Hey!
You can get an exact calculation of how much it would cost you to run it 24 hours.
This is all you have to do.
1. Check the device wattage (watts), lets say its 100watts..
2. Multiply 100w x 24 (Hours Used Per Day) = 2.400 Watt-hours (Wh) Device usage per Day.
3. Devide Device Usage 2.400 (Wh) / 1000 (Wh/kWh) = 2.4 Device Usage in kWh.
4. Multiply Daily Usage 2.4 (kWh) x 30 (Days) = 72 (kWh/Month)Approximate Monthly Usage
5. Mutiply monthly usage 72 (kWh/month) x 0.15€ (cost of electricity) = 10,80€/month
You can check your electric bill to see how much they charge you.
I have a 300W dehumidifier 24 hours and I pay roughly 30€ just for that..