Residential HVAC · Larkspur, CA
Whole-home heat pump systems for Larkspur remodels, retrofits, and substantial HVAC replacements — designed around existing homes, architecture, equipment access, duct routing, and the finished project.
Remodels · Retrofits · Heat Pumps · Multi-Zone Systems
Project Inquiry
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Project fit
Whole-home heat pump retrofits, remodel mechanical scopes, ducted and concealed systems, multi-zone equipment, ventilation, and residential projects where modern HVAC needs to be integrated carefully into an existing home.
New system
New ducted or ductless heat pump systems sized for your home, comfort goals, and how the house is built.
Heat pump installationFull upgrade
Replace aging furnace and AC together, or convert gas heat to a heat pump with ducts, electrical scope, and controls planned as one job.
Replacement & conversionCentral
Central heating and cooling through existing or updated ductwork, with loads and airflow checked before equipment is selected.
Ducted heat pumpsRoom-by-room
Mini-splits and multi-zone layouts when zoning, architecture, or tight routing make ductless or mixed systems the better fit.
Ductless & multi-zoneCoordinated
Mechanical design and rough-in coordinated with your architect or builder while walls and ceilings are still open.
HVAC for remodelsFresh air
ERV/HRV, filtration, and balanced ventilation coordinated with your heating and cooling scope when the project needs it.
Ventilation & IAQRelevant Marin work
High-end residential remodel
A representative Marin residential project showing the mechanical planning, equipment coordination, routing, and finish-aware execution we bring to Larkspur homes.
The six-zone Fujitsu ductless system was installed, permitted, inspected, and completed as part of the home’s remodel-for-sale scope — delivering zoned heating and cooling without a conventional ducted retrofit.
Representative published remodel scope — location, photos, and full details on the project page.
View projectBuilt around the house
Larkspur includes an established stock of older homes, hillside properties, and residential architecture where duct routes, equipment locations, access, and visible mechanical elements may be constrained by the building itself. In those homes, the system has to be designed around what the property can support.
3rdGen evaluates load, distribution, zoning, duct paths, equipment locations, ventilation, electrical requirements, access, and serviceability before finalizing the mechanical approach.
Larkspur's own historical material documents early hillside homes reached by steps and paths, while City housing documents describe an established housing stock and longstanding architectural heritage.
Original framing, limited mechanical space, previous renovations, and existing duct systems can all affect how a modern heat pump is integrated.
Where the property includes slopes, stairs, or constrained access, equipment locations and installation planning deserve attention early.
Central ducted and concealed fan-coil systems can help integrate heating and cooling with the architecture where visible wall equipment is not preferred.
During a remodel, early HVAC planning can protect ceiling space, finish details, duct paths, equipment access, and serviceability.
Homeowner reviews
207 Google reviews
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Mitsubishi mini-split installed with outstanding care. Indoor and outdoor units done right. High efficiency meant a meaningful federal tax credit too.
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Devin and his crew did a fantastic job installing AC for our whole house. High quality Mitsubishi equipment and a clean installation throughout.
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Devin is meticulous, methodical, and knowledgeable. Professional crew and a heat pump install we trust completely.
Photos from the installs above
Read all 207 reviewsHow we work
On many Larkspur projects, the important decisions happen around the home, the existing system, and the distribution — not from copying the equipment that came out.
Plans, goals, existing system, remodeling scope, and known constraints.
Manual J / system sizing where appropriate, zoning strategy, equipment selection, and distribution.
Indoor equipment, outdoor equipment, duct / refrigerant routing, ventilation, access, and serviceability.
Equipment locations, GC/architect coordination, and permit requirements where they apply.
Rough-in and finish installation coordinated around the project.
Startup, controls, commissioning checks, inspection coordination, and homeowner handoff.
Complete project delivery
A Larkspur electrification project can touch the furnace, ducts, electrical service, controls, equipment locations, permits, and finished interiors. We plan those connections as one scope.
The result is a complete system designed for the home, installed to the plan, and tested before handoff.
Tell us about the projectRemoval and replacement planned around the complete conversion.
Reused, modified, or replaced according to what the design requires.
Capacity, circuits, documentation, inspections, and other trades coordinated with the HVAC scope.
Operation and airflow checked before the project is handed back to you.
Cost
On a Larkspur retrofit, existing construction can have as much impact on scope as the equipment itself. Duct condition, concealed-system requirements, number of zones, access, electrical scope, routing, outdoor-unit placement, ventilation, and remodel conditions all affect the finished project.
Complex whole-home and design-build projects can exceed these ranges. Rebates and incentives may reduce your net project cost.
Project inquiry
Planning a whole-home heat pump, remodel, major HVAC replacement, or concealed multi-zone system? Send us the home, existing system, project goals, timeline, and plans if available.
Project Inquiry
Thanks — your project details are on their way to 3rdGen. We’ll review them and follow up about the next step.
Project teams
On design-sensitive remodels, mechanical decisions can affect ceilings, cabinetry, framing, exterior equipment, access, and the overall architectural plan. Early coordination helps resolve those details while the design can still accommodate the system properly.
We work within existing project teams in Larkspur and across Marin — or directly with homeowners when that is the right path.
Mechanical systems coordinated around architecture, ceiling conditions, equipment locations, routing, and finish requirements.
Explore HVAC for architectsClear scope, scheduling, rough-in coordination, submittals, inspections, startup, and project handoff.
Explore HVAC for builders & GCsField execution, equipment selection, controls coordination, submittals, installation, and commissioning aligned with the mechanical design.
Explore engineering coordinationAlready assembling your own project team? We can take ownership of the mechanical scope and coordinate directly with the other professionals involved.
Start a residential projectMitsubishi Electric
As a Mitsubishi Electric Diamond Contractor, we design and install ducted, ductless, and multi-zone systems for Bay Area homes, with factory-trained crews and longer warranty options on qualifying residential installs.
Mitsubishi is not automatically the answer to every home. We start with what the project requires and recommend the system that makes sense.
12 Year Parts &
Compressor Warranty
Extended parts & compressor coverage on qualifying Diamond installations.
Ongoing manufacturer training on the latest hyper-heat systems.
Direct factory escalation if anything ever needs attention.
FAQ
Straight answers on heat pumps, retrofits, and existing-home HVAC scope in Larkspur.
Yes. Older homes can be strong candidates for heat pumps, but duct paths, electrical conditions, equipment access, existing distribution, and the architecture should be considered during system design.
Potentially. Depending on the available space, a project may use central ducted equipment, concealed fan coils, or a combination of system types.
Sometimes. We evaluate sizing, condition, leakage, airflow, returns, and whether the existing layout supports the new equipment before recommending reuse.
Larkspur's building submittal guidance states that HVAC sizing calculations are required for new HVAC systems, and California Energy Code documentation applies to conditioned remodel or addition work as applicable.
Yes. Remodel and architect-led work is a strong fit for 3rdGen because it allows equipment placement, distribution, routes, and access to be coordinated with the rest of the project before construction is locked in.
Project Inquiry
Thanks — your project details are on their way to 3rdGen. We’ll review them and follow up about the next step.
