A Bonaire Evaporative Cooler cost approximately an hourly running cost of $0.30*, compared to a Ducted refrigerated air conditioner with an approximate hourly running cost of $3.00* *Source – Mark Intell Report prepared for One Big Switch, July 2016 **Source: SA Summer Cooling Guide 2020-2021. Based on a conditioned area of 125m2 for ducted evaporative and ducted refrigeration and 75m2 for split system air conditioner. ***Sustainability Victoria. Calculate Cooling Running Costs. Medium House 160sqm. July 2021