Residential · Piedmont, CA · 2026
Hazel Ln, Piedmont: 3-ton ducted heat pump after asbestos abatement
Asbestos duct boots and attic insulation abated, then a new Mitsubishi 3-ton ducted heat pump and insulated duct distribution for the upper level of a Piedmont home.
The upper level of this Piedmont home had duct boots and attic pipe insulation that tested positive for asbestos. We managed the abatement first, then fabricated 12 new sheet-metal boots and a new insulated duct system that ties into the existing wall chases. A Mitsubishi 3-ton ducted heat pump now heats and cools the floor.
- Type
- Full-System Residential Retrofit
- Client
- General contractor-led project
- System
- Mitsubishi 3-ton ducted heat pump with new duct distribution
- Location
- Piedmont, CA · 2026
Scope
- — Asbestos abatement of duct boots and attic thermal system insulation, managed by 3rdGen
- — Mitsubishi SUZ-AA36NL 3-ton outdoor unit and SVZ-AP36NL multi-position air handler
- — New insulated supply trunk, branch ducts, return connections and balancing dampers
- — 12 fabricated sheet-metal duct boots with insulation, ceiling register boxes and registers
- — Refrigerant piping, communication wiring, condensate drain with P-trap and float switch
- — Equipment pad, disconnect and whip
- — Airflow balancing, startup and commissioning
Constraints
- — Asbestos-containing boots and attic insulation had to be abated before any duct work
- — New ducts had to connect to existing vertical wall chases
- — Final inspection needed the system powered on
3rdGen's Role
3rdGen managed the abatement, designed and fabricated the new duct distribution, installed and balanced the heat pump, and handled inspections with the general contractor. Rough inspection passed.
Outcome
The upper level has a clean, sealed duct system with no asbestos and a variable-speed heat pump for heating and cooling. Rough inspection passed.
Photography
