Why Your AC Stops Cooling in Encino's Summer Heat — And What to Do About It

Encino Summers Are No Joke for Your Air Conditioner

If you live in Encino, you already know that summer temperatures in the San Fernando Valley can climb well into the 90s — and sometimes above 100°F. When your air conditioner starts blowing warm air or simply refuses to turn on during a heat wave, it's more than an inconvenience. It's a comfort and safety issue for your family.

At Orange HVAC — Encino, we respond to AC calls throughout the area every single summer. The good news is that the vast majority of cooling failures come down to a handful of root causes that our technicians can diagnose and fix quickly. Here's what's most likely wrong with your system — and what you should do about it.

1. Low Refrigerant from a Leak

Refrigerant is the substance that actually absorbs heat from inside your home and transfers it outdoors. If your system has a leak, the refrigerant charge drops below the level needed for efficient heat transfer, and your AC will run constantly without ever reaching your thermostat's setpoint.

Signs of a refrigerant leak include ice forming on the indoor evaporator coil, warm air coming from your vents despite the system running, and a hissing or bubbling sound near the outdoor unit. Simply topping off the refrigerant without finding and fixing the leak is a temporary fix at best — the correct repair involves locating the leak, repairing it, and recharging the system to the manufacturer's specification.

Our AC repair service includes a full refrigerant check and leak detection on every diagnostic visit.

2. Failed Capacitor or Contactor

Capacitors and contactors are electrical components that start and run the compressor and condenser fan motor in your outdoor unit. They're subjected to intense heat and electrical stress every time your system cycles, and they wear out over time.

A failed capacitor is one of the most common reasons an outdoor unit hums but doesn't actually start — or clicks off seconds after starting. The good news is that capacitors are relatively inexpensive and fast to replace. We stock the most common capacitor sizes, so this repair can usually be completed during the same visit as the diagnosis.

3. Frozen Evaporator Coil

It might seem counterintuitive that an air conditioner can freeze in the middle of summer, but a frozen evaporator coil is a common culprit when your AC runs without cooling. The coil freezes when airflow across it is restricted — usually because of a clogged air filter, a blocked return vent, or a blower motor issue — or when the refrigerant charge is low.

If you notice ice on your indoor unit or refrigerant lines, turn the system off and switch the fan to "ON" mode to let the coil thaw. Then check your air filter. If the filter isn't the problem, call for service before running the system again to avoid damaging the compressor.

This is exactly the kind of situation where a seasonal HVAC tune-up pays off — catching low airflow or a drifting refrigerant charge before summer arrives means you're not scrambling during the hottest week of the year.

4. Dirty Condenser Coils

The outdoor condenser unit in your system rejects heat from your home into the outside air. When the aluminum fins on the condenser coil get clogged with dust, cottonwood seeds, and debris — which happens quickly in the San Fernando Valley — the coil can't release heat efficiently. The result is a system that runs longer, works harder, and still can't keep your home cool.

Condenser coil cleaning is a standard part of our AC tune-up service. If your outdoor unit is visibly dirty or surrounded by overgrown shrubs restricting airflow, that's a likely contributor to your cooling problem.

5. Thermostat or Electrical Issues

Sometimes the AC itself is fine, but the thermostat or the wiring between the thermostat and the air handler is the problem. A thermostat that has lost its Wi-Fi connection, experienced a dead battery, or drifted in its calibration can cause all kinds of erratic behavior — short cycling, failure to turn on, or running when it shouldn't be.

Before calling for service, verify that your thermostat is set to