Should I use a humidifier when I am using a heater to keep moisture in the air? Jessica November 24, 2021 16:18 Updated You should use a humidifier if you're using a gas heater, because they have a tendency to dry out the air. Related articles Can humidifiers reduce snoring? How can humidifiers help with a dry cough? Why does my humidifier seem to be producing a heavy white mist/dust? Can humidifiers prevent influenza? Is a humidifier good for house plants?