Bypass-style humidifiers are ideal for Calgary homes. They passively moisten warm air using an easy-to-replace humidifier pad, powered by the built-in furnace fan. Their only moving part is a solenoid, which rarely fails and often lasts 10 years or more. Drum-style and steam-powered humidifiers are not recommended for Calgary homes. They get calcified from our hard water, require constant maintenance, and can fail prematurely.