Instruct: Classify Amazon reviews into positive or negative sentiment
Query: LOUD.

Really disappointing. This heater is ridiculously loud. I could never sleep with this running. We had a ceramic heater in the past which was also inexpensive, but much quieter. For us there are two main features that are "must haves": 1. Heat and 2. Quiet. Completely fails on #2. If you don't care, then buy it - it just seems like all the others on the market.