ext_12692: (0)
ext_12692 ([identity profile] cdybedahl.livejournal.com) wrote in [personal profile] watervole 2010-01-07 12:42 pm (UTC)

AFAIK it's not a requirement, but you get tax breaks to install them (and they work so well) that almost all new houses get them anyway. And they can't be that hard to retrofit, because I know several people who has done that.

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