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 gas furnace or tired AC for a heat pump in Pittsburg? HAXX sizes the system for East County heat and checks the panel before ordering equipment.
Serving Old Town, Oak Hills, San Marco, Vista Del Mar, Highland Meadows and Hillsdale and the rest of Pittsburg. 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.
Summer cooling load drives heat pump sizing in Pittsburg more than winter heating does. Getting the size right matters for comfort and for the electrical service.
HAXX runs a room-by-room load calculation so the system keeps up on the hottest days without short cycling the rest of the year.
Mechanical and electrical permits go through the City of Pittsburg's Accela Citizen Portal, and the city requires every contractor to hold a current city business license.
MCE, Pittsburg's electricity supplier, lists customer energy programs. Check eligibility and current terms directly with MCE before you buy.
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.
It depends on square footage, insulation, windows and sun exposure. HAXX calculates the load instead of matching the old unit's size.
A heat pump installation needs a City of Pittsburg permit, typically mechanical and electrical. HAXX applies through the city's online portal and attends the inspection.
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.
