How much water does a whole-house humidifier typically use in one day? (1500-2000 sf home) 0-2 gallons 20% 2-5 gallons 20% 15-20 gallons 10% Not sure 50% Get Free Quotes Today! Question: How much water does a whole-house humidifier typically use in one day? (1500-2000 sf home) Top Answer (50% of 10 votes): Not sure. Answer: 0-2 gallons Explanation: yes HVAC Philly Inc Answer: 2-5 gallons Explanation: This answer depends on how dry your air is. Arizona's Best Heating & AC, Inc. Answer: Not sure Explanation: based on many factors HVAC and More Get Free Quotes From Local Pros ProMatcher Get Free Quotes Today! Find Local Pros Free Whole House Humidifier Installation Cost Estimates Related Questions How Much Does It Cost to Replace Humidifier on Furnace? Can I install a whole house humidifier without a forced air system?Top answer: In some cases Do I need a permit to install a central humidifier?Top answer: In some cases Who can install a whole house humidifier? Can I install a whole house humidifier if I have a heat pump?Top answer: In most cases