I have replaced my AC and duct work only to discover the AC still won't keep up in the heat of the day. Inside temp won't go below 81 in the heat of the day but will go down to 70 at night, so the AC is good. I have been told by 3 AC companies that the 4 ton unit is good in my 2100 square ft home. I have a small ridge vent on my low hip roof. I have installed an attic fan and still no relief. What should I do now? Static vents? How many? What type? I have soffit vents and have been told by an attic insullation company that my attic temp gets up to 140 degrees. I'm not made of money, but need relief from our hot Texas summers. Will soon install cellulose insullation, but want to try other options if they make sense. Please help! Did I mention that my electric bill is in excess of $400 in the summer?