There's a cool and high-tech product of
Temperaturealert.com that everyone would love to have in their house. This product will sends out email alarms if the ambient air temperature falls below or climbs above the range you set. It’s called
room temperature sensor.
The primary use of the sensor is to alert a network administrator if the air conditioner in a server room as failed. This
room temperature sensor has a real time temperature alert, pre-calibrated sensor, run as a windows service, there’s no batteties or AC required and it has 1 year free upgrades or support.