Load calculation
Equipment sized to the house, its windows and insulation, not to the old unit's label.
Installing or replacing air conditioning in Sunnyvale? Under the city's reach code a replacement AC must be a heat pump. HAXX sizes and installs it.
Serving Cherry Chase, Ortega Park, Lakewood Village, Ponderosa Park, Fairbrae and the Heritage District and the rest of Sunnyvale. 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.
Sunnyvale's 2025 reach code requires a heat pump when a single-family home replaces its air conditioner, with enforcement starting at the end of 2026. A heat pump cools the same way and heats too.
HAXX designs AC replacements in Sunnyvale around the heat pump rule, so the permit and inspection go smoothly.
Many Sunnyvale homes never had central air. A ducted heat pump or mini-split adds cooling without a separate furnace.
City of Sunnyvale and SVCE rebates apply to heat pump systems that replace gas heating. Confirm terms before you sign.
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 Sunnyvale 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
Outdoor heat pump installation.

Lennox ac installation.

American standard rooftop package unit.

Leaking coil replacement.

System recharge and brazing correction.

Heat pump installation.

Heat pump air handler installation.

Heat pump air handler service.
For single-family homes replacing an AC, Sunnyvale's reach code requires a heat pump once enforcement begins. HAXX will explain what applies to your project and timeline.
Most replacements take one to two days, plus the city inspection.
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.
