There are a few things to note about the Irish MK3s that differenciate them from their British cousins apart from the automatic doors on the irish fleet.
CIE ran everything using 220/380V 50Hz 3-phase (same as the power supplied to any Irish or European building).. this gave them a lot more scope for add-on equipment and is generally easier to work with.
The heating system is different and the air con units aren't quite the same either due to the power supply differences.
It's also worth noting that the IE MK3 fleet is substantially younger than the MK3s commonly found in the UK.
CIE's fleet dates from 1984 onwards, much of it is younger than the LHB Darts.
By the 1980s the BREL air conditioning systems had improved a tad!
I have no idea who makes the air con kit on IE's fleet, but I would agree it generally does work. The coach-end doors being open at either end can render it much less effective though.
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