In a 2400 Sq ft home w/ 8 rooms spread on two floors (7 on floor 1; 1 on floor 2) there is a central Central Air system (and heat pump). The entire home is a single zone w/ the thermostat in the largest room on floor 1. What is a reasonable expectation in regards to how much the temperature would vary from the room w/ the thermostat? I know that in a perfect world, the temperature would be identical in each room, but I also know that this probably not realistic. I also know that if it varies by 10 degrees from the room w/ the thermostat, there is a problem. But what I don't know is where the line of acceptability is. Is it at +/- 4 degrees from the room w/ the thermostat, +/- 3 degrees, +/- 2 degrees +/- 1 degree?
Thanks in advance.