Load calculation
Equipment sized to the house, its windows and insulation, not to the old unit's label.
New or replacement cooling for a Monte Sereno home: HAXX sizes central heat pumps, conventional AC and ductless systems and files 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.

Central air conditioners and heat pumps that also cool. Every installation starts with sizing and a look at your ducts and electrical panel, not with a model number.
Equipment sized to the house, its windows and insulation, not to the old unit's label.
Compare a straight AC with a heat pump that also heats. In many homes the heat pump costs little more and replaces the furnace later.
Leaky or undersized ducts waste a new system. HAXX checks airflow before quoting.
Circuit, disconnect and panel capacity reviewed by HAXX electricians before install day.
American Standard and Mitsubishi Electric, among others, matched to the home and budget.
Mechanical and electrical permits pulled, city inspection scheduled.
Many Monte Sereno homes were built without central air or have aging units. A heat pump often replaces both the AC and the gas furnace in one install.
Both are allowed for an existing home. A heat pump adds efficient heating and may qualify for SVCE rebates, so HAXX prices both.
Equipment on hillside and corner lots must fit zoning setbacks and slope. HAXX plans the pad, line set and noise exposure to neighbors.
A Manual J load calculation sets the size, and existing ducts are checked for leaks and capacity before anything is ordered.
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
Attic plenum resealing.

Outdoor heat pump installation.

Lennox ac installation.

American standard rooftop package unit.

Carrier furnace diagnosis and repair.

Heat pump installation.

Heat pump air handler installation.

Heat pump air handler service.
Yes. HAXX applies through the city's ePermits portal and attends the inspection.
Often, yes, if you also heat with gas. One heat pump handles both, and SVCE lists rebates for heat pump HVAC. Confirm current terms first.
Most replacements take one to two days on site. Permits, equipment lead times and any electrical work add to the overall timeline.
A heat pump cools exactly like an AC and also heats. If your furnace is aging, it is worth comparing both on the same estimate.
Share the property, equipment and questions you have in mind.
(408) 901-8315
Call HAXX to discuss your property and scheduling.
