Berkeley, CA · High-End Residential Remodel
5.0 • 207 Google Reviews
Residential HVAC Installation & Replacement for Bay Area Homes
Heat pumps, furnace and AC replacement, and complex residential retrofits. Planned and installed for Bay Area homeowners.
CA Lic 1086898 • Licensed & Insured • Mitsubishi Diamond Contractor
5.0 • 207 Google Reviews
Residential HVAC Installation & Replacement for Bay Area Homes
Heat pumps, furnace and AC replacement, and complex residential retrofits. Planned and installed for Bay Area homeowners.
CA Lic 1086898 • Licensed & Insured • Mitsubishi Diamond Contractor
Residential HVAC Projects
Residential HVAC for Projects Big and Small
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HVAC Replacement
Replace an aging furnace, air conditioner, or complete heating and cooling system.
We’ll help determine what makes the most sense for your home today.
Explore HVAC Replacement -
Heat Pump Upgrades
Upgrade to efficient heating and cooling in one system.
Whether your home has existing ducts or not, we’ll help determine the right approach.
Explore Heat Pumps -
Remodels & Additions
Heating and cooling planned around renovations, additions, and changing floor plans.
We can coordinate directly with your builder, architect, or project team when needed.
Explore Remodel HVAC -
New Homes & ADUs
Complete heating and cooling for new homes, custom residential construction, and ADUs.
From early planning through installation and final startup.
Explore New Construction -
Custom & Complex HVAC
For homes with difficult layouts, comfort problems, limited space, zoning needs, or projects that require deeper design input.
3RDGEN can help evaluate the home and develop the right system rather than forcing a standard solution.
Explore HVAC Design -
Not on this list
Tell us what you’re working on
Describe the home and the problem. We’ll tell you which of these it is, or if it is something else.
Start My Project
The 3RDGEN difference
Designed Before It’s Installed
A new HVAC system should be based on what your home actually needs, not simply the size of the equipment that happened to be there before.
01Manual J
Determine what the home needs
We evaluate how your home gains and loses heat so the system matches the house, not a rule of thumb.
02Manual S
Select equipment that matches
We choose heating and cooling equipment that fits those needs without oversizing.
03Manual D
Plan airflow and room comfort
We plan how air moves through the home so rooms feel balanced and comfortable.
04Startup & testing
Install, start up, and test
We install the system, start it up, and verify it is working the way it should before we call the job finished.
You do not need to become an HVAC expert. That is our job. We use the technical work to give you a better finished system.
How We Design SystemsHomeowner 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
A Clear Path From First Question to Finished System
One team from the first question through a finished, tested system, not a sales visit handed off to someone else.
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01 Tell Us What You’re Planning
Share what you’re planning (replacement, heat pump, remodel) and what isn’t working in the home. A short form or call is enough to start.
Inquiry -
02 We Review the Home and Project
We look at the existing system, ductwork, electrical, and how the home is used so recommendations match real conditions, not a catalog swap.
Home review -
03 Receive a Recommendation and Proposal
You get a clear system approach, scope, and pricing based on this home: what we recommend, why, and what it includes.
Scope + pricing -
04 Permitting and Installation
We handle permits where needed and install with one crew that already knows the plan, not a handoff to a separate install company.
One team -
05 Startup and Final Testing
We start the system, check airflow and operation, and walk you through how it works before we call the job finished.
Verified handoff
About 3RDGEN
Berkeley-Based. Built for Bay Area Homes.
3RDGEN is a Berkeley-based heating and cooling contractor working directly with Bay Area homeowners on HVAC replacements, heat pumps, remodels, and new residential systems.
You work with the people responsible for planning and delivering the project. When a remodel or new build includes an architect or contractor, we coordinate directly with the project team.
Bay Area homes
Serving Bay Area Homes
San Francisco Heating & Cooling
HVAC design, replacement, and heat pump work for homes across San Francisco — including Victorians, flats, condos, and narrow-lot single-family houses.
Cities served
- Common homes
- Victorians, Edwardians, flats, condos, townhomes, historic homes, and narrow-lot single-family homes.
- Common projects
- HVAC replacement, heat pump installation, ductwork, zoning, ventilation, remodel HVAC, and Manual J planning.
