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The more I read the less I know... Before reading on this forum I'd turn the thermostat without a second thought.
My building has 3 zones. Some zones are only used 2 or 3 nights a week. When zones are not in use I have been turning the heat down to 50deg and when in use turning up to 68 never giving it a thought. Now I'm wondering if this is a problem and could shock the boiler.