San Jose air conditioners sit idle through a mild winter and then run for hours on the first hot afternoon of the year. That jump is when tired parts give out. A proper spring tune-up does three things: it cleans what blocks heat transfer, it measures how the system actually performs, and it finds the part that is about to fail while replacing it is still a scheduled job rather than a hot-weekend call.
What gets done on the visit
| Part | What we do | Why it matters here |
|---|---|---|
| Outdoor coil | Clean it, straighten bent fins, clear debris from the base | Summer dust and leaves from mature trees cut its ability to shed heat |
| Capacitor and contactor | Measure the capacitor against its rating, inspect the contacts | Heat weakens capacitors; a weak one is a common cause of no-cooling calls |
| Refrigerant circuit | Judge the charge from pressures and temperatures, look for oil at joints | Oil at a fitting points to a leak that is cheaper to fix now |
| Indoor coil and blower | Inspect the coil face and blower wheel, measure motor current | Dust on either lowers airflow and can freeze the coil |
| Condensate drain and pan | Flush the line, test the float switch, inspect the pan | Attic units drain above finished ceilings |
| Filter | Replace or check it, confirm the right size | Long run hours load filters fast |
| Wiring and thermostat | Tighten connections, look for heat-darkened wires, confirm the thermostat starts and stops the system | Loose connections overheat under summer load |
Measured, not just looked at
Anyone can glance at a coil. What separates a real tune-up from a quick visit is numbers: the temperature drop across the indoor coil, superheat or subcooling to judge the charge, motor current against the nameplate, and on many systems the static pressure that shows how hard the blower is working against the ducts. The readings go into a written report. Next spring they are compared with this year’s, and a slow drift, such as a capacitor losing strength or a charge creeping down, shows up long before the system quits.
Low charge always means a leak. Adding refrigerant without finding it only postpones the problem, so a low reading leads to a leak search, priced before any work.
What a tune-up will not fix
- Leaky or crushed ducts. In older Willow Glen and Cambrian homes the original ducts run through hot attics. A tune-up can spot a run that has come loose at the air handler, but sealing or replacing ducts is separate work.
- Wrong sizing. If the system was oversized or undersized for the house, no amount of cleaning changes that.
- A worn-out compressor. Measurements can warn you; they cannot reverse wear.
- Dirty ducts. If dust blows from the registers, look at air duct cleaning.
Local notes: plan the visit around your house
- Timing. Book in spring, before the first stretch of hot days. Homes on the warmer valley floor run their AC the longest, so they gain the most from a visit before the season.
- Trees. Under the mature canopy of Willow Glen and Rose Garden, leaves and seed pods fall into the top of the outdoor unit and settle on the coil, so check the top grille again in late summer.
- Two systems. Many larger Almaden Valley homes have two. Each gets the full set of checks; mention both when you book so the visit is priced correctly.
- Equipment age. Evergreen tract homes with builder-grade equipment reaching replacement age, and Blossom Valley homes with original systems around 40 years old, get the most from the report. It shows which parts are wearing out, so a replacement can be planned instead of forced.
Between visits
- Check the filter monthly in summer and change it when it looks grey. Our guide on how often to replace an HVAC filter covers the details.
- Keep a couple of feet clear around the outdoor unit. With the power off at the disconnect, rinse dust off the coil gently with a garden hose; never use a pressure washer.
- Keep supply registers and return grilles open and unblocked.
- If water appears near the indoor unit or the system shuts off on its float switch, turn it off and book an AC repair visit.
Cost and plans
A tune-up typically costs $89 to $199, depending on the type of system and how much cleaning it needs. Any repair the technician finds is priced before work starts, and you decide whether to go ahead. Keep the dated report: many manufacturer warranties exclude failures caused by lack of maintenance, and the report is your record. If you want the AC checked in spring and the heating in fall, a maintenance plan covers both, or you can book furnace maintenance on its own.