N.H. Rev. Stat. Ann. § 540:13-b
Unless the court finds that the act of the tenant in making a report or complaint or in initiating an action or in organizing relative to alleged violations by a landlord was primarily intended to prevent any eviction, a rebuttable presumption that such possessory action was in retaliation of the tenant's action shall be created when any possessory action, increase in rent or any substantial alteration in the terms of the tenancy is instituted by a landlord within 6 months after:
I. The landlord received notice of any such alleged violation provided that:
Source. 1972, 26:1. 1979, 305:4. 1985, 249:5, eff. Aug. 6, 1985.