Quote Originally Posted by Ohouse View Post
optional humidstat is to be connected between the "R" and "BK". Factory installed jumper "R" to "BK" on the circuit board must be cut if optional humidstat is used. .....I am lost I actually don't have humidifier so I guess I don't need humidstat.
If you keep reading that towards the end, it talks about the jumper for the blower profile.

[/quote]about 2000 sq/ft age 37 which was the age of the previous Rheem furnace (RIP) it was probably 40% vs this one which is 95%!![/QUOTE]
Are the windows updated? My guts are saying you may have an oversized A/C... but if the Manual-J says that what you need, guess it's right.