Evaporative Cooling Humidity Index

The True Guide to Evaporative Cooler performance is
DEW POINT not HUMIDITY

Note: If the Dew Point & Humidity are typically too high in your area look to our Ice Models

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Check the prevailing Dew Point in your Area. If the Dew Point is 55 Degrees or more Evaporative Cooling will not work to its potential. We do not shut them off if that is the only cooling available, however, they will just not keep you as comfortable as you would prefer. To find the Dew Point in your area click on your favorite weather site and put in your City and State for present readings.

If you do not have a favorite site for the USA try: http://www.wunderground.com/US/Region/US/Dewpoint.html

If you do not have a favorite site for the Europe try:
http://www.wunderground.com/global/Region/eu/Dewpoint.html

Note the Dew Point Colors; If your area is in the Yellow, Green or Blue Evaporative Cooling will work normal as it is below 55 Degrees. At the top of the linked page you may put your City and State in for accurate readings. You can then get the history for the Dew Point in your area by looking below the statistics to the Historical Section and click several dates for a good overview of Dew Point. You will notice that as the day heats up the Dew Point will often drop below the higher levels. By using the Historical Section you will have a good idea of the average Dew Point in your area to see which months are best for Evaporative Cooling or if Evaporative Cooling is a good option for you.

You can check the Continental USA Map or World Map to see if your location is considered suitable for Evaporative Cooling.

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Fahrenheit Humidity Index

Celsius Humidity Index

Check the Continental USA Map or World Map to see if Evaporative Cooling or Air Conditioning is recommended for your area.

Use Temperature and Humidity to determine the output Temperature of a Swampy 12-Volt Evaporative Cooler

Fahrenheit
Illustration

Humidity%

5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80

Example: 96° and humidity 35% results in Swampys cool air output 78°

A
I
R

T
E
M
P
E
R
A
T
U
R
E
75 52 53 55 56 58 59 60 62 63 64 66 67 68 69 70 71

78 53 55 57 58 60 61 63 64 65 67 68 69 70 72 73 74

81 55 57 59 60 62 64 65 67 68 69 71 72 73 74 76 77

84 57 59 61 63 64 66 67 69 70 72 73 75 76 77 78 80

87 59 61 63 65 66 68 70 71 73 74 76 77 79 80 81 82

90 60 63 65 67 69 70 72 74 75 77 78 80 81 83 84 85

93 62 64 67 69 71 73 74 76 78 80 81 83 84 85 87 88

96 64 67 69 72 74 76 78 80 82 84 86 87 89 90 92 93

99 65 68 70 73 75 77 79 81 83 85 86 88 89 91 92 94

102 67 70 72 75 77 79 81 83 85 87 89 91 92 94 95 97

105 68 71 74 77 79 82 84 86 88 90 92 93 95 97 98 100

108 70 73 76 79 81 84 86 88 90 92 94 96 98 100 101 102

111 72 75 78 81 84 86 89 91 93 95 97 99 100 102 103 105

114 73 77 80 83 86 88 91 93 95 98 100 101 103 104 106 108

117 75 78 82 85 88 91 93 96 98 100 102 104 105 107 109 110

120 76 80 84 87 90 93 96 98 100 102 104 109 108 110 112 113

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Check the Continental USA Map or World Map to see if Evaporative Cooling or Air Conditioning is recommended for your area.

Celsius
Illustration
Humidity%

5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80

Example: 37.2° and humidity 35% results in Swampys cool air output of 26.1°

A
I
R

T
E
M
P
E
R
A
T
U
R
E
23.9 11.1 11.7 12.8 13.3 14.4 15.0 15.6 16.7 17.2 17.8 18.9 19.4 20.0 20.6 21.1 21.7

25.6 11.7 12.7 13.9 14.4 15.6 16.1 17.2 17.8 18.3 19.4 20.0 20.6 21.1 22.2 22.8 23.3

27.2 12.8 13.9 15.0 15.6 16.7 17.8 18.3 19.4 20.0 20.6 21.7 22.2 22.8 23.3 24.4 25.0

28.9 13.9 15.0 16.1 17.2 17.8 18.9 19.4 20.6 21.1 22.2 22.8 23.9 24.4 25.0 25.6 26.7

30.6 15.0 16.1 17.2 18.3 18.9 20.0 21.1 21.7 22.8 23.3 24.4 25.0 26.1 26.7 27.2 27.8

32.2 15.6 17.2 18.3 19.4 20.6 21.1 22.2 23.3 23.9 25.0 25.6 26.7 27.2 28.3 28.9 29.4

33.9 16.7 17.8 19.4 20.6 21.1 22.8 23.3 24.4 25.6 26.7 27.2 28.3 28.9 29.4 30.6 31.1

35.6 17.8 19.4 20.6 22.2 23.3 24.4 25.6 26.7 27.8 28.9 30.0 30.6 31.7 32.2 33.3 33.9

37.2 18.3 20.6 21.1 22.8 23.9 25.0 26.1 27.2 28.3 29.4 30.0 31.1 31.7 32.8 33.3 34.4

38.9 19.4 21.1 22.2 23.9 25.0 26.1 27.2 28.3 29.4 30.6 31.7 32.8 33.3 34.4 35.0 36.1

40.6 21.2 21.7 23.3 25.0 26.1 27.8 28.9 30.0 31.1 32.2 33.3 33.9 35.0 36.1 36.7 37.8

42.2 21.1 22.8 24.4 26.1 27.2 28.9 30.0 31.1 32.2 33.3 34.4 35.6 36.7 37.8 38.3 38.9

