How durable is the contactor supposed to be? The reason I ask is because I understand that it is a relatively expensive part to replace and it bothers me that the contactor opens every time a door gets opened. Whenever we go out as a family (almost daily), we all seem to get In the car within a few minutes of each other so he contactor opens and closes multiple times. Then another time when it charges. Then when we get home, someone will go back to the car to get something out that was left in the car...another contactor open/close cycle. Is is this something about which I should be concerned? Why does the contactor need to close whenever a door is opened? My thought is because the car has a "feature" that turns on the HVAC when you open the door, which brings up another concern....I hate the the AC turns on if I just need to open the door for a second. I know I can turn off the HVAC when exiting the car so that doesn't happen, but my wife doesn't do that. If if that's the only reason the contactor engages when opening the door, it would be nice if that didn't happen if the HVAC was off. This would save the contactor from unnecessary cycles. Thoughts?