Laws
No state laws dictate how much notice a landlord must give before entry. The only stipulations are that the notice be provided and that the landlord enters at a reasonable time.
Statute: § 540-A:3, IV-V
Bed Bugs
If the landlord receives a bed bug complaint in a rental property, they may enter the premises without notice within 72 hours to handle the situation. If there is a complaint from an adjacent rental unit, the landlord must give the tenant a 48-hour notice before entry.