"DerbyDad03" wrote in message

IIRC 50 seemed to be the recommended number - perhaps a generic
number, albeit for a different reason than you suggest. In other
words, not generic so as to cover a national audience, but generic
enough to cover the wide swings of weather conditions near the lakes.

In any case, the OP might want to do a little research and determine
if "just above freezing" is the correct temperature for his location.

Another consideration is a safety factor. A building at 50 degrees will stay
above freezing longer in a power failure than one at 32.1111 degrees. Not a
big deal if comfort is the only consideration, but if keeping water from
doing damage, you have to plan ahead a bit.

I maintain a large (poorly insulated) building that is used for storage, but
cannot freeze. Keeping it at 45 is good for at least 30 hours.