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From: "CBhvac"

Cris, in many northern climates, especially where electricity is cheap and
electric baseboard more common, many homes use a low-voltage stat and relay to
control the electric heaters.

Reason being, there are no line voltage stats commonly available (Largest I've
seen is rated 22a @ 240v) that can accomodate more than a couple of baseboards
in the same large room, like a livingroom / diningroom / kitchen / foyer area.

Maybe in the Carolinas the footage of electric baseboards is is much lower, but
up here it's often times wall to wall baseboard, an no line volt stat can
control all that as a single zone.