(b) In order to implement energy conservation measures under this section, the tenant or entity administering any energy conservation or weatherization program shall give written notice of the intent to implement such measures to the landlord by certified mail, return receipt requested. Unless the landlord gives written notice of his disapproval of such implementation by certified mail, return receipt requested, within twenty days of the giving of notice to him, such energy conservation measures may be implemented, provided that, to the extent his consent would otherwise be necessary, no such disapproval shall be effective as to the installation of removable weatherstripping around doors and windows, removable interior storm windows and insulation wrap around hot water heating tanks.