Keeping a multi-story house cool using AC and attic fan?

[Martinjmpr]

Does your HVAC controller have a "circulate" function? If it does it should help keep the entire house the same temp.

By "controller" do you mean the thermostat? If so, I don't think it has such a setting.

Question: It does have both "on" and "auto" fan settings. If I set the fan to "on" would the AC unit (i.e. the chiller) run constantly or just the fan? Seems to me if I can set it to where the fan runs but the chiller only comes on when the temp drops below a certain level, that should help even out the temp in the house, right?

Then the next question is, is the fan a big power draw? I know the chiller is.

[Great-Kazoo]

By "controller" do you mean the thermostat? If so, I don't think it has such a setting.

Question: It does have both "on" and "auto" fan settings. If I set the fan to "on" would the AC unit (i.e. the chiller) run constantly or just the fan? Seems to me if I can set it to where the fan runs but the chiller only comes on when the temp drops below a certain level, that should help even out the temp in the house, right?

Then the next question is, is the fan a big power draw? I know the chiller is.

On is just the fan. Depending on age of unit it will draw some power, maybe more. Again depending on age. I suggest you install ceiling fans to move that air around, as well as install a return on the upper level. If it's too cost prohibitive, go with a mini - split.