N.H. Rev. Stat. Ann. § 477:13

If the grantor or lessor shall refuse to acknowledge a deed or lease, proof of its due execution may be made in the manner provided in RSA 477:12, but, if the grantor or lessor is a resident of this state, notice of the time and place of proving the same, signed by a justice, shall be delivered to him or left at his abode 14 days prior to such time. Every unacknowledged deed proved agreeably to this section or RSA 477:12 shall be as effectual as if duly acknowledged.