My Orinda home has exposed beams and no attic. Can it still have central air?
Often not in the usual way. We may route ducts under the floor, use soffits where they exist or combine a small ducted system with ductless heads for the rest.
Residential HVAC · Orinda, CA
Residential HVAC & Heat Pumps in Orinda, CA
Orinda homes sit among trees, slopes and open-beam ceilings. We design heat pump systems that fit that reality, from a ductless layout for a mid-century post-and-beam to a zoned system for a multi-level hillside house.
Remodels · Retrofits · Heat Pumps · Multi-Zone Systems
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- 5.0 Google Rating 5.0 out of 5 stars
- Mitsubishi Electric Diamond Contractor
- C-20 + C-36 Licensed & Bonded
- Serving the Bay Area since 2015
Project fit
Projects we take on in Orinda
Six scopes that cover most Orinda requests, from furnace conversions to detached guest houses and smoke-ready air quality.
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No-duct fit
Ductless systems for open-beam ceilings
Where beams and vaulted ceilings leave no room for ducts, slim wall or ceiling heads deliver heating and cooling without cutting into the architecture.
Ductless heat pumps -
Conversion
Furnace and AC replacement with a heat pump
We replace aging gas furnaces and condensers, cap gas, add electrical and size the new system from a real load calculation.
Replacement & conversion -
Multi-zone
Zoned systems for multi-level hillside homes
Daylight basements and split levels run at different temperatures. We separate them into zones so the lower floor does not run cold while upstairs overheats.
Multi-zone design -
Ducted
Ducted systems where the crawlspace allows
Some Orinda homes have room for under-floor or attic ducts. We inspect them, design the layout with Manual D and size returns correctly.
Ducted heat pumps -
ADU
Guest houses and above-garage suites
A small detached unit has its own load. We size a compact heat pump to it, instead of extending the main house system.
ADU HVAC -
Clean air
Wildfire-smoke filtration and ventilation
Higher-grade filters, sealed returns and ERV options for Orinda homes that need cleaner indoor air in smoke season.
Ventilation & IAQ
Related multi-zone work
Whole-home heat pump remodel
View project →
High-end residential remodel
Hearst Remodel
This Berkeley project used a multi-zone ductless layout with refrigerant routing and wall-mounted outdoor units, the same approach we consider for Orinda houses where ducts will not fit.
- Home type
- Existing home, remodel for sale
- System
- Fujitsu multi-zone ductless heat pump
- Mechanical scope
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- · Six indoor wall units
- · Two outdoor units
- · Wall-mounted outdoor brackets
- · Refrigerant routing and field coordination
Challenge
- Existing older home with limited equipment placement options
- Outdoor units required side-yard wall bracket mounting
- Finish-sensitive interior installation
- Coordination with the general contractor’s remodel schedule
3RDGEN scope
- Six-zone ductless heat pump installation
- GC-led remodel coordination
- Permit and inspection support
- Startup as part of the completed remodel scope
Outcome
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 projectLocal projects
Heat pump & HVAC installs for Orinda homes
Recent installs by the 3rdGen crew that serves Orinda: ducted and ductless heat pumps, air handlers and ductwork.
Designed around the trees and the terrain
In Orinda, getting the equipment to the house is part of the design
Narrow roads, steep driveways and long stair runs affect what size equipment can be carried in and where it can sit. We note those details at the first visit, not after the quote.
Orinda’s mid-century stock was built for views, so there is a lot of glass and not much attic. That raises loads and limits duct options. We calculate with Manual J, choose equipment with Manual S at Orinda’s 29°F and 90°F design points and test duct paths with Manual D.
Tree cover, leaf litter and wildfire smoke shape the filter and outdoor unit choices too. We put those on the list before equipment is chosen.
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Steep access
Long stairs and narrow driveways limit equipment size and delivery method. We plan routes before we order.
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Open ceilings and exposed beams
Few chases and tall rooms favor ductless or low-profile solutions, with ducts only where they can be hidden.
