I have a new 1608 sq ft. ranch that is well insulated. It has a 2 ton sear 13 air conditioner. I live in northern Indiana. My previous house was same size and design and it had a sear 12 2.5 ton. This weekend it got up to 90 and the air ran for hours no stop. My old house would't run that much till the outside temp approched 100. Is the 2 ton too small?