How to handle oversize quote
So I am building in a rural area where there really is a single major company. Their quote was fine and they have a good reputation except for one thing.
The house is 2100 sq feet split evenly on 2 floors and they want to do 2.5 ton down and 2 ton up in an area with a 91/26 design temp. My calcs put it at 2 and 1.5 with the best I could do on HVAC-calc. I am not particularly worried because the house has 80% east windows which really are overcounted in the manual J algorithm. They are counted the same as west windows despite the west being far more important as peak load.
The contractor response to me requesting the lower tonnage was "maybe we aren't the right contractor for you". It was handled by the builder so I don't have any more details of how it went.
Honestly, they put the ducts in the attic despite them being in conditioned space between floors and they left off a 12 foot overhang on some large windows. The infiltration was too high etc. My builder didn't want to point out their mistakes but just stated it was a customer's request.
My thought is to tell them we are putting awnings on all the windows and foaming the attic rafters or some other lie. But it might seem pretty transparent at this point.
I am definitely going to try to get other contractors but it really maybe going with someone 1/2 hour away that has a much higher quote and won't be as available if there are problems.