Home Depot offers 5 Gal. Evaporative Humidifier for 4,000 sq. ft., for $169.99.
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5 Gal. water capacity
Up to 4,000 sq. ft. coverage
Up to 12.81 Gal. daily output
Digital controls and display
3-speed motor
Adjustable humidistat and automatic shut-off
Water refill and check filter indicators
Casters for easy mobility
Easy-fill dual water bottles