I also work in a factory but our temperature is largely unregulated with the exception of offices, break areas and certain departments where the stock needs to be kept away from too much humidity (so, even in those departments it’s humidity control not air conditioning). In the winter it’s cold enough that we’ve had pipes freeze in the center of the building and in the summer it’s normal to see 100 degrees at 3am. It’s too bad I don’t live in one of those states where it’s “regulated” because I think anyone would say those temperatures are unreasonable.