I have to agree that daily contact may be too much for you. You don't get any space. Your AH is trying to work his way home. Could the children visit him where he is staying?
You really don't have the opportunity to detach with him and the expectation of him around your house everyday.
Plus, have you considered that your kids may be getting the wrong message about what's to come? Remember that in alcoholism "good deeds" like shoveling snow don't equate to recovery, even thoughhe wants it to.
I say this with great sympathy for your situation.