Indio Mandarinquats aren't considered that great--They get considered because they are the among the hardiest of the real citrus (including Fortunella), and are meant for fairly cold yards near 8A zones. In a pot, you can just as easily consider a Sunquat (which sort of the same, FortunellaXMeyer [lemon, mandarin]), which should be a better fruit, if edibility is what you're after. All the same, though, if you're growing in pots, it's better to have real Fortunella, a Nagami or Meiwa. Most of these guys don't offer all that much of an advantage other than being more cold hardy than preferable alternative, specifically limes. Should be understood that Tavarres limequat is probably a lemonquat in actuality. Calamondins are pretty good, though.
Calvin, most everything subtropical hates dry air. It's been theorized that the reason many ultratropicals die in Florida is really because of *dry* and cold air, and not just cold. Citrus are relatively tolerant, so you probably have some *very* dry conditions. Humidifier?
Here in Atlanta, I've kept alive one Meyer lemon for four years now, and I think that with some forward thinking and a prep (making a frame and wrapping frost blankets around, with a small heater) will allow people here to grow true citrus without that much trouble. We stay nice and cold, unlike certain Gulf Coast climes with long warm winter spells, so that extra-sensitive citrus do not come out of dormancy (especially on trifoliate stock), and most of the time, shocks of truly cold weather is very short. So it amounts to keeping track of the weather, easy to do with a custom app, and walking out and slapping your stuff (and plug it in for cold under 20 degrees) over it for a few days. Don't get anything too sensitive to cold, but plenty of citrus do have 9a hardiness, and an early enough season to give fruit, that it's possible to be reasonably successful. And of course, satsumas with age and size to them probably will be hardy with relatively little attention and need no heating at all except on the very coldest of days.
Of course, you can forget all that care and go for the most edible of the trifoliate stuff, Dunstan, Thomasville, maybe some citranges. I know I *like* the taste of citrange-ade made with Troyer citranges. That citrange tastes like a very sour Ugly fruit, along with its dose of citrange caustic oil. Suitably diluted, the burn is minimized (and for me, deepens the taste), and the drink quite refreshing.