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Large glass areas
Window walls drive both heating and cooling loads. We calculate by orientation so the system is not oversized.
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Trees and debris
Outdoor units need airflow clearance and protection from falling leaves and branches, which affects pad location.
HVAC design in Orinda
Orinda is wooded, steep and tight on access, and the HVAC plan has to start there
Most Orinda homes sit among oaks and redwoods on winding streets, often with the garage at street level and living space above. Before we pick a heat pump, we look at the driveway, the stairs to the equipment space and the crawlspace, because those decide what can be installed and how.
Design climate · Title 24 Climate Zone 12
- Winter design temp
- 29°F
- Summer design temp
- 90°F
Orinda design conditions are about 29°F for winter and 90°F for summer. Tree shade softens afternoon heat on many lots, but south-facing hillside decks and big window walls still push cooling loads. Winter lows are cold enough that we look at low-ambient performance when choosing a heat pump.
ACCA Manual J design data · Orinda (ACCA micro-climate)
Typical Orinda homes and what they mean for HVAC
A large share of Orinda was built from the 1950s through the 1970s: post-and-beam and mid-century designs with exposed beams, tall glass and few places to hide a duct. Where ceilings are open, duct runs are limited and visible.
Many houses are built into hillsides with a daylight basement or a lower level. Heat rises through stairwells, so the lower floor can run cold while upstairs overheats, which is a classic multi-zone situation.
Large lots with mature trees mean outdoor equipment may need clearance from branches, leaf debris and roots, and the route from street to equipment pad can be long and steep.
Open-beam ceilings and Manual D
With exposed ceilings, supply ducts often have to go under the floor or in a thin soffit. We calculate friction rates for those compromised runs honestly and may recommend ductless heads for rooms where ducts cannot reach.
Manual J for glass-heavy houses
Mid-century window walls lose heat in winter and gain it in summer. We enter each pane by orientation and glazing type so the load reflects what the house really does, not an average.
Low-ambient performance at 29°F
Orinda winter lows are mild but real. In Manual S we check capacity at 29°F outdoor temperature and pick equipment that holds output there without leaning on backup heat.
Stairwell and level-to-level imbalance
Split-level and daylight-basement homes need a plan for the vertical imbalance. That can be a zoned ducted system, a separate system per level or a ductless head for the coldest room.
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Ductless and mixed systems for open-beam homes
Slim heads or a ducted-plus-ductless combination when there is no room to run conventional ducts.
Heat pump installation → -
Gas-to-heat-pump conversion
Replace a floor furnace, wall unit or forced-air furnace and AC with a heat pump, including gas cap-off and electrical.
Replacement & conversion → -
Load calculations for hillside remodels
Manual J for additions, deck enclosures and whole-house remodels, written to support permits.
Manual J load calculations → -
Smoke-ready filtration and ventilation
High-efficiency filters and ERV options for homes surrounded by trees and wildland.
Ventilation & IAQ → -
Guest house and ADU comfort
Right-sized heat pumps for detached units and above-garage suites.
ADU heating & cooling → -
Diamond Contractor installation
Installation by a Mitsubishi Diamond Contractor, with extended coverage on qualifying equipment.
Diamond Contractor →
Permits, electricity and incentives in Orinda
The City of Orinda Building Division issues mechanical and electrical permits for residential HVAC work. Orinda is in a high fire-hazard setting, and the Moraga-Orinda Fire District has its own rules, so we confirm what applies to the lot when preparing the submittal.
Orinda has not joined MCE as of our latest check, so PG&E is generally both delivery and generation provider here, but confirm on your bill. TECH Clean California, BayREN and PG&E programs may offer heat pump incentives. Availability changes, so we check before quoting.
Where we work around Orinda
Downtown Orinda and the BART area, Orinda Village, the Glorietta and Orindawoods areas, Wilder and the ridgeline streets, plus Lafayette and Moraga.
