How cold should the air be that comes out of the houses ducts with the air conditioner on?
The air coming out of your vent should be about 16 to 20 degrees cooler than the air being sucked into your unit through the return. It is usually safe to set the unit to where it blows out at about 55 to 60 degrees. Any cooler than this means the fan is not blowing fast enough and any warmer, the fan is blowing too fast. This will work on all units if sized right.