I have installed this in early Feb. Prior to installation the weather was good and cloudy and not hot. For for about a month we don't use air-conditioning in living room during day and night time. My latest electricity bill is about RM500.

Prior to this, we turn on the air conditioning during the day in living room. The master bedroom air-conditioning is on during sleep time. The no change. The kids' rooms do not use much air-conditioning. That cost us about RM750 a month. If we use all air-conditioning for all units that will be about RM950.

So my preliminary answer is I save about RM200 a month and can be in my living room comfortably even during this hot CNY period without using air conditioning