they should defenitly be able to wire the system to have differnt running speeds for heat, cooling, and fan only operation. There should be low voltage terminal strip in the air handler with connections marked w, y, and g witch will be for t stat connections. it sounds like the system is not wired correctly as u suspected. U can also run the boiler without the outdoor reset so the boiler will run at the full temp it is set at if u would like. Naturally this will cause it run alittle more in warmer temp but your air will be warmer.