APPENDIX III TO PART 456-MULTIFAMILY APPLICABILITY CRITERIA AND PROCEDURES FOR DETERMINING USAGE CUTOFF LEVELS

(a) General. (1) For those program measures identified in Appendix I, a State or nonregulated utility has the following options regarding audits for dwelling units in residential buildings containing more than four dwelling units (multifamily dwelling units):

(i) Accept the measures indicated by Appendix I for use in multifamily dwelling units.

(ii) Use the DOE multifamily applicability criteria and/or procedures for determining specific cutoffs for heating energy use, cooling energy use, or domestic hot water use in paragraphs (b), (c), (d), and (e) of this appendix for all or some of the program measures identified in Appendix I.

(iii) Develop a method for determining applicability and submit it to DOE for approval in accordance with § 456.306(b).

(2) DOE has not developed multifamily applicability criteria or methods for determining usage cutoff levels for caulking, weatherstripping, duct and pipe insulation, storm or thermal windows, heat reflective and heat absorbing window materials, and IID's. DOE has determined that these measures have the same applicability in multifamily dwelling units as in the prototypical house.

(3) DOE has developed specific applicability criteria for ceiling insulation, floor insulation, wall insulation, clock thermostats, storm or thermal doors, water heater insulation, solar domestic water heaters, replacement solar swimming pool heaters, combined active solar space heating and solar domestic hot water systems, wind energy devices, direct gain systems, window heat gain retardants, window heat loss retardants, solaria/sunspace systems and indirect gain systems.

(4) In addition to the applicability criteria, methods for determining usage cutoff levels have been developed for replacement furnaces or boilers, replacement oil burners, flue dampers, replacement central air-conditioners, solar domestic water heaters, active solar space heating systems and combined active solar space heating and solar domestic hot water systems because they may have significantly different simple paybacks for multifamily dwelling units than for the single family prototypical house. The payback for these measures is dependent on heating energy use, cooling energy use, or hot water use. An audit for each of these measures is required if the annual energy usage or hot water usage in a multifamily dwelling unit is high enough such that a 7

year payback is probable. That level of usage for which a 7-year payback is probable is the cutoff level for that measure.

(b) Applicability criteria. (1) Ceiling Insulation. Ceiling insulation is applicable when the audit is for ceilings separating a conditioned space from an unconditioned space and when it is physically practical to insulate the ceiling.

(2) Floor Insulation. Floor insulation is applicable for floors separating a conditioned space from an unconditioned space and when it is physically practical to insulate the floor.

(3) Wall Insulation. Wall insulation is applicable for walls separating a conditioned space from an unconditioned space and when it is physically practical to insulate the walls.

(4) Storm or Thermal Doors. A storm or thermal door is applicable if the door separates a conditioned space from an unconditioned space.

(5) Clock Thermostats. A clock thermostat is applicable when the thermostat is not part of the furnace.

(6) Water Heater Insulation. Water heater insulation is applicable when there is an individual water heater for that multifamily dwelling unit.

(7) Solar Domestic Water Heaters. A solar domestic water heater is applicable when there is an individual water heater for that multifamily dwelling unit. This measure may also be subject to a hot water usage cutoff.

(8) Combined Active Solar Space Heating and Solar Domestic Hot Water Systems. A combined active solar space heating and solar domestic hot water system is applicable when there is an individual water heater for that multifamily dwelling unit. This measure may also be subject to a hot water usage cutoff.

(9) Wind Energy Devices. A wind energy device is not applicable for multifamily dwelling units.

(10) Replacement Solar Swimming Pool Heaters. A replacement solar swimming pool heater is not applicable for multifamily dwelling units.

(11) Direct Gain Systems. A direct gain systems is applicable when the living area has either a south-facing (+ or -45° of true south) or an integral south-facing (+ or-45° of true south) roof with tilt angle measured from the horizontal greater than the local latitude that is free from major obstruction to solar radiation.

(12) Window Heat Gain Retardants. A window heat gain retardant is applicable when the living area has a window that is not shaded from summer sunshine and the residence has substantial use of energy for air conditioning.