Had a bad experience with an upright freezer several months ago. Door was cracked open, and it sat that way for days. Very expensive accident.
Potential solution with Insight Switch (if it had a few more options). If freezer condenser is running, my insight switch can show me that the wattage consumption is higher that if the condenser was not running. Would love to have functionality that would be able to notify me if the switch stayed at or above a certain wattage for a specified period of time. (Just got the Wemo Maker, and maybe I can do something with the maker to help solve the constant running freezer problem)...
Could be used for other applications such as a sump pump that is running continously when it should not be, and other devices / appliances that cycle on and off.
Also would be nice to be able to track fluctuations using an IFTTT recipe.