[masraum]

Originally Posted by Typ616

If the whole house was like downstairs I wouldn't notice, but going up/down it's more obvious. Not sure what a bad humidity level is, real world: 60%? 70%?

We lived in a 2 story house built in 1967. During the summer months the upstairs/downstairs temp differential would be uncomfortably large, and would overwhelm the AC in the house. In the spring and fall, sometimes the downstairs would stay cool enough to not kick the AC on all day but the upstairs would be several degrees warmer than the downstairs making it very uncomfortable. For a couple of years, I would just kick the fan to "on". Having a circulate mode made a huge difference. You could still feel a difference between the upstairs and downstairs, but the difference was much smaller and liveable. I found that running the fan 24x7 wasn't as expensive as you would think, but of course, having a circulate mode is even better.