Is there any difference in meaning between these two sentences? Do don't have to and needn't mean the same?
I don't have to do the hoovering every day.
I needn't do the hoovering every day.
—used to say that something is necessary
▪ All you need do is ask. [=all you need to do is ask]
▪ You need only look at her [=it is only necessary for you to look at her] to understand why I fell in love.
—usually used in negative statements and in questions for which the answer is assumed by the speaker to be “no”
▪ You needn't leave if you don't want to. [=you don't have to leave if you don't want to]
▪ You need not answer these questions. [=you don't have to answer these questions]
▪ I told him he needn't worry.
▪ Nothing bad happened. You need not have worried.
▪ Need I point out that your father disagrees?