Our mini-split heat pumps at home and on Welch use wireless thermostats that use Honeywell Red Link technology. The in home internet gateway is a Honeywell product logged into a Honeywell server. You can control the thermostats from a PC or mobile phone.
As Denis noted you can set email notifications for loss of connection. There is an ambiguity as the loss could be only the internet being down (but the heat is still on) or it could be a power outage. You can also set notifications based on temperature being either above or below selected points.
For a residence that depends on heat that is left vacant for periods of time in the winter I would either 1. have the wireless system plus a separate low temp phone alert or 2. winterize and shut down.
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