I just had a new unit with furnace and ac installed. I have a 1300 square ft house. The ac unit is 2 ton and furnace is 80000 BTU. My ac seems to run all the time and doesn't cycle on and off, is this normal for and ac to run all the time.

Try raising the temperature on the thermostat and see if it cuts off, may have a couple of minutes delay.

Sounds like a ductwork and instulation problem. Or could be low on freon, does the ac line sweat?