1. A method for adjusting pressure within an air bed comprising: providing an air bed, the air bed including an air chamber and a pump having a pump housing; selecting a desired pressure setpoint for the air chamber; calculating a pressure target, wherein the pressure target is calculated based upon the desired pressure setpoint and a pressure adjustment factor; adjusting pressure within the air chamber until a pressure within the pump housing is substantially equal to the pressure target; determining an actual chamber pressure within the air chamber; comparing the actual chamber pressure to the desired pressure setpoint to determine an adjustment factor error; and modifying the pressure adjustment factor based upon the adjustment factor error.