Surely this can be circumvented by, say, lighting a candle next to the thermostat, or any other small heat source?
For every convenience, there is inevitably a compromise.
"Mounts on the wall under your thermostat and plugs into an appliance or wall receptacle module. Selector switch (low, medium, and high) 'fools' your thermostat into 'thinking' the room is 5, 10, or 15 degrees F warmer than it really is."
[1] https://thex10shop.com/products/x10-powerhouse-th2807-thermo...