Going on threads showing hacks of other contact sensors such as:
[Updated with a warning] Hack a Samsung SmartThings Multi Sensor V5
I put together the following components in order to get a notification of when my chest freezer has exceeded 15F which is far above the setting range I see of roughly -5F to +5F.
Xfinity XHS2-UE contact & temp sensor (selected for price and battery life from Ebay) Auto paired as a Generic Zigbee Moisture Sensor, had to force it to Generic Zigbee Contact Sensor
Senasys 2570L430-2204 - Opens @ 15F Closes @ 5F
More switch format and temp setpoint options:
http://senasys.com/product-category/epoxy-sealed-temperature-switches/three-quarter-inch-thermostat-switch/2570-open-on-rise
Their sensors are rock solid reliable and affordable, their shipping often costs more!
The soldering job was tricky and not pretty but good enough. I just used the long wires that came on the Senasys model I ordered. Should have spliced in thinner wires but this worked out with care taken and I will glue/seal with some E6000 from the exterior for good measure even tho the fit was tight.
First pic is the XHS2-UE which will hang on the adjacent wall providing ambient temp info (puposely did not want to put it and its' battery in the freezer). Second pic is the Senasys temp switch on the edge of the freezer. It is just suspended in the freezer by the wires draped over the edge (wires spread so as not to cause a large gap in the lid seal).
