Abstract: An air conditioning mounting bracket assembly is a fully adjustable bracket assembly designed to be installed on the exterior of a window or thru wall air conditioner, manufactured of heavy duty steel and plastic Plexi-material for strength and durability. Sheeting material will encompass the entire exterior of the A/C unit, with grating integrated into the support plates to allow free circulation of air. Screws and hook and loop material will be included for use in mounting the assembly to the exterior of the window frame, and heavy duty threaded bolts are included to mount the A/C unit to the mounting assembly. Telescoping components enable the user to lengthen or shorten the assembly in accordance to the dimensions of the window frame or wall niche.