We're out of town until mid next week. Dunno how concerned to be about my pipes. Turned off water at valve in crawl space before we left, and left kitchen faucet open. Mainly concerned about the section of pipe upstream of the valve. If that freezes, bursts, then thaws, guess I'll have a flooded crawlspace and garage when we return. Put the main level thermostat at 72 last night, hope that heat transferred into the crawl space enough I guess...