Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Definitely makes a difference

I purchased the fan to use in a second floor bedroom window, to try to beat the heat of the hot nights of an inland Orange County, CA summer (without turning on the AC). I have definitely noticed a significant difference in the room temperature after the fan has been running for a while, once the outside temperatures drop. It brings the cool air in much quicker than using open windows only. The fan is fairly noisy on speeds two and three, but one can sleep pretty comfortably with the lowest speed setting. I like the timer feature, but haven't used the thermostat feature yet. I would recommend this item for someone looking for an alternative to running the AC frequently.