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mike[_22_]

On 1/6/2014 6:14 AM, wrote:

If it has nothing to do with the reported windchill, then you're
answer to the above question is that it makes no difference?
The pipes are just as likely to freeze in that crawlspace on a
night when the windchill is 0F, as they are when the windchill is
20F, even though the outside air is 20F, both nights?

If the wind speed at the surface of the pipe is not zero,
you expect the pipes to freeze more quickly. How much more quickly
depends on many factors...ALL of which are more important than
that number scrolling across the bottom of your TV screen.

In my crawlspace it's 55F year round virtually independent of
wind speed...because I pay attention to all those other factors
that are way more important than the windchill number scrolling
across the TV.