I seriously doubt it's as much as 40 hp. Good related story:
On a lark, an acquaintance of mine decided to join me at the drag strip, bringing his '98 Jaguar XJ8 along to race. He had been running 1/4 miles in the mid 15 second range, trapping in the low 90's.
He lines up for his third pass, and the tech in the staging lane starts yelling at him-- he had been running the car with the climate control on [a/c dripping water on the track is a BIG no-no]. After that, he ran 15.2's for the rest of the evening in the mid 90's... everyone was looking at him as if he were insane, putting that Jag on the track.
FWIW, most ECU's on cars nowadays shut off the a/c in high acceleration/high rpm situations.