The present invention, high efficiency flipping window-bridge air conditioners and heat pumps, generally relates to air conditioners and beat pumps. It follows the same operating theory as that of ductless mini-split air conditioners and heat pumps currently on the market. The main advantages of the current invention are high efficiency and easy installation. What is invented is that an indoor unit and an outdoor unit are linked via a frame as one package before the package is mounted and installed in a window opening. The outdoor unit is flexibly connected to the frame by joints and bars; thereby, the outdoor unit is flipped from a horizontal position to a downward vertical position and vice versa, and remain secured in the downward vertical position. The indoor unit is slidably connected to the frame by sliding chutes.