Air Conditioner Repair in Palo Alto

AC repair in Palo Alto starts with a full diagnosis: refrigerant pressures, electrical components, airflow and the condensate drain. Most no-cool calls trace back to a failed capacitor, a clogged filter or coil, a refrigerant leak, or a drain safety switch. ComfortFlow HVAC Palo Alto explains the fix and the cost before any work begins. Call 650-460-3483.

Why Palo Alto air conditioners fail when you need them most

Palo Alto’s climate is gentle most of the year, which means many systems sit idle from October through May. When the first warm spell arrives, components that have been resting for months are asked to run for hours. That is when weak capacitors give out, contactors stick, and drain lines clogged with a season of dust and algae trip the float switch.

Older homes add their own wrinkles. In Old Palo Alto and Crescent Park, air handlers often live in tight attics or crawlspaces where heat builds up and ducts were added decades after the house was built. In the Eichler tracts, cooling is frequently a later retrofit, so we see mini-splits and rooftop-adjacent line sets that need careful attention.

What we check on every AC repair visit

A good repair is a diagnosis first. We don’t swap parts until we know why the system stopped working.

• Thermostat settings, wiring and power at the air handler and outdoor unit
• Capacitor, contactor and fan motor condition with meter readings, not guesses
• Refrigerant pressures and temperature split across the indoor coil
• Indoor coil and outdoor coil cleanliness, plus filter condition
• Condensate drain, trap and safety float switch
• Ductwork at the plenum for disconnected or crushed sections
• Breaker, disconnect and line voltage under load

Common AC problems we fix in Palo Alto homes

The system runs but the air isn’t cold

Usually low refrigerant from a leak, a dirty coil, or an outdoor fan that has stopped turning. Topping off refrigerant without finding the leak only buys a few weeks, so we locate the leak and tell you whether it is worth repairing.

The outdoor unit hums but won’t start

A failed start or run capacitor is the most common cause and one of the least expensive repairs. A stuck contactor or seized fan motor are the next suspects.

Water around the indoor unit

A clogged condensate line or a cracked drain pan. Left alone, it can damage drywall and flooring, so this one is worth calling about quickly.

Short cycling or a breaker that trips

Electrical faults, an oversized system, or a compressor working against high head pressure. We measure amperage draw to find the real cause.

Repair or replace?

We give you both options when replacement is on the table, with honest reasoning. A 15-year-old system with a major refrigerant leak on an older refrigerant is often a better candidate for a heat pump upgrade, especially since City of Palo Alto Utilities offers a heat pump rebate when you replace a gas heater. A 6-year-old system with a failed capacitor is a repair, every time. Our guide on repairing versus replacing an AC in Palo Alto walks through the math.