Power waste with the climate

Has anyone ever noticed who makes the air conditioning that gives a power drop. I have the feeling that this is very in the low tours. How much power does the climate take away. 2 Question: Are there any explosions for the CTR? Or books about the structure of the car. Zb “now I’m brightening myself”? 3 Question: Has a Navi ever retrofitted in its ctr? Have mine since Wednesday. Did jem pics have it?