The short answer
EliteAir repairs air conditioners and heat pumps in Cupertino. Our technician traces the symptom to its cause, explains the repair and any alternatives, and only proceeds once you agree.
An air conditioner that quits in Cupertino tends to do it on exactly the kind of day you need it: a still, dry afternoon when the upstairs rooms are already warm and the evening breeze has not arrived yet. EliteAir sends technicians from San Jose, about seven miles to the east, to diagnose and repair cooling systems throughout 95014. We work on central split systems, heat pumps running in cooling mode, and ductless mini-splits. Rather than listing every part we can replace, this page is organized around what you are actually experiencing. Find the symptom closest to yours, read what usually causes it, and you will have a better idea of what to tell us when you book.
Symptom: the system runs but the air is not cold
This is the most common call we get. The indoor fan blows, the thermostat shows cooling, yet the air at the vents feels barely cooler than the room. The usual suspects are an outdoor unit that is not actually running, a failed capacitor that keeps the compressor from starting, a low refrigerant charge from a leak, or a condenser coil so clogged that it cannot reject heat. Go outside and look: if the outdoor fan is still and the unit is silent or just humming, turn the system off and call. Running it in that state can overheat the compressor.
Symptom: some rooms cool, others do not
Cupertino has many two-story homes and remodels where an upstairs addition was tied into the original duct system. That often leaves the far bedrooms short on airflow. When one area stays warm while the rest of the house is comfortable, we look at duct connections in the attic, dampers, supply register sizes and return air paths. Sometimes the fix is as simple as reconnecting a run that slipped off its collar. Other times it takes rebalancing or a dedicated return to bring a room into line.
Symptom: water, ice or strange noises
Each of these points to a different part of the system, so the details you notice help a lot.
- Water near the furnace or air handler: a clogged condensate drain, cracked drain pan or failed condensate pump
- Ice on the copper lines or indoor coil: restricted airflow from a dirty filter or weak blower, or low refrigerant
- Clicking with no startup: a failing contactor, relay or control board
- Grinding or squealing: worn motor bearings or a fan blade striking something
- Loud buzzing outside: electrical trouble at the contactor or capacitor
- Short cycling every few minutes: an oversized unit, a thermostat issue or an overheating compressor
Symptom: higher bills and a unit that never shuts off
Sometimes the system technically works, but it runs from lunchtime until well after dark and the electric bill climbs month after month. On dry Cupertino summer days with afternoon sun on the west side of the house, some long run time is normal. Constant running on a mild day is not. The cause is often gradual: a condenser coil coated in dust and pollen, a blower wheel caked with dirt, a refrigerant charge that has slowly leaked down, or attic ducts that have pulled apart and are dumping cool air into the attic instead of the bedrooms.
None of these stop the system outright, which is why they go unnoticed for a season or two. A technician can measure the temperature split, check coil condition and look at the attic duct runs in one visit. Cleaning a coil or reconnecting a duct is a modest repair compared with replacing a compressor that has been overworked for years.
How we diagnose
We test rather than guess. A technician checks voltage and amp draw on motors, reads capacitor values, measures refrigerant pressures and line temperatures, and records the temperature split across the indoor coil. If a leak is suspected, we look for oil traces at joints and use electronic detection to narrow down the location before adding any refrigerant.
Once the cause is clear, you get a plain explanation and the repair options in writing. Common parts like capacitors, contactors, fan motors and drain components are stocked on our trucks, so many Cupertino repairs are completed in a single visit.
Repair now, plan later
When a system is older and the failure is expensive, such as a compressor or a large coil leak, we lay out both repair and replacement with honest notes on each. If you are weighing a replacement, a heat pump is worth a look: Air District Rule 9-4 requires gas furnaces manufactured from 2029 to meet a zero-NOx standard, which steers future furnace replacements toward heat pumps. There is no requirement to replace anything that still runs. Our technicians also cover Saratoga, Los Altos, Sunnyvale, Santa Clara and Campbell.
More services in Cupertino
- Heating Repair in Cupertino
- Heat Pump Installation in Cupertino
- AC Installation in Cupertino
- Furnace Repair in Cupertino