The Basic Freeze Alarm will phone you if the temperature drops to dangerously low levels at its location. Shame it doesn’t also warn about frosty looks from your partner, but you can’t have it all, can ya? $99.99.
This sensor will not interfere with your existing telephone service, although it is not compatible with PBX or other multi-line business phone systems. In the event of a temperature dip, the Basic Freeze Alarm will call out to any number you program, continuing to call until the temperature rises or the alert is canceled. You can set the sensor to call every 15 minutes or every 2 hours.