; (ii) in-unit energy efficiency product upgrades, including upgrading to— (I) modern, energy-efficient insulation; (II) all-electric state-of-the-art efficient appliances; (III) energy-efficient bathroom plumbing, including low-flow toilets; (IV) energy-efficient laundry machines; (V) energy-efficient air filters; (VI) energy monitoring devices including smart meters and smart thermostats; (VII) energy-efficient lightbulbs; (VIII) highly insulated windows; (IX) reflective roofing; and (X) smart Supervisory Control and Data Acquisition systems and building-to-grid integration; (iii) infrastructure related to building electrification, including the upgrade of— (I) electric heating, ventilation, and air conditioning systems, including cold-climate heat pumps; (II) electrical panels; and (III) electric appliances to replace appliances reliant on fossil fuels, such as gas stoves and hot water heaters; and (iv) water quality upgrades, including the replacement of water pipes in public housing if a quality test of drinking water concentrations in public housing exceeds— (I) 3.1 parts per billion of lead; (II) 20 parts per trillion combined of the 5 perfluoroalkyl and polyfluoroalkyl substances, which are— (aa) perfluorooctanoic acid; (bb) perfluorooctane sulfonate; (cc) perfluorohexane sulfonic acid; (dd) perfluoroheptanoic acid; and (ee) perfluorononanoic acid; (III) 0.010 mg/L of arsenic; (IV) 1.3 mg/L of copper; (V) drinking water standards of the Environmental Protection Agency for organic and inorganic contaminants, radionuclides, and microbiological contaminants