Hi, I live in south Texas where is very hot. For example today is 106F. I need a new air condition unit, and I wanted your help deciding on which unit. I live in a 1665 sq ft. one floor with two french door and a stucco building. the house is appprox. 30 years old. Iwill like to know what size air condition, what brand air condition, and what SAAR number air condition 12, 14 etc.