HVAC, AC, furnace & commercial refrigeration
Diagnostics for residential AC and furnace systems, walk-in coolers, freezers and commercial refrigeration. We measure before we replace.
Symptoms we diagnose
- AC short-cycles or won't cool
- Furnace lockout / ignition failure
- Frozen evaporator coil
- Walk-in not holding temperature
- Compressor short-cycle or hard start
- Thermostat / smart control not responding
What we work on
- Refrigerant charge & superheat analysis
- Compressor & condenser fan diagnostics
- Defrost timer & EEV programming
- Furnace ignition & gas valve service
- Smart thermostat / control wiring
- Walk-in & reach-in refrigeration
How it works
- 01Book Appointment
Schedule service online in a few clicks.
- 02Paid Diagnostic
On-site inspection with proper instruments and service data.
- 03Estimate / Quote
Clear repair options based on the actual issue.
- 04Parts Deposit if Needed
Special-order parts may require a deposit.
- 05Repair
Performed by a technical master with proper test procedures.
- 06Invoice & Warranty
Pay on completion. Repair-specific warranty in writing.
Frequently asked
Is the diagnostic visit paid?+
Yes. Diagnosis is a paid service. After inspection we provide a written estimate or quote for the actual repair.
Do you require a parts deposit?+
Special-order OEM parts may require a deposit before they are ordered. Stocked parts do not.
Do you service the entire Bay Area?+
We serve San Jose, Los Gatos, Saratoga, Campbell, Cupertino, Los Altos, Palo Alto, Menlo Park, Mountain View, Santa Clara and surrounding cities.
Residential and commercial?+
Both. Luxury homes, property managers and commercial kitchens are core customer types for KONGRA.
Warranty
Warranty applies only to the specific repair performed and parts installed. Parts warranty depends on supplier or manufacturer terms. Unrelated failures, pre-existing issues, intermittent problems not reproduced during diagnosis, and customer-supplied parts are not covered unless agreed in writing.
Pricing
Diagnosis is a paid service. After inspection, KONGRA provides an estimate or quote based on the actual issue, required parts, labor and access conditions. Special-order parts may require a deposit before ordering.