Use a humidifier
Place bowls of water near heat sources
Air-dry laundry indoors
Keep bathroom door open after showers
Boil water on the stove
Add houseplants
Leave the dishwasher open after use
Reduce use of exhaust fans when not needed
Seal air leaks around windows and doors
Lower thermostat slightly
Keep indoor doors open for better moisture spread
Use a water tray near radiators
Dry dishes on a rack instead of towel-drying immediately
Cook with lids off occasionally
Place a fountain or water feature indoors