Preventing a frozen pipe on an extreme weather night
What you have done sounds like a good start. Some additional steps I would take on the coldest nights is to allow the faucet to drip. You want it to drip as slowly as you can. Moving water takes longer to freeze than still water. In addition leave the cabinet doors open so that some of the kitchen heat will warm the pipes in the cabinet. Again these are steps for the coldest nights. On really cold stormy nights I put the heat on hold @68 degrees rather than setting it lower. This gives me a cushion in the event of a power failure.