Load calculation and sizing
Equipment is sized to the house, not to the old furnace label. Oversized systems short cycle and cost more.
Replacing a gas furnace or a tired AC in Sonoma? HAXX sizes and installs heat pumps for hot valley summers, checks the panel first and handles the permit.
Serving the Plaza historic district, East Spain Street, West Napa Street, Broadway, the Eastside and the Westside and the rest of Sonoma. 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.
Sonoma Clean Power, the city's electricity provider, lists cash rebates for qualifying heat pumps. The City of Sonoma Building Division at No. 1 The Plaza issues the permits.
Sonoma sees dozens of days above 90°F a year. HAXX runs a room-by-room load calculation so the system cools on the hottest days without oversizing.
SCP lists a rebate for a qualifying heat pump and larger amounts for CARE and FERA customers. Confirm current terms with SCP before you sign.
Homes without usable ducts can take ductless or slim-ducted systems. Homes with radiant or hydronic heat may suit an air-to-water heat pump.
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.

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.

Heat pump air handler service.

Lennox ac installation.

Compressor replacement.

Mitsubishi leak detection.

Leaking coil replacement.
Sonoma Clean Power lists rebates for qualifying heat pumps, heat pump water heaters and hydronic systems, with more for income-qualified customers. Check current amounts with SCP.
The City of Sonoma Building Division. HAXX applies for the mechanical and electrical permits and meets the inspector.
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.
