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COMPARISON TABLES FOR RETROFIT PROJECT TYPES Table 2. Heat Pump Technologies – Major Considerations Retrofit Project Major Considerations 1. Central AWHPs Existing hydronic distribution systems have a long life expectancy and can be paired with new central heat pump plants as needed, reducing the burden of future upgrades as technology and regulation evolves. 2. Ground loop + WSHPs Ground loops introduce additional cost and complexity compared to air source alternatives. 3. Central to PTHPs Best for mild climates until cold-climate performance improves, removes the potential for distribution waste in space heating systems and removes split incentive of energy cost vs energy use if tenants pay for the electricity. 4. VRF Capital costs can’t typically be justified by utility savings unless the heating and cooling distribution systems need to be completely redone; comfort and amenity benefits could create other cost recoupment 5. Mini splits The much wider variety of contractors capable of installing this equipment compared to more complex central system improves choice in the market and also may make training especially important. 6. Furnace to mini splits The much wider variety of contractors capable of installing this equipment compared to more complex central system improves choice in the market and also may make training especially important. 7. PTAC to PTHP Best for mild climates until cold-climate performance improves. Requires 230V electricity service at the exterior walls for the PTHPs (available if a gas PTAC is used). 8. Central AWHP DHW CO2-refrigerant units are available globally and increasingly available in the US. Unlike other heat pump applications, this retrofit can be completed with no disturbance to tenant spaces. 9. Unitized HPWH DHW CO2-refrigerant units are available globally and increasingly available in the US. Steven Winter Associates,Inc. 44PDF Image | HEAT PUMP RETROFIT STRATEGIES FOR MULTIFAMILY BUILDINGS
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