Can my furnace and air conditioner be replaced by a heat pump?
Often, yes. We evaluate loads, ducts, airflow, electrical requirements, and equipment locations first.
RESIDENTIAL HVAC · UNION CITY, CA
Residential HVAC & Heat Pumps in Union City, CA
Whole-home heat pump systems for Union City homeowners planning HVAC replacements, remodels, additions, and substantial comfort upgrades — designed around the existing distribution system, zoning, and the home’s actual heating and cooling needs.
Remodels · Retrofits · Heat Pumps · Multi-Zone Systems
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.
- 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
Residential HVAC projects we handle in Union City
Whole-home heat pump installations, central-system replacements, remodel mechanical scopes, ducted and multi-zone systems, ventilation, and residential projects where the whole mechanical system deserves evaluation before new equipment is selected.
-
New system
Heat Pump Installation
New ducted or ductless heat pump systems sized for your home, comfort goals, and how the house is built.
Heat pump installation -
Full upgrade
Heat Pump Replacement & Conversion
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 & conversion -
Central
Ducted Heat Pump Systems
Central heating and cooling through existing or updated ductwork, with loads and airflow checked before equipment is selected.
Ducted heat pumps -
Room-by-room
Ductless & Multi-Zone Heat Pumps
Mini-splits and multi-zone layouts when zoning, architecture, or tight routing make ductless or mixed systems the better fit.
Ductless & multi-zone -
Coordinated
HVAC for Remodels & Additions
Mechanical design and rough-in coordinated with your architect or builder while walls and ceilings are still open.
HVAC for remodels -
Fresh air
Ventilation & Indoor Air Quality
ERV/HRV, filtration, and balanced ventilation coordinated with your heating and cooling scope when the project needs it.
Ventilation & IAQ
RELEVANT EAST BAY WORK
Whole-home heat pump remodel
View project →
High-end residential remodel
Hearst Remodel
A representative East Bay project showing the system evaluation, equipment planning, distribution decisions, and field execution we bring to Union City residential HVAC projects.
- Home type
- Existing home, remodel for sale
- System
- Fujitsu multi-zone ductless heat pump
- Mechanical scope
-
- · 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 projectBUILT AROUND THE SYSTEM
A Union City heat-pump replacement is a chance to improve the complete system
Replacing an existing furnace and air conditioner creates an opportunity to evaluate ductwork, return air, equipment sizing, zoning, and room distribution rather than automatically carrying forward the old design.
3rdGen evaluates load, airflow, duct capacity, equipment locations, electrical requirements, and comfort goals before determining the replacement strategy.
Union City’s current Housing Element is built around both preserving existing housing and accommodating new residential growth through 2031.
-
Central replacements
Existing furnace and AC equipment can often transition to a central heat-pump system after the distribution is confirmed.
-
Duct & airflow
New equipment still depends on adequate ducts, returns, and balancing.
-
Zoning & comfort
Uneven rooms may benefit from zoning or distribution changes rather than more capacity.
-
Remodels & additions
Changes to the home should be reflected in load calculations and system layout.
Homeowner reviews
Trusted by Bay Area Homeowners
5.0
5 out of 5 stars from 207 Google reviews 207 Google reviews
-
Expand
Mitsubishi mini-split installed with outstanding care. Indoor and outdoor units done right. High efficiency meant a meaningful federal tax credit too.
-
Expand
Devin and his crew did a fantastic job installing AC for our whole house. High quality Mitsubishi equipment and a clean installation throughout.
-
Expand
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
Heat pump work, start to finish
On many Union City projects, the important decisions happen around the home, the existing system, and the distribution — not from copying the equipment that came out.
01 — Project review
Plans, goals, existing system, remodeling scope, and known constraints.
02 — Load & system design
Manual J / system sizing where appropriate, zoning strategy, equipment selection, and distribution.
03 — Equipment & routing
Indoor equipment, outdoor equipment, duct / refrigerant routing, ventilation, access, and serviceability.
04 — Permit / coordination review
Equipment locations, GC/architect coordination, and permit requirements where they apply.
05 — Installation
Rough-in and finish installation coordinated around the project.
06 — Startup & closeout
Startup, controls, commissioning checks, inspection coordination, and homeowner handoff.
Complete project delivery
The whole heat-pump project—not just the outdoor unit
A Berkeley 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 project-
Existing equipment and gas heat
Removal and replacement planned around the complete conversion.
-
Ducts, zoning, and controls
Reused, modified, or replaced according to what the design requires.
-
Electrical and permitting
Capacity, circuits, documentation, inspections, and other trades coordinated with the HVAC scope.
-
Startup and commissioning
Operation and airflow checked before the project is handed back to you.
Cost
What a whole-home heat-pump project costs — and what moves the number
Union City projects can range from straightforward central conversions to larger redesigns involving ductwork, zoning, electrical scope, ventilation, additional systems, or remodel construction.
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 Union City HVAC project
Planning a whole-home heat pump, major HVAC replacement, remodel, or multi-zone system? Send us the existing HVAC setup, project goals, and timeline.
- 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 work with the people designing and building your home
For remodels, additions, and larger residential projects, early mechanical coordination helps resolve equipment locations, duct routes, zoning, electrical requirements, ceilings, and access before those decisions become difficult to change.
We work within existing project teams in Union City and across the East Bay — or directly with homeowners when that is the right path.
-
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
Straight answers on heat pumps, whole-home HVAC, and project scope in Union City.
Can existing ducts stay?
Sometimes. Their capacity, condition, leakage, and distribution need to support the new system.
Can zoning help uneven temperatures?
Potentially. We evaluate room loads, distribution, returns, and system configuration.
Can you coordinate with my remodel contractor?
Yes. Early involvement gives us more options for equipment and distribution.
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.