Smoke and CO2. ALL OVER THE PLACE.

The prior owners put them in when they were getting ready to sell. Didn't check the Code, so the first round were in the wrong places. So they added more. There are ones on the wall AND the ceiling in many places, both inside and outside the bedrooms. So FOUR per bedroom!!! Then there's the kitchen, cellar stairs, cellar itself, and on and on. We have more than double the smoke detectors required.

I figure the price of batteries isn't much compared to . . . . So I keep them ALL in working order.

It's only a nuisance with the "wrong" ones in the kitchen, as I love to cook and beep! beep! beep! happens.

The CO2 are in the right palces.