X-10 devices [0] that do this have been around for a long time. I've even seen elaborate setups that can be controlled via a landline. [0]: https://thex10shop.

X-10 devices [0] that do this have been around for a long time. I've even seen elaborate setups that can be controlled via a landline. [0]: https://thex10shop.com/products/x10-powerhouse-th2807-thermostat-set-back-controller?variant=6287992422432 https://thex10shop.com/products/x10-powerhouse-th2807-thermo...