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re: crawlspace ventilation
21 aug 2000
pb   wrote:

>this weekend, i was in my crawlspace and was dissapointed to find out
>that i have a bad moisture problem... i'm considering replacing a block
>on each end with one of those special blocks that have screened vents
>in it for some cross-ventilation.  is this a good idea?

sounds good to me. use the automatic versions (eg leslie-locke's $12
afv-1b) with bimetallic springs that close the louvers in wintertime.

or maybe install a ceiling fan in the floor and fill the crawlspace with
55 gallon water drums with a dew point controller or condensation drain,
and use it for cooling the house by drawing in cool outdoor air at night
and circulating air between the house and the crawlspace during the day... 

average daily min, 24-hour, and daily max temps look like this in phila: 

jan   feb   mar   apr   may   jun   jul   aug   sep   oct   nov   dec

22.8  24.8  33.2  42.1  52.7  61.8  67.2  66.3  58.7  46.4  37.6  28.1
30.4  33.0  42.4  52.4  62.9  71.8  76.7  75.5  68.2  56.4  46.4  35.8
37.9  41.0  51.6  62.6  73.1  81.7  86.1  84.6  77.6  66.3  55.1  43.4

a house with lots of internal thermal mass and mass surface and selective
ventilation might need no ac in phila...

and it might need no heat in phoenix, az... 

jan   feb   mar   apr   may   jun   jul   aug   sep   oct   nov   dec  

41.2  44.7  48.8  55.3  63.9  72.9  81.0  79.2  72.8  60.8  48.9  41.8
53.6  57.7  62.2  69.9  78.8  88.2  93.5  91.5  85.6  74.5  61.9  54.1
65.9  70.7  75.5  84.5  93.6  103.5 105.9 103.7 98.3  88.1  74.9  66.2

nick




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