There's the expense of maintaining a central A/C, ductwork, etc., that I'd rather not deal with (not to mention electricity is expensive here). Yes, if the air

There's the expense of maintaining a central A/C, ductwork, etc., that I'd rather not deal with (not to mention electricity is expensive here). Yes, if the air outside is dirty (forest fires, volcanic eruption, etc.) you've got a point. HEPA filters can help some with this, I suppose. Humidity isn't usually a big issue here most days. If anything, it can be a bit dry (but not as dry as running an A/C would make it). Though, I do have a portable dehumidifier I use when I need to :)