2025-06-04 00:00:00 The Tenki-HVAC Smart App allows you to control all Tenki IoT devices from your smartphone. Those who own a Netsu Wall-WiFi chronothermostat can turn on, turn off and program the heating or underfloor cooling system in its entirety. Those who have also purchased a Wireless WiFi Relay Switch can manage it directly from the App, programming smart on and off actions.