As Dixi said - the less braking force you apply, or the later you apply the brakes (at lower speed), the less of the total energy is dissipated by brakes and more by aerodynamic forces and reverse thrust.
I did the same experiment as Dixi in A320. With medium weight, idle reverse and some headwind it took 2500-2700 meters to decelerate without touching the brakes.
Having said that, according to Airbus, there's no benefit of keeping the carbon brakes cool (except for short turnaround considerations). Carbon brakes wear does not depend on brake energy absorbed, but primarily on number of applications. Also, they actually wear more at low and moderate temperatures (100-250deg) than at higher temperatures! Only when you exceed ~500degs, the wear increases again due to oxidation.
Have a look at the following video
https://m.youtube.com/watch?list=PLF...&v=SG4Aw5BujEU