It depends on from where you are getting it. From where I got it they were experts and the connection which was given was from fuse box and no wires were cut. Still if you are planning to get it done please be proactive and stand beside them so that they do the work properly
It is average. In extreme heat its not that much good. We have to put it on 18 degrees for a very long time but once the temperature of the cabin is around 25-26 degrees then it does a great job maintaining it
