The best replacement for warm is cool mist humidifier.

The best alternatives to warm are rated as following:
★★★★★  cool mist humidifier
★★★★★  cool colors
★★★  cool skin tone
★★  cold humidifier
★★  cool
★★  cold water
★★  cool humidifier
★★  cool undertones
★★  cold compress
★★  cold blooded
★  cool skin tones
★  cool light
★  cool mist humidifiers
★  cold mist humidifier
★  cold humidifiers
★  cool humidifiers
★  cool air humidifier
★  cold humidifier for baby
★  cold wash
  cool hair color
  cool light bulbs
  cool hair colors
  cool tones
  cool toned
  cool complexion
  cool colours
  cool mist
  cool foundation
  cold agglutinin
  cool hair tones
  cool mist vaporizer
  cold water lobster
  cold colors
  cold drinking water
  cool makeup
  cold formula
  cool undertone
  cold front
  cold baby bottle
  cool coloring
  cool mist vaporizers

Your alternative for warm is not listed? Suggest!
Speaking about warm, one probably shouldn't forget about no heat in house.

Other search terms related to warm and their ratings are:
★★★★★ no heat in house
You have in mind a companion for warm and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of warm in all years. Click on graph for more.
warm
cool mist humidifier
cool colors