43.9 22.2 23.9 25.6 27.2 28.9 39.0 31.7 32.8 33.9 35.0 36.1 37.2 37.8 38.9 39.4 40.6

45.6 22.8 25.0 26.7 28.3 30.0 31.1 32.8 33.9 35.0 36.7 37.8 38.3 39.4 40.0 41.1 42.2

47.2 23.9 25.6 27.8 29.4 31.1 32.8 33.9 35.6 36.7 37.8 38.9 40.0 40.6 41.7 42.8 43.4

48.9 24.4 26.7 28.9 30.6 32.2 33.9 35.6 36.7 37.8 38.9 40.0 42.2 42.8 43.4 44.4 45.0

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The Powerful 12-volt & 110-volt Air Conditioners & Evaporative Coolers
Swampy, Icester & IceMystr

Swampy 12-Volt Cooling Systemsare Proudly made in the USA

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Serving the World from Mesa, AZ. USA Since 1989

Latest update 5/01/2011

Fahrenheit Illustration		Humidity%
		5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80
		*Example: 96° and humidity 35% results in Swampys* cool air output 78°**
A I R T E M P E R A T U R E	75	52	53	55	56	58	59	60	62	63	64	66	67	68	69	70	71
	78	53	55	57	58	60	61	63	64	65	67	68	69	70	72	73	74
	81	55	57	59	60	62	64	65	67	68	69	71	72	73	74	76	77
	84	57	59	61	63	64	66	67	69	70	72	73	75	76	77	78	80
	87	59	61	63	65	66	68	70	71	73	74	76	77	79	80	81	82
	90	60	63	65	67	69	70	72	74	75	77	78	80	81	83	84	85
	93	62	64	67	69	71	73	74	76	78	80	81	83	84	85	87	88
	96	64	67	69	72	74	76	78	80	82	84	86	87	89	90	92	93
	99	65	68	70	73	75	77	79	81	83	85	86	88	89	91	92	94
	102	67	70	72	75	77	79	81	83	85	87	89	91	92	94	95	97
	105	68	71	74	77	79	82	84	86	88	90	92	93	95	97	98	100
	108	70	73	76	79	81	84	86	88	90	92	94	96	98	100	101	102
	111	72	75	78	81	84	86	89	91	93	95	97	99	100	102	103	105
	114	73	77	80	83	86	88	91	93	95	98	100	101	103	104	106	108
	117	75	78	82	85	88	91	93	96	98	100	102	104	105	107	109	110
	120	76	80	84	87	90	93	96	98	100	102	104	109	108	110	112	113

Celsius Illustration		Humidity%
		5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80
		*Example: 37.2° and humidity 35% results in Swampys* cool air output of 26.1°**
A I R T E M P E R A T U R E	23.9	11.1	11.7	12.8	13.3	14.4	15.0	15.6	16.7	17.2	17.8	18.9	19.4	20.0	20.6	21.1	21.7
	25.6	11.7	12.7	13.9	14.4	15.6	16.1	17.2	17.8	18.3	19.4	20.0	20.6	21.1	22.2	22.8	23.3
	27.2	12.8	13.9	15.0	15.6	16.7	17.8	18.3	19.4	20.0	20.6	21.7	22.2	22.8	23.3	24.4	25.0
	28.9	13.9	15.0	16.1	17.2	17.8	18.9	19.4	20.6	21.1	22.2	22.8	23.9	24.4	25.0	25.6	26.7
	30.6	15.0	16.1	17.2	18.3	18.9	20.0	21.1	21.7	22.8	23.3	24.4	25.0	26.1	26.7	27.2	27.8
	32.2	15.6	17.2	18.3	19.4	20.6	21.1	22.2	23.3	23.9	25.0	25.6	26.7	27.2	28.3	28.9	29.4
	33.9	16.7	17.8	19.4	20.6	21.1	22.8	23.3	24.4	25.6	26.7	27.2	28.3	28.9	29.4	30.6	31.1
	35.6	17.8	19.4	20.6	22.2	23.3	24.4	25.6	26.7	27.8	28.9	30.0	30.6	31.7	32.2	33.3	33.9
	37.2	18.3	20.6	21.1	22.8	23.9	25.0	26.1	27.2	28.3	29.4	30.0	31.1	31.7	32.8	33.3	34.4
	38.9	19.4	21.1	22.2	23.9	25.0	26.1	27.2	28.3	29.4	30.6	31.7	32.8	33.3	34.4	35.0	36.1
	40.6	21.2	21.7	23.3	25.0	26.1	27.8	28.9	30.0	31.1	32.2	33.3	33.9	35.0	36.1	36.7	37.8
	42.2	21.1	22.8	24.4	26.1	27.2	28.9	30.0	31.1	32.2	33.3	34.4	35.6	36.7	37.8	38.3	38.9
	43.9	22.2	23.9	25.6	27.2	28.9	39.0	31.7	32.8	33.9	35.0	36.1	37.2	37.8	38.9	39.4	40.6
	45.6	22.8	25.0	26.7	28.3	30.0	31.1	32.8	33.9	35.0	36.7	37.8	38.3	39.4	40.0	41.1	42.2
	47.2	23.9	25.6	27.8	29.4	31.1	32.8	33.9	35.6	36.7	37.8	38.9	40.0	40.6	41.7	42.8	43.4
	48.9	24.4	26.7	28.9	30.6	32.2	33.9	35.6	36.7	37.8	38.9	40.0	42.2	42.8	43.4	44.4	45.0