Load calculation and sizing
Equipment is sized to the house, not to the old furnace label. Oversized systems short cycle and cost more.
Switching a Monte Sereno home from a gas furnace to a heat pump? HAXX sizes the system, checks the panel and handles the city permit.
Serving Via Sereno, the Bicknell Road area, Daves Avenue, Greenwood Lane and the El Sereno foothills and the rest of Monte Sereno. Share your address to confirm availability.

A heat pump replaces a furnace and AC with one system for heating and cooling. Good results come from sizing, layout and electrical planning done before equipment is ordered.
Equipment is sized to the house, not to the old furnace label. Oversized systems short cycle and cost more.
Keep existing ducts when they are in good shape, or go ductless where ducts are missing, leaky or impossible to run.
HAXX electricians review the panel and service before the install, so a surprise panel upgrade does not appear mid-project.
Mitsubishi Electric and American Standard systems, among others, matched to the home and budget.
HAXX pulls the mechanical and electrical permits and meets the city inspector.
We point you to the rebates your address qualifies for and provide the equipment documentation programs ask for.
Monte Sereno's 2026 reach code targets new construction and exempts replacement of existing appliances, so a heat pump in an existing home is your choice, not a mandate.
Silicon Valley Clean Energy serves Monte Sereno and lists instant rebates on heat pump HVAC through its home upgrades program, while funds last. Confirm terms before you sign.
Bay Area Air District rules end sales of new gas furnaces from 2029. Repairs are not affected, but planning ahead avoids a rushed replacement.
Eichlers on Via Sereno often suit ductless or slim-duct systems. Larger homes with attic or crawlspace ducts can take a ducted heat pump after a duct check.
Rated 4.8 across 515+ reviews on Housecall Pro, Google and Facebook. Read more reviews.
“Thorough diagnostics of A/C system, identified and repaired the issue quickly!”
“Service was performed well and on time. Service person was highly skilled and provided easy to understand options to deal with the issue. Price for diagnostics was reasonable and easy to pay online.”
“Our commercial building had several HVAC problems, and their team carefully diagnosed each unit, explained the available options, and never pressured us into unnecessary replacements. They worked hard to repair what could be repaired and kept us informed throughout the process.”
Existing equipment, home layout and what you want to improve.
Sizing, airflow, equipment placement and electrical needs.
Options, exclusions, permit requirements and any eligible incentives.
Confirm equipment, scheduling and handover details with HAXX.
A closer look at recent heating and cooling work by HAXX. Projects in Monte Sereno are marked with the city.

On site during a commercial VAV box repair: access above a suspended ceiling, equipment and the work in progress.
Explore recent projects
Heat pump installation.

Outdoor heat pump installation.

Heat pump air handler installation.

Carrier furnace diagnosis and repair.

Attic plenum resealing.

Heat pump air handler service.

Lennox ac installation.

Compressor replacement.
No. The city's reach code applies to new construction and does not apply to replacement of existing appliances. Heat pumps are still eligible for SVCE rebates.
HAXX submits the application through the city's ePermits site and meets the building inspector for the final.
Yes. Bay Area winters are mild, and correctly sized heat pumps heat comfortably through them. Sizing and duct condition matter more than the brand.
Most single-system replacements take one to three days on site. Permits, equipment lead times and any electrical work add to the overall timeline.
Share the property, equipment and questions you have in mind.
(408) 901-8315
Call HAXX to discuss your property and scheduling.
