In a home, at least one per heating/cooling zone. In homes
where air flow to/from rooms/areas can be controlled (e.g.,
servo'd dampers), at least one for each such controlled area.
Add to that areas where you would want to know about other
aspects of air "quality" and its easy to see having LOTS
I.e., any place where you would want to know qualities of
the air in order to make control decisions.
As you're typically dealing with a bunch of loosely coupled
systems (e.g. "rooms"), what you do in one affects others
and what you *see* in one reflects what's happening in
In commercial spaces, this gets even more intertwined -- more
rooms, more ways for things (air) to interact.
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