Panasonic. WhisperControl humidity and temperature sensors anticipate condensation and automatically turn on the Panasonic ventilation fan. Unlike traditional sensors, which turn fans on in response to a rapid rise in humid air and therefore could cause them to switch on unnecessarily in certain climate zones, the maker says, this wall-mounted unit detects hot air and humidity based on dew point. The two models feature a blue LED light and come in white or almond. 800.211.7262. www.panasonic.com/ventfans.