House Wrens live in all of North America and the Carolina Wrens are very popular from Mid to Eastern USA. They both require a 1 1/4 inch hole in their nesting house. They are a very sociable bird. The male will sing for weeks trying to attract a female to the house he’s picked out for them. Ours comes back from the end of April until mid May to the wren house we have on a grape vine post just 5 foot from the edge of our deck, facing our house. The whole family puts on quite a show the entire time they are nesting. Truly a JOY! They nest through July. Their house should be at least 6 ft off the ground and a floor space of 4″x4″, but they can squeeze in to a smaller space.