door and window sensor comparison covers the battery and connectivity basics they share.

If you are adding professional monitoring to a seasonal or vacant home, our short questionnaire at /quote fetches quotes from professional monitoring providers. Ask each whether temperature alarms are included, what the trigger point is, and whether a person or an automated system makes the call.