Mmmmm ...
What exactly do you mean by "Power Failures" re the EC 145?
The A/C in the 139 I believe are basically the same units as found on IVECO trucks. There are 2 units fitted .... a forward unit and a rear. When they're working they seem to work well (though my experience with them is in Middle east climates and they tend to "fail" regularly which usually just means recycle them "Off" then "On" and all is well (for awhile).