Hi! Sorry for the delay. My office has had a major personnel change this week (I work for an Executive agency, and we swore in the new Governor yesterday) so things have been busy at work.
Parents got to our house at about 4PM. They couldn't find my heater, even though my mom tore the house apart. Neither could I, for that matter, when I got home after work & the dentist - not sure what happened to it. They're going to give us an extra one they have next time we see them up in NH. So they turned the heat up more to 72 downstairs (left it 68 upstairs), turned on the water, opened the faucets and dad found a faucet in the garage he thought might have a chance at being frozen further back. (We were pulling at straws as there is no crawl space in this house.) He set himself up with a hair dryer until my husband got home about 6:15. (Meanwhile, my mom got bored and organized my crafting supplies in the guest bedroom closet.)
At about 10:15PM, the kitchen faucet suddenly started working. No slow drip to alert - it just started coming out full force. We let it run a bit, then tamped it back. At 11:30PM, the master bathroom faucet started the same way. We turned the heat down less than normal overnight, to 68 I think (not 65 & 60). When we left this morning, we turned the overnight trickle off and turned the heat down a bit more but kept it higher than usual. (It's 20 degrees today, substantially warmer than the past two days, and we've never had a problem at these temps before.)
Looked around a few times but didn't see any evidence of leaks so we may have gotten lucky. We'll keep an eye on it. In the future, we'll keep the office door open when it gets colder, and when we are warned of particularly cold bursts we'll open cabinets and start the overnight trickle/keep the heat up a bit higher. Long-term, I'd like to renovate the kitchen and would add in insulation when we do that. (It's on a to do list, but we have to figure out what exactly we want to happen.)