Where in Marin County do you take on projects?
We evaluate projects across Mill Valley, Larkspur, Sausalito, Tiburon, San Rafael, Novato, and surrounding Marin communities based on scope and fit.
Residential HVAC · Marin County, CA
Residential HVAC in Marin County
Whole-home heat pumps, HVAC replacements, ducted systems, remodels, and high-end residential mechanical work across Marin County—designed around the home and coordinated through commissioning.
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- 5.0 ★ Homeowner Rating
- Mitsubishi Electric Diamond Contractor
- Marin County Residential Projects
- Design Through Commissioning
Local conditions
Marin homes require site-specific HVAC planning.
Hillside access, marine exposure, dense neighborhoods, wooded lots, and design-sensitive interiors all affect equipment location, sound, distribution, and construction sequencing.
We calculate the load, evaluate the distribution, confirm electrical capacity, and coordinate routing before equipment is ordered.
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Hillside and limited access
Equipment delivery, service clearances, drainage, and line-set routing are planned around the actual site.
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Quiet outdoor equipment
Sound and neighboring properties are considered during equipment selection and placement.
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Design-sensitive interiors
Ducts, grilles, indoor units, and access points are coordinated with architecture and finishes.
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Marine air and inland heat
Manual J sizing accounts for exposure and microclimate instead of relying on countywide rules of thumb.
Project fit
Residential HVAC projects we handle in Marin County
We take on substantial Marin residential work: whole-home replacements, heat-pump conversions, remodels, new construction, and coordinated HVAC scopes.
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Whole-home heat pump replacement Complete upgrade
Heating and cooling replacement designed around the home, ducts, zoning, electrical capacity, and comfort goals.
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Ducted heat pump systems Central
Central systems sized by load with duct condition, static pressure, return air, and room airflow reviewed.
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Ductless + mixed systems Flexible zoning
For homes where architecture, additions, zoning, or limited routing favor ductless or mixed distribution.
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Furnace-to-heat-pump conversions Gas to electric
Electrification coordinated with distribution, controls, electrical scope, permits, and equipment placement.
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Remodels + additions Coordinated
HVAC coordinated with architectural plans, framing, finishes, other trades, and the construction schedule.
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New and custom homes From the plans
Manual J/S/D, equipment selection, ventilation, routing, and installation planned before rough-in.
Homeowner reviews
Trusted by Bay Area Homeowners
5.0
5 out of 5 stars from 207 Google 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
Designed before it is installed
The home, site, project team, and finish requirements are resolved before installation begins.
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Review the home and project
We start with the building, plans, existing system, comfort issues, site access, and project goals.
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Calculate and evaluate
Loads, ducts, electrical capacity, equipment locations, sound, drainage, and routing are checked.
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Design the complete system
Equipment, distribution, zoning, controls, ventilation, and construction coordination are resolved.
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Install and commission
The planned scope is installed, started, tested, documented, and handed off as one system.
Marin project experience
Whole-home HVAC planned with the build
A Mill Valley new-construction project required heating, cooling, and indoor air quality to be coordinated before finish work. The whole-home heat-pump system was planned with the construction schedule rather than added after the layout was fixed.
Verified project profile
- Location
- Mill Valley, Marin
- Project
- New-construction HVAC
- System
- Whole-home heat pump with indoor air quality
Cost
What a heat pump project costs, and what moves the number
Based on recent 3rdGen projects, most residential heat pump installations fall within the ranges below. Final pricing is determined after we evaluate the building, calculate the load and confirm the ductwork, electrical and equipment requirements.
Scope Typical 3rdGen Project Range What drives it
Ducted heat pump, existing ducts usable $20k–$30k Equipment tier, capacity, controls, condenser location and access
Ducted heat pump + duct repair or resizing $25k–$45k Amount of ductwork replaced, crawlspace or attic access, return-air changes
Ductless multi-zone, 3–4 heads $25k–$40k Head type, line-set length, routing, concealment and finish conditions
Whole-home ducted + ductless combination $40k–$80k+ Multiple systems, zoning, ductwork, filtration, ventilation and architectural coordination
New construction system $20k–$50k+ Building size, system count, Title 24/design requirements and coordination with the build
ADU system $8k–$15k Zone count, head type, line-set routing, and whether the ADU shares the main house or stands alone
Electrical panel upgrade, when required $8k–$10k+ Service size, meter location, utility requirements and site conditions
Complex whole-home and design-build projects can exceed these ranges. Rebates and incentives may reduce your net project cost.
Project inquiry
Tell us about your Marin County HVAC project
Share your ZIP, the home, plans if you have them, and your timeline. A project lead reviews the scope and follows up.
Project Inquiry
Inquiry Sent
Thanks — your project details are on their way to 3rdGen. We’ll review them and follow up about the next step.
Project teams
Already have an architect or contractor?
Good.
We work directly with Marin homeowners and within architect- and GC-led project teams.
What coordination covers
- Equipment locations, chases, framing, and finish-sensitive routing
- Electrical capacity, controls, drainage, and construction sequencing
- Mechanical drawings, permit documentation, rough-in, and inspections
- Installation, startup, commissioning, and homeowner handoff
Mitsubishi Electric
Proud Mitsubishi Electric Diamond Contractor
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
12-year warranty
Extended parts & compressor coverage on qualifying Diamond installations.
Factory-trained crews
Ongoing manufacturer training on the latest hyper-heat systems.
Priority support
Direct factory escalation if anything ever needs attention.
FAQ
Common Questions
Straight answers about heat pumps, whole-home HVAC, remodel coordination, and project delivery in Marin County.
Are heat pumps a good fit for Marin homes?
Yes. Properly selected heat pumps work well across Marin when Manual J sizing accounts for marine exposure, hillside conditions, envelope performance, and the home’s actual loads.
Do you handle ducted and ductless systems?
Yes. We design ducted, ductless, and mixed systems according to the home, routing constraints, zoning goals, and architectural priorities.
Can you coordinate with our architect or general contractor?
Yes. Remodels and custom homes are a core fit. We coordinate equipment, routing, electrical needs, rough-in, finishes, startup, and commissioning with the project team.
Do you provide repair or maintenance service?
No. We focus on project-based residential HVAC: replacements, heat-pump conversions, remodels, new construction, and substantial system upgrades.