Or via your smart thermostat. https://sense.com/consumer-blog/with-your-permission-utilities-can-control-your-smart-thermostat-to-reduce-energy-usage/ https://

Or via your smart thermostat. https://sense.com/consumer-blog/with-your-permission-utilities-can-control-your-smart-thermostat-to-reduce-energy-usage/ https://sense.com/consumer-blog/with-your-permission-utiliti... (Morse code messages via your flickering lights would be a hilarious app, and I'm somewhat reluctant to mention it here before someone gets VC funding to actually try it.)