I think your husband is wrong, and it is not your fault.
When i leave for more than 24 hrs. In one minute I can close the main
incomming with a 1/2 turn ball valve open a house drain and open all
sinks, showers and flush the toilets, leaving the house empty and
freeze proof to all but extremes. For 35$ I have a freeze sensor that
calls me if the furnace breaks and temps go to 42f.
It is Not your fault babe, It is his lack of planing understanding of
water catastrophies. Water damage is Hell, but can be minimised by