Based on the calculation method above, we notice that there’re only a handful of home appliances that fall into the 10% category. Yet the total monthly energy that they consume is around 80% or even more!
Indeed, we can save more than 10% of energy usage in total rather easily by focusing on reducing energy usage on these appliances. More so if we optimize the energy usage at the same time.
For instance, by reducing the air-conditioner operation from 8 hours per day to 6 hours per day due to lunch hours or breaks, we can reduce a quarter of the energy usage, i.e.
Air-Conditioner Energy Saving = (8-6) h /8 h x 41.1% = 10.3%
We can save even more by setting the temperature to 1ºC higher at the same time. It’s amazing that by focusing on air-conditioner alone, we’ve achieved more than 10% of energy saving! Want to save more? How about replacing the air-conditioner with a powerful fan (90W)?
Fan Energy Usage = (0.09 kW x 8 h x 30 ) / 450 kWh x 100% = 4.8%
Energy Saving by Using Fan = 41.1% – 4.8% = 36.3%
It’s a whopping 36.3% of energy saving for a month and every month thereafter! In reality, we can’t really replace air-conditioner entirely with fan even though we can save like crazy. That will defeat the purpose of having air-conditioner in the first place. However, it gives us a very good idea on how we can save energy substantially by using fan as a substitute where applicable.
Do the same exercise for the remaining appliances in this category. We should be able to save around 20% of energy without too much trouble.