Non-Electric Humidifier by EasyComforts by EasyComforts. $7.99. Breathe easy this winter with this non-electric room humidifier. Simply add water to the 2" foam core and place over a floor vent or near a baseboard vent, heater or radiator. Moist warm air will help relieve dry nasal passages and irritated throats. Heat resistant polypropylene frame.12"L x 4"W x 2 1/4"H.