Going to a series circuit in a single phase motor increases your voltage by two, and what happens to the impedence? NJATC, Motors 2nd edition; Single Phase motors, PP 162
As the voltage is doubled, impedence increases, and the current decreases, this means what for the cost of the installation?
Impedence increases by a factor of 4
An increase in voltage means less current and thus ampacity of conductors decreases, resulting in less cost in the installation.