Marin County Heating & Cooling
HVAC design, replacement, and heat pump work for homes in Mill Valley, Sausalito, Tiburon, San Rafael, Larkspur, and Novato.
Cities served
- Mill Valley
- Sausalito
- Tiburon
- San Rafael
- Larkspur
- Novato
- Common homes
- Hillside homes, custom residences, mid-century homes, coastal properties, remodeled homes, and properties with indoor-outdoor living.
- Common projects
- Heat pump installation, duct design, ductless zones, filtration upgrades, remodel HVAC, ventilation, and electrification planning.
Inner East Bay Heating & Cooling
HVAC design, replacement, and heat pump work for homes in Oakland, Berkeley, Alameda, Albany, El Cerrito, and surrounding Inner East Bay communities.
Cities served
- Common homes
- Craftsman bungalows, Victorians, Edwardians, flats, condos, hillside homes, and remodeled older single-family homes.
- Common projects
- Heat pump retrofits, ductwork upgrades, ducted mini-splits, ductless systems, zoning, ventilation, and comfort balancing.
Lamorinda Heating & Cooling
HVAC design, replacement, and heat pump work for homes in Lafayette, Moraga, and Orinda.
- Common homes
- Larger single-family homes, ranch and mid-century homes, hillside properties, custom homes, and homes with additions or indoor-outdoor living.
- Common projects
- Heat pump systems, zoning, duct design, ductwork upgrades, filtration, ventilation, and comfort upgrades for remodels and additions.
Walnut Creek & Central Contra Costa Heating & Cooling
HVAC design, replacement, and heat pump work for homes in Walnut Creek, Pleasant Hill, Concord, and Martinez.
Cities served
- Walnut Creek
- Pleasant Hill
- Concord
- Martinez
- Common homes
- Suburban single-family homes, two-story homes, ranch homes, larger remodels, townhomes, and homes with attic-mounted equipment.
- Common projects
- HVAC replacement, heat pump upgrades, zoning, ductwork redesign, filtration, ventilation, and whole-home comfort planning.
Tri-Valley & San Ramon Valley Heating & Cooling
HVAC design, replacement, and heat pump work for homes in San Ramon, Dublin, Pleasanton, Livermore, Danville, and Alamo.
Cities served
- Alamo
- Danville
- Dublin
- Livermore
- Pleasanton
- San Ramon
- Common homes
- Newer suburban homes, larger single-family homes, custom residences, remodels, and homes with attic or garage mechanical layouts.
- Common projects
- Heat pump replacements, zoning, ductwork redesign, AC-to-heat-pump conversions, filtration upgrades, and comfort improvements for additions.
South East Bay Heating & Cooling
HVAC design, replacement, and heat pump work for homes in Fremont, Hayward, Union City, Newark, Milpitas, and Castro Valley.
Cities served
- Fremont
- Hayward
- Union City
- Newark
- Milpitas
- Castro Valley
- Common homes
- Single-family homes, townhomes, older ranch homes, remodels, additions, and homes with attic, garage, or crawlspace equipment.
- Common projects
- Heat pump installation, HVAC replacement, ductwork upgrades, ductless systems, zoning, ventilation, and residential comfort upgrades.
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 the strongest warranties available on qualifying 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 how we work, heat pumps, and what happens after you reach out.
Can a heat pump replace my furnace?
In most homes, yes. Whether your home has existing ducts or not, we’ll help determine the right approach.
Do I need to know whether I want ducted or ductless?
No. We evaluate the home and recommend the approach. You do not need to become an HVAC expert — that is our job.
Do you handle permits?
Yes. We handle permits where needed and install with one crew that already knows the plan, not a handoff to a separate install company.
Do you work with architects and general contractors?
Yes. When a remodel or new build includes an architect or contractor, we coordinate directly with the project team.
What happens after I submit the project form?
We review the home and the project, then send a recommendation with scope and pricing: what we recommend, why, and what it includes.
Do you offer repair, maintenance, or emergency service?
No. We focus on HVAC installation, replacement, retrofit, and remodel projects — not repair calls, tune-ups, or emergency dispatch. If you need that kind of help, a service company is a better fit.
How long does a typical installation take?
Most straightforward replacements take a few days on site. Remodels, ductwork changes, and new construction follow the project schedule. We confirm timing once we review the home and scope.