It is not an alternative to air conditioning. The air is not cooled. The temperature does not drop in the room. I have the Dyson AM09 Hot Cool. It's similar to the Dyson Pure Hot+Cool but without the air filter. In the summer, I put it directly in front of the open window early in the morning when the temperature is below 20 degrees. At the temperatures we have at the moment, that doesn't help either. If you want cool, you have to buy an air conditioner.