Room dehumidifiers consume electrical energy according to their capacity. For example: Desidrat’s best-selling equipment, Plus 150, with capacity to accommodate rooms of up to 150 m³/50 m², consumes about 200 watts, the same as a light bulb. This is a fairly low consumption given the benefits it provides.
The main saving tip is to always keep the room closed, so that it is dehumidified as soon as possible and the equipment enter standby mode, while only the ventilation system remain active. If doors and windows are left open, the device will operate and remove water from the air, but it will not solve the problem.
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