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 often should I clean my humidifier? How do I clean my humidifier? How can humidifiers help with a dry cough? Can I use essential oils with your humidifier?