No. of Recommendations: 1
In fact I asked the home builder representative and they said for my model home they use 1.5 ton units! My home is 1500 square feet, two stories in heigth and is located in the Pacific NW. Am I wrong thinking that this size air conditioner is not enough? They only guarantee 78 degrees or 15 degree differential between interior temp and exterior temp.

It's better to have a (slightly) undersized unit than an oversized unit. For new construction of that size, 1.5 T should be plenty - but it depends on construction (both design and implementation), siting of the building, etc. My guess would be that someone has done load calculations on the design to verify that number - ask to see them.

BTW, 78 F or 15 F delta is a reasonable spec.

You might also want to ask your question on hvac-talk - there are a lot of working pros on that site.
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