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APPENDIX A: COST ESTIMATES Common Assumptions Value Units Source data and notes Average rooms per apartment 2.5 Design heat load of an 12,000 apartment, assuming EE measures undertaken Distribution work to optimize $1.2 system Total Cost $1.8 Cost of hot water piping and $10 pumps if new to building Comprehensive controls and 0.3 balancing, hydronic Cost of central heat pump plant, $4 total Total, starting point 1: non- $15 hydronic system Total, starting point 2: hydronic $5 system Cost of each heat pump $4,000 Apartment interior work per $500 WSHP Cost of condenser piping and $10 pumps Costof230Velectricalserviceto $7 exterior wall Total cost $29 BTU/hr per SF per SF per SF per SF per SF per SF per SF per heater per heater $/SF perSF per SF 1 heater per room For generic equipment sizing TWG page 64 TWG page 63 TWG page 63 Average floor area per apartment, including common areas 1,000 SF TWG link: http://www.nyc.gov/html/gbee/dow nloads/pdf/TWGreport_2ndEdition_ sm.pdf Baseline/BAU: Steam or Hot water boiler replacement Value Units Source data New, optimal boiler plant $0.58 per SF TWG page 55 (average of "Right size steam boilers at end of life" and "Replace atmospheric boilers with sealed combustion boilers" Central Heat Pumps with Hydronic Distribution Value Units Source data Passive room heaters to allow low temps, including hardware and software controls $300 each heater source: https://www.houseneeds.com/heati ng/hydronic-radiators/myson- radiator-baseboard-t6-ivc-t622-4- 10 Ground loop with WSHPs Value Units Source data Cost of vertical well $1,000 per 12,000 BTU source: https://www.oit.edu/docs/default- source/geoheat-center- documents/publications/heat- pump/tp38.pdf?sfvrsn=2 TWG page 63 Steven Winter Associates,Inc. 46PDF Image | HEAT PUMP RETROFIT STRATEGIES FOR MULTIFAMILY BUILDINGS
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