No it wont. It shouldnt have to.

It should when you turn A/C on, because thats driven directly off the motor.

If your idle is dropping noticeably when all youre doing is headlights on, or brake pedal, then you need to check and see if the alternator is still sweet.

Go down to any auto shop, and get yourself a multimeter, and then put measure the voltage across the battery terminals while the car is running.

If its any less than about 13.5volts, good chance the problem lies within the alternator.