So most of you would ask yourselves, what size humidifier do I need for my house? Well, you have to look at a few factors in order to get a good humidifier that will suit your house. Getting the most for your money from a home humidifier relies on sizing your system correctly. While portable and tabletop humidifiers are easily deployable—you can simply add or subtract the amount of humidifiers running based on your needs—whole house humidifier systems require a little more precision.
What Size Humidifier Do I Need For My House?
Well, there are a few things to consider when buying a humidifier that will perfectly suit your home. Below we have briefly explained each factor.
Humidity Output Gallons Per Day vs. Tank Size
The power of your whole home humidifier is measured by gallons per day (GPD). GPD refers to the amount of moisture that the humidifier can put out while running continuously. This, of course, will not be the same as the amount of water you put in the tank—though that measurement is important, too. Most high end whole house humidifiers have a direct water line, which obviates the need for changing the tank. For home humidifiers that don’t have direct lines, you will have to continually check and refill the water tank. Consider this when choosing a home humidifier system. Also, you must decide whether you will need a filter or non filter humidifier to be precise.
Home Factors: Size and Insulation
The two determining factors in sizing your home humidifier system are size and “tightness” of your home. That is, how well insulated your house is. For example, a well-insulated home with storm doors and windows, vapor barriers and weather stripping is a “tight home.” If you’ve recently had an energy audit and followed up on all the recommended weatherproofing measures, you likely have a “tight home.” Otherwise, you probably have an “average home.” If you have some glaring insulation issues—such as undampened fireplaces, no storm windows or doors and poor insulation—then you have what is referred to as a “loose home.”
For a tight home, you’ll want a humidifier system with an output of about 1.4 GPD, 3.2 GPD, 4.9 GPD, 6.6 GPD or 8.3 GPD for home sizes of 1,000 sq. ft, 1,500 sq. ft, 2,000 sq. ft, 2,500 sq. ft. and 3,000 sq. ft., respectively. For tight homes with only 500 sq. ft., you can probably get by with a tabletop humidifier.
Average homes should get humidifier systems with 0.5 GPD, 3.0 GPD, 5.5 GPD, 8.0 GPD, 10.5 GPD or 13.0 GPD for home sizes of 500 sq. ft, 1,000 sq. ft, 1,500 sq. ft, 2,000 sq. ft, 2,500 sq. ft or 3,000 sq. ft., respectively.
Loose homes require home humidifier outputs of 1.0 GPD, 4.0 GPD, 7.0 GPD, 10.0 GPD, 13.1 GPD and 16.1 GPD for home sizes of 500 sq. ft, 1,000 sq. ft., 1,500 sq. ft., 2,000 sq. ft., 2,500 sq. ft. and 3,000 sq. ft., respectively.
In summary, bigger houses with looser insulation will need home humidifiers with greater humidifier outputs. With this in mind, it’s highly recommended that you get an energy audit and improve your insulation before installing a home humidifier system. Also, be sure to consult an installer of whole house humidifiers on the specifics of your home. These figures are rules of thumb, and other factors—such as climate and ceiling height—may change your ideal home humidifier size.