I have a two story house, 30 years old. Temperature upstairs is five or six degrees hotter in summer than downstairs.
I understand that I can not zone the vents in this house. Would a variable speed A/C help? If the temperature downstairs is below the thermostat setting, can I get the fan to come on to cool the upstairs?
Would an attic fan against the gable help in addition to a turbine fan?