Air purifiers are good (and advised to have especially if you have allergies or asthma), they clean the dust and fur out of the air. That is an evaporation cooler though, which are not safe for chins. Are you wanting to clean the air or cool down a room?
Evaporation cooler work by adding moisture to the air, which works well for humans but not for chins since chins can't sweat and have a thick fur coat. Unless you live in a very dry climate (like the desert where the humidity is 20% or below) it just creating a moist room without lowering the air temp. If you need cooling there is no replacement for a AC unit.