Our home has combination CO/ionization units in the bedroom hallways, and ionization units in the bedrooms and great room. I am moving the CO/ionization units into the bedrooms and replacing the ionization units with dual photoelectric/ionization units. As long as you stay with the same manufacturer, the change out is pretty simple. In my case, no wiring changes (as they are hardwired units), but the bases must be changed out to accommodate the new dual units.
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