Residential · Corte Madera, CA · 2024
Blue Rock Ct, Corte Madera: two-zone ducted heat pump with ERV
A top-floor furnace removed and two Mitsubishi ducted heat pumps installed in the crawlspace, one per floor, with an ERV supplying fresh air to both.
This Corte Madera home had a furnace on the top floor. We removed it and installed two Mitsubishi 1.5-ton ducted heat pumps in the crawlspace, one for each floor, with new returns, new plenums and rerouted supply duct. A Panasonic ERV in the crawlspace now supplies fresh air to both zones. In 2026 the owner had us back to reroute and extend a return in rigid duct.
- Type
- Full-System Residential Retrofit
- Client
- Residential homeowner
- System
- Two Mitsubishi 1.5-ton ducted heat pumps with a Panasonic ERV
- Location
- Corte Madera, CA · 2024
Scope
- — Removed the top-floor furnace
- — Two Mitsubishi SVZ-KP18NA air handlers on unistrut with vibration pads in the crawlspace
- — Two SUZ-KA18NA2 outdoor units on wall mounts
- — New returns, including a 20x24 return for the lower floor, with 16 in R-8 flex to the return plenums
- — Supply and return plenums with damper take-offs; supply duct rerouted in R-8 flex
- — Panasonic FV-10VE2 ERV (100 CFM) in the crawlspace, ducted to both zones
- — MHK2 wireless thermostats, communication wiring, UV-jacketed line sets, breakers and fused disconnects
- — 2026 follow-up: return rerouted and extended in rigid duct at the owner's request
Constraints
- — All air handlers and the ERV fit into the crawlspace
- — Two floors served by separate zones
3rdGen's Role
3rdGen designed the two-zone layout and ventilation, installed both systems and the ERV, and returned in 2026 to rework a return.
Outcome
Each floor has its own heat pump and thermostat, and both get continuous fresh air from the ERV.
