I’ve never heard of anyone in Seattle have pipes freeze in an apartment they were living in. That being said, let me put in a plug for modern insulated buildings. After freezing in drafty old rental houses, I started renting a modern condo instead and it increased my standard of living dramatically. Dishwasher, in unit washer and dryer and much better insulation! I ran my electric heat for like 15–20 minutes each night in the evening last week and that was it.