Additional Considerations - Honeywell TrueSTEAM Series Reference Manual

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.
Home size Humidity
(sq. ft.) needed
(GPD per AHRI)
500 0.1
1000 2.3
1500 4.4
2000 6.5
2500 8.6
3000 10.7
*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.
Chart 5: AHRI humidity load requirements* in cubic feet.
Construction Type 4000
Tight 0.1
Average 1.3
Loose 2.6
*Based on people living in the home.
Chart 6: Sizing recommendations based on cubic feet and insulation type.
Cubic feet of space
4000 5000
HM506 $0.76
Tight HM509
HM512
HM506 $0.76
HM509
Average
HM512
HM506
Loose HM509 $1.16
HM512
*Listed values are average daily operating costs to achieve 35% RH, per AHRI guidelines.
6
HM506
$0.76
$1.04
$2.08
$3.08
$3.08*
$3.08*
Cubic feet of space
8000 12000 16000 20000
Humidity needed (GPD per AHRI)
2.2 4.4 6.5 8.6
4.5 7.8 11.1 14.3
7.2 11.8 16.4 21
6000 7000 8000 9000 10000
$2.13
$2.00 $3.47
$3.03
$3.20
$ 2.80
TrueSTEAM
HM509 HM512
$0.99 $1.15
$1.00 $1.16
$1.96 $1.71
$2.89 $2.53
$3.82 $3.35
$3.82* $4.55
24000
10.7
17.6
25.6
11000 12000 13000 14000 15000
$2.08
$1.96
16000 17000 18000 19000 20000
$2.89
$2.53
21000 22000 23000 24000