Powering American Jobs Act of 2014 - Amends the Internal Revenue Code to extend through 2015: (1) the tax credit for nonbusiness energy efficient improvements; (2) excise tax credits and payments for alternative fuels, biodiesel and renewable diesel fuel mixtures, and alternative fuels relating to liquefied hydrogen; (3) the tax credit for alternative fuel vehicle refueling property expenditures; and (4) the income tax credit for biodiesel and renewable fuels. Equalizes the excise tax rate for liquefied natural gas and liquefied petroleum gas. Modifies energy efficiency standards for windows, doors, skylights, roofing, water heaters, biomass stoves, and furnaces or hot water boilers.