micheal wrote:
"tom" wrote in message
2. Use AC for car in a hot summer day
Temperature outside = 80F,
Temp of a car parked in sun for one hour = very hot, don't know
exact temp

After getting into the car
Method A: open windows, drive for a moment then close the windows
and start AC. - mine
Method B: Start AC right away without opening windows. - wife's

Question: which one make car temp drop faster and which one costs
less electricity?

2.- Method A. Get that superheated air out (140F) and start with 80F

Modified method A: Start the AC at the same time as you open the
windows. The system will take a few moments to start producing cool air,
so you might as well have it do the pre-cooling in parallel. Won't make
much difference to the energy cost, and the total time to a cool car
will be less.

After you've closed the windows, set the AC to recirculate for a while
until the car has reached a comfortable temperature. Some climate
control systems do this automatically.