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RECOMMENDED RELATIVE HUMIDITY BY OUTDOOR TEMPERATURE
OUTDOOR TEMP
_F(_C)
OUTDOOR RELATIVE HUMIDITY
(%)
INDOOR RELATIVE HUMIDITY
(%) W/O HUMIDIFIER*
MAX RECOMMENDED INDOOR
RELATIVE HUMIDITY{
--- 10 ( --- 23) 30 to 70 1to2 20 (Lo)
0 ( --- 18) 30 to 70 2to4 25
10 (---12) 30 to 70 3to6 30
20 (---7) 30 to 70 4to10 35
30 (---1) 30 to 70 6to15 40 (Med)
* Indoor relative humidity level when outdoor air is heated to 72_F/22_C.
{ As stipulated by the Air Conditioning Contractors of America.
INDOOR RELATIVE HUMIDITY LIMIT FOR NO WINDOW CONDENSATION
(Indoor Air at 74_F/23_CDryBulb)
OUTDOOR TEMPERATURE
_F(_C)
SINGLE PANE WINDOWS (%) DOUBLE PANE WINDOWS (%)
40 (4) 39 59
30 (---1) 29 50
20 (---7) 21 43
10 (---12) 15 36
0 ( --- 18) 10 30
--- 10 ( --- 23) 7 26
--- 20 ( --- 29) 5 21
--- 30 ( --- 34) 3 17
MAXIMUM MOISTURE REQUIREMENTS*
VOLUME OF RESIDENCE
CUBIC FEET
(CUBIC METER)
TIGHT HOUSE AVERAGE HOUSE
POUNDS
(KILOGRAMS) PER
HOUR
GALLONS (LITERS)
PER DAY
POUNDS
(KILOGRAMS) PER
HOUR
GALLONS (LITERS)
PER DAY
8,000 (227) 1.76 (0.8) 5.09 (19) 3.52 (1.6) 10.17 (38)
10,000 (283) 2.21 (1.0) 6.35 (24) 4.41 (2.0) 12.72 (48)
12,000 (340) 2.64 (1.2) 7.63 (29) 5.29 (2.4) 15.26 (58)
14,000 (396) 3.09 (1.4) 8.91 (34) 5.92 (2.7) 17.08 (65)
16,000 (453) 3.53 (1.6) 10.18 (39) 7.06 (3.2) 20.35 (77)
18,000 (510) 3.97 (1.8) 11.45 (43) 7.94 (3.6) 22.89 (87)
20,000 (566) 4.41 (2.0) 12.72 (48) 8.82 (4.0) 25.44 (96)
22,000 (623) 4.85 (2.2) 13.99 (53) 9.71 (4.4) 27.98 (106)
24,000 (680) 5.29 (2.4) 15.27 (58) 10.59 (4.8) 30.52 (116)
26,000 (736) 5.74 (2.6) 16.54 (63) 11.47 (5.2) 33.07 (125)
28,000 (793) 6.18 (2.8) 17.81 (67) 12.35 (5.6) 35.61 (135)
30,000 (850) 6.62 (3.0) 19.08 (72) 13.24 (6.0) 38.16 (144)
* Based on design conditions of outdoor 20_F/ ---7_C dry bulb, 80% RH; indoor 70_F/21_C dry bulb, 40% RH, and minimum moisture production from residen-
tial operations for an a bsolute humidity difference of 0.0049 lb/hr.
NOTE:
Tight house is defined as being well insulated, having vapor barriers, tight storm doorsand windowswith weatherstripping, and having damperedfireplaces.
Average house is defined as being insulated, having vapor barriers, loose storm door and windows and having dampered fireplace.
HUM