According to Harvard, this is already 1984. The summer hiatus is the Unitarian's revolt against the Calvinist work ethic. Actually, closing for the summer is a Universalist tradition. It was a concession made by the Unitarians at the time of the merger in 1961. We close for the summer to save energy.
Closing is ecologically sound.
Unitarians are really closet Episcopalians. We've always done it this way. Hearing that a great flood was coming Roman Catholics said their rosaries, Methodists joined in prayer, but UU's formed a class to try to learn to live under water. None, we accept the light bulb the way it is. None, we appoint a committee to raise funds to pay the electric bill.