The spring AC checklist: get your cooling ready before the heat arrives

Every summer follows the same script. The first real heat wave hits, thousands of air conditioners get switched on for the first time in eight months, and the weak ones fail that week. The repair queue stretches out just when you need cooling most. The fix is boring and effective: check the system in spring, before it matters.

What you can do yourself

• Change the furnace filter. A clogged filter chokes airflow for cooling just like heating, and it's the cheapest fix in HVAC.
• Clear around the outdoor unit. Cut back plants and clear leaves so the condenser has at least half a metre of breathing room on all sides.
• Rinse the outdoor coil gently with a garden hose, top down, with the power off. Pollen and cottonwood fluff blanket coils here every spring.
• Check the condensate drain line for drips and blockages once the system runs.
• Run the system on a mild day and confirm cool air arrives at every vent. Don't wait for a 30-degree day to discover a problem.

What a professional tune-up covers

The homeowner list keeps the system breathing. The professional visit checks the things that actually kill compressors:

• Refrigerant pressures, superheat, and subcooling, which reveal slow leaks before they become dead compressors.
• Capacitors and contactors, the cheap electrical parts whose failure mimics a dead system.
• Amp draws on the compressor and fan motors, an early warning of wear.
• Coil condition and airflow measurements, which quietly determine your efficiency.
• Thermostat calibration and controls.

The warranty angle

Most equipment manufacturers require documented annual professional maintenance to keