Residential HVAC · Larkspur, CA
Residential HVAC in Larkspur, CA
Whole-home heat pumps, HVAC replacements, ducted systems, zoning, and remodel coordination for Larkspur homes and residential project teams.
Project photo
[ img ] Larkspur · residential design-build
2015
In business since
J · S · D
In-house Manual calcs
C-20 · C-36
CA Lic. 1086898
Local context
Heating & cooling designed for Larkspur
Larkspur has older homes, hillside properties, remodeled residences, and multi-level houses where existing ducts, zoning, outdoor placement, and construction coordination shape HVAC design.
Areas we often work in: Downtown Larkspur · Baltimore Canyon · Palm Hill · Hillview · Larkspur Marina · Greenbrae border
Marin County · permits pulled as part of full-system design-build scopes
Climate
A Bay-influenced climate
Larkspur combines marine influence with sunny hillside exposure. Heating, targeted cooling, quiet operation, and balanced room-by-room airflow matter more than rule-of-thumb equipment sizing.
Capabilities
Full-system HVAC for Larkspur homes
Remodels, whole-home replacements, heat pump conversions, and multi-zone comfort — planned with Manual J, S, and D where the project needs it.
Heat pump conversions
Gas-to-electric and high-efficiency heat pump upgrades sized for your home, with distribution and electrical needs planned up front.
Whole-home HVAC replacement
Full-system retrofits when ducts, equipment, zoning, or efficiency need a real redesign — not a same-size swap.
Ductless & multi-zone
Room-by-room comfort with ductless or ducted multi-zone layouts where the home needs flexible zoning.
Zoned comfort & VRF
Multi-zone ducted and ductless layouts, including VRF where larger or multi-level homes need quiet, flexible zoning.
Duct design & Manual D
Manual D–informed duct layouts so rooms get the airflow the load calculation calls for.
Indoor air quality & filtration
Upgraded filtration, sealed returns, and distribution strategies that help during wildfire smoke and allergy seasons.
Process
From first call to startup in Larkspur
01
Tell us about your home
Share location, timeline, plans if you have them, and what is not working today — or what your builder has scoped.
02
Size & design the system
We use Manual J, S, and D where the project needs it to match equipment, ducts, and zoning to the actual house.
03
Coordinate & install
Design-build field work with your GC or architect around access, finishes, sequencing, and clean rough-in.
04
Startup & handoff
System startup, basic orientation, and documentation so you know how the new system is meant to run.
Why 3rdGen
Built for whole-home projects in Larkspur
Design-build installs
Field execution by the team that sized and specified the system — before equipment is ordered.
In-house Manual J · S · D
Load, equipment, and duct decisions based on the home — not square-footage rules of thumb.
Licensed design-build
C-20 HVAC and C-36 Plumbing · CA Lic. 1086898 · in business since 2015.
Common Questions
Frequently asked in Larkspur
Can a heat pump replace a furnace in a Larkspur home?
Yes. We verify the home’s loads, ducts or ductless layout, electrical capacity, and equipment application before recommending the conversion.
Can you improve uneven temperatures between floors?
Often. Zoning, return-air paths, duct changes, and room-by-room loads are evaluated as part of a full-system design.
Do you take on HVAC scopes during remodels?
Yes. Remodels are a core project type, especially when equipment placement, duct routing, ventilation, and finish conditions need early coordination.
Do you install ductless mini-splits?
Yes, when ductless or a mixed system is the right fit for the home, zoning goals, and architecture.
Do you offer repair calls?
No. We focus on full-system replacement, heat-pump installation, remodel HVAC, and other project-based residential work.
Marin County · Service area
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