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 in Orinda
A process that starts with access and ends with commissioning
Hillside homes expose problems late if nobody looks early. We check access, loads and ducts before choosing any equipment.
01 — Site and access review
We walk the driveway, stairs, crawlspace and exterior, and note where equipment can realistically go.
02 — Manual J
Room-by-room loads including each window by orientation, the walls, the roof and the lower level.
03 — Manual S
Equipment matched to the load at 29°F and 90°F, with attention to low-ambient capacity and part-load operation.
04 — Manual D and permit
Duct or line-set layout designed for the house, then permits through the City of Orinda Building Division.
05 — Installation
Equipment set, lines and ducts routed, electrical added and gas capped, with careful handling of the property.
06 — Commissioning
Charge, airflow and zones verified. We walk you through the thermostat and filter schedule.
Everything in one scope
The parts of an Orinda heat pump job people forget
On a wooded hillside lot, a heat pump install is more than the box. It includes the route from street to pad, a place for condensate, a clear zone for airflow and sometimes a retaining detail.
We commission the system, show you the controls and leave the site clean.
Tell us about the project-
Access plan
How the equipment reaches the house on a steep lot is worked out before delivery.
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Pad or bracket
Outdoor unit mounted level and clear of trees, debris and drainage paths.
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Line sets and ducts
Routes chosen around open ceilings, stairs and crawlspace obstacles.
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Verification
Charge, airflow and zone control confirmed before final inspection.
Cost
What affects the cost of a heat pump project in Orinda
Orinda jobs differ from flatland jobs. Access, number of zones, whether ducts are possible, panel capacity and the distance from outdoor unit to indoor heads can matter more than the equipment itself.
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
Have an Orinda home in mind?
Send us a few details: the type of house, how many levels, what heats and cools it now and what you want to change. A plan or photos help.
- Reviewed by a project lead, not a dispatcher
- We tell you if your scope is not a fit for us
- No high-pressure in-home sales appointment
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
We coordinate with your architect and contractor
In Orinda, early coordination matters because equipment space and chases are hard to add once framing is done. We share load results and equipment dimensions while plans are still flexible.
We work with design and construction teams in Orinda and Lamorinda, or directly with homeowners.
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Architects
Mechanical systems coordinated around architecture, ceiling conditions, equipment locations, routing, and finish requirements.
Explore HVAC for architects -
General Contractors & Builders
Clear scope, scheduling, rough-in coordination, submittals, inspections, startup, and project handoff.
Explore HVAC for builders & GCs -
Mechanical Engineers
Field execution, equipment selection, controls coordination, submittals, installation, and commissioning aligned with the mechanical design.
Explore engineering coordination -
Homeowners
Already assembling your own project team? We can take ownership of the mechanical scope and coordinate directly with the other professionals involved.
Start a residential project
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
Common Orinda questions about hillside access, glass-heavy houses, zoning and permits.
How do you size a heat pump for a house with a lot of glass?
Manual J counts each window by direction, size and type. Large glass on a south or west wall can raise the cooling load significantly, which shows up in the calculation.
Will a heat pump work on the coldest Orinda nights?
Yes. Orinda’s winter design temperature is about 29°F, well within the range modern heat pumps handle. We still check capacity at that temperature when selecting equipment.
The lower level is always colder than upstairs. Will a heat pump fix that?
Only if the design accounts for it. We usually separate the levels into zones or add a dedicated head for the cold level.
Who handles permits and fire district questions in Orinda?
Mechanical permits go through the City of Orinda Building Division. We confirm whether the Moraga-Orinda Fire District has any requirements for your project at the permit stage.
Is Orinda on MCE for electricity?
Not as far as we have verified. PG&E is generally the default for generation here, but check your bill, and we will check incentive programs when scoping.
Can you add a heat pump for a guest house or studio?
Yes. A small ductless system sized to the unit’s own load is usually the right answer, and it keeps the main house system independent.
Nearby service areas
Heat pump and HVAC design near Orinda
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.