Residential · Kensington, CA
Kensington Ct, Kensington: two ducted heat pumps in the crawlspace (in progress)
Underway: two Mitsubishi ducted heat pumps on framed crawlspace platforms, one per floor, with custom sheet-metal plenums and new flex distribution, built with the general contractor.
This Kensington project, now underway with a repeat general contractor partner, replaces the existing equipment with two Mitsubishi ducted heat pumps: a 2-ton system and a 1.5-ton system, one for each floor. Both air handlers sit on framed platforms in the crawlspace and feed new R-8 flex runs from custom sheet-metal plenums. Asbestos abatement is part of the scope, and a shear wall forced us to reroute the line sets and ducting and relocate the outdoor units.
- Type
- Full-System Residential Retrofit
- Client
- General contractor-led project
- System
- Two Mitsubishi ducted heat pumps (2-ton and 1.5-ton), one per floor
- Location
- Kensington, CA
Scope
- — Removal of the existing equipment, with asbestos abatement in scope
- — Mitsubishi SVZ-AP24NL air handler with SUZ-AA24NL outdoor unit (2 tons)
- — Mitsubishi SVZ-AP18NL air handler with SUZ-AA18NL outdoor unit (1.5 tons)
- — Both air handlers on framed platforms in the crawlspace
- — Custom sheet-metal supply plenums and return filter boxes
- — 12 to 14 R-8 flex runs per system, supply registers, two return grilles and balancing dampers
- — About 50 ft of insulated line set per zone, condensate pumps, line-hide cover, disconnects and whips
- — Two programmable thermostats, one per floor
- — Change order: line set, ducting and rigid pipe rerouted around a shear wall; outdoor units relocated
- — Startup, commissioning and final balancing
Constraints
- — Asbestos abatement before the new work
- — Both air handlers in a crawlspace
- — A shear wall in the planned path forced a reroute and new outdoor unit locations
3rdGen's Role
3rdGen designed both systems and the duct layout, fabricates the plenums, installs and commissions the equipment, and coordinates the abatement and shear-wall reroute with the general contractor.
Outcome
In progress. When finished, each floor will have its own variable-speed heat pump and thermostat on new, balanced duct distribution.
Photography
