Hello, New models sure do have house wiring to connect to- but you just have to buy the right type of smoke detectors. "Hard-Wired" is what you need to look for, not the cheap battery only models. Here is a source where you can choose what hard-wired units you want to use. They all use the 3 wire connection- hot, neutral and then they talk to each other through the ground. Any of the units at the link below will work just fine and they all have the little compartment to make your wire connections inside (as well as have a backup battery in case of a power outage):
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