I remember doing that while living in Taiwan. At least the climate in Boston makes having lukewarm water more bearable. When you are sweating in a tropical summer the last thing you want is a warm glass of water.
Traditionally China has been the same way: Whenever somebody gives you a glass of water it is always warm so that the receiver knows that it has been boiled, and is safe to drink. It often takes foreigners a while to adjust.
/in China and Taiwan this year