6
Cubic feet of space
4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 16000 17000 18000 19000 20000 21000 22000 23000 24000
Tight
HM506 $0.76 $2.08
HM509 $1.96 $2.89
HM512 $2.53
Average
HM506 $0.76 $2.13
HM509 $2.00 $3.47
HM512 $3.03
Loose
HM506
HM509 $1.16 $3.20
HM512 $ 2.80
*Listed values are average daily operating costs to achieve 35% RH, per AHRI guidelines.
Chart 6: Sizing recommendations based on cubic feet and insulation type.
Home size
(sq. ft.)
Humidity
needed
(GPD per AHRI)
TrueSTEAM
HM506 HM509 HM512
500 0.1 $0.76 $0.99 $1.15
1000 2.3 $1.04 $1.00 $1.16
1500 4.4 $2.08 $1.96 $1.71
2000 6.5 $3.08 $2.89 $2.53
2500 8.6 $3.08* $3.82 $3.35
3000 10.7 $3.08* $3.82* $4.55
*Gray indicates 35%RH cannot be achieved under these conditions
Additional Considerations
There are additional considerations beyond square footage to appropriately size TrueSTEAM to the home. The following is a list of general
questions that relate to these variables.
What if my ceilings are higher than 8 feet?
The sizing listed above is based on square footage with a ceiling height of 8 feet. If the ceiling is higher than 8 feet, the total cubic feet should
be taken into consideration for proper sizing of the device. For example, if the ceiling is 10 feet instead of 8, there is 25% more air volume to
consider.
Converting square footage to cubic requires multiplying the square footage by the ceiling height (i.e., 2000 square foot space with 10 foot
ceilings is 20000 cubic feet). Converting AHRI's standard to cubic feet, Chart 5 shows the daily load requirements in cubic feet. In general, the
higher the ceilings, the smaller the square footage space each TrueSTEAM model will cover since it must humidify the additional air volume.
Cubic feet of space
Construction Type 4000 8000 12000 16000 20000 24000
Humidity needed (GPD per AHRI)
Tight 0.1 2.2 4.4 6.5 8.6 10.7
Average 1.3 4.5 7.8 11.1 14.3 17.6
Loose 2.6 7.2 11.8 16.4 21 25.6
Chart 4: National average daily operating costs to achieve 35% RH in a tight-fit home with 8-foot ceilings and people living in it.
Chart 5: AHRI humidity load requirements* in cubic feet.
*Based on people living in the home.
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