Negative pressure fans are divided into models. The power consumption is generally between 500W and 1KW per hour. Environmentally friendly air conditioners are generally around 1KW. If you want to save power, it depends on the specific model. In terms of effectiveness, negative pressure fans generally need to be used together with cooling water curtains to achieve ventilation and cooling effects, while environmentally friendly air conditioners can be used directly. It works great! !