Unless you bi-pass the PS system your not realy doing much, the A/C realy is only a drag with the system is on and at WOT the A/C is turned off by the ecu.
the smog pump is maybe a little bit of power but the PS is the biggie.
I think its a waste of how ever much you have to pay for the belt. the a/c compressor acts only as an idler pulley when it is turned off anyway so no horsepower will be robbed by it
i have always heard and read that the fewer accessories you are pushing, the more power you make. i also have a humming noise at low load that i suspect is the idler pulley. i was thinking that i could bypass it (and the a/c) for a few months and that would tell me if it is the pulley and buy me some time to replace it.
how much does a belt cost?
if the a/c doesn't add any drag when it isn't in use, why do people delete it, for the weight savings?
btw, winters in dc are usually pretty mild and it is pretty dry.