I performed a cooling preventative maintenance. I addressed the concerns of efficiency on the system. I found initially the unit only splitting 18° and the blower setting on medium. I inspect the system and found the indoor coil was not fully seated on the base and allowing unconditioned air to bypass the coil. I remounted the indoor coil and sealed gaps with foil tape. I changed the blower speed back to high and verified gauge readings and temperature split. The house dropped 2° after the changes were made and achieved a 20° split. The unit is operating properly at this time