You must give the renter reasonable notice (usually 24 hours, though longer is better) for any non-emergency entrances (e.g. for  showing to perspective tenants). It's best to put the notice in writing, ideally in some way you can prove delivery--email w/receipt, faxes, etc. You also can only go in at reasonable times (e.g. 9 - 5) and not too often (e.g. not a  prospective tenant or two a day, for a week solid).However, if you comply with all that, the tenant cannot demand that he or she be home. They can be there for the showing, if they like; and they can certainly work with you to schedule it for when they are around; but they have no absolute right to require that they be present. Note that if anything is stolen or damaged, though, you would be liable.