If our 205H's are any indication, when relatively idle they should be drawing 8 to 9 watts.
This will show up as 8000-9000 mW if you do check the switch supplying the power.
(on a MAS, the command is "show poe")
Check yours at the customer site. If they are drawing significantly more than that, something in
the configuration may be making them work extra hard. We run in decrypt-tunnel mode, so in theory
ours may be working harder than some other places, and most of our APs are using around 8300mW.
There's a reason these things need PoE+ -- they use a lot of power at peak, and almost all of it
ends up being CPU waste heat that needs to be jettisoned. If your customer needs something
that runs cooler you may not be able to use 11ac with today's chipsets -- but the power draw will
tell you approximately how hot the AP will get, though the size of the heat sink matters as well.