No that's not true, you could oversize the system or improve your insulation. The condensing temperature is typically 45 F and the evaporating temperature is ty

No that's not true, you could oversize the system or improve your insulation. The condensing temperature is typically 45 F and the evaporating temperature is typically 120 F - in layman's terms if the building were perfectly insulated, you could get it to 45 F as long as the external temp didn't go above 120 F.