Load calculation and sizing
Equipment is sized to the house, not to the old furnace label. Oversized systems short cycle and cost more.
Swapping a Lafayette gas furnace and AC for one heat pump? HAXX sizes it for hot summers, checks the panel and files the County building permit.
Serving Burton Valley, Happy Valley, Reliez Valley, Trailside and Downtown Lafayette and the rest of Lafayette. 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.
In Lafayette, building permits are issued by Contra Costa County on the City's behalf. HVAC replacements at single-family homes skip the City's zoning plan check and go directly to the County.
With July highs near 87°F and heat waves above 100°F, the cooling load usually sets the size. HAXX calculates the load for each room before choosing equipment.
MCE, Lafayette's default electricity provider, offers heat pump rebates for owner-occupied single-family homes through participating contractors. Confirm current terms with MCE.
Big Happy Valley houses may need two systems or zoning. Postwar ranch homes often keep their ducts after a leak and size check.
Rated 4.8 across 515+ reviews on Housecall Pro, Google and Facebook. Read more reviews.
“Their technician was professional, honest, and took the time to explain the problem and the repair process clearly. Instead of pushing for an expensive replacement, they repaired our HVAC system and helped us save a significant amount of money. The work was completed carefully, and our air conditioner is now working well.”
“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.”
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.
Contra Costa County's Building Inspection Department issues building permits for Lafayette. HAXX applies through the County's ePermits system and meets the inspector.
Often, if you own and live in a single-family home and use a participating contractor. MCE excludes homes that added solar or EV charging in the prior 12 months. Verify terms with MCE.
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.
