We have a freezer in
We have a freezer in the basement that was randomly warming and we lost a lot of food. Got a temperature sensor and now we can monitor it and take action if there is a problem (it involves turning it off and back on). Used the rest of the sensors we bought to monitor temperature and humidity in each of our home's rooms - we have several heat pump zones rather than central heat. The sensors have done a great job for us and the monitoring tools cover what we need.