When I visited my in-laws in GA and was offered iced tea, I tried it to be polite.
OMG!! How can you drink that stuff!
You have to mix in the sugar when it is still hot, then mix it with more water. I cant drink the stuff that is brewed, iced and then sugar added. That isn't iced tea, that is cold tea in ice with sugar added.
Anywhere around here any place that wants to sell any tea, brews and adds sugar while it is still hot A lot of places put so much sugar in the sweet tea it is undrinkable to me. They all also brew iced tea with no sugar. When out I have to order it by saying "iced tea half and half" , that means to mix the brewed sweetened tea with brewed unsweetened tea.At home I mix maybe a third of a cup of sugar in the hot brewed tea, enough to make a gallon of iced tea. Restaurants around here use MUCH more.
http://en.wikipedia.org/wiki/Sweet_tea
I stopped at a place to eat while driving thru Georgia and they just served iced tea and you had to add your own sugar, not sure if it is like that everywhere but that is a very big no no. It was some chain so I am not sure how it is in the privately owned and mom and pop places down there. If you get it made right it is good, if not it is pretty bad. There are only certain areas of the US that sweeten it hot while brewing it. The rest of the country has no idea what good iced tea is.

It is an art and one that you may have to adjust to taste, even when not at home. I also only use Luzianne brand tea bags. It can be made with a couple of others brands too but it isn't quite as good.