It could be something in the new house. Do you have a different kind of refrigerator that goes through a defrost cycle or something at night? Water softener? Try to think of things that they might hear but you might not. They will get used to it. Mine bark at *everything* except when people rev their engines because my neighbor is constantly revving his engine and they are used to it. Weird what they get used to... We live in a townhouse and literally share a driveway with 3 other houses and they know what all the other 6 cars sound like but bark at a new/different sounding car. They are smart
