Hi @MFYVC,
Welcome to the Dyson Community!
The Dyson Hot+Cool fan heater uses a maximum of 1500w, when set to heat mode, highest airflow, and set to oscillate. The exact running cost will depend on a variety of factors including the initial ambient temperature in the room, the target temperature you’ve chosen and the size of room you’re trying to heat - as well as the current electricity tariff provided by your supplier.
But it’s engineered to project heated air effectively to warm the room evenly, rather than creating a localised zone of warmer air around the machine itself. And the intelligent thermostat lets you set the target temperature to the degree and then maintain this - so the machine only runs when it needs to.
Hope this information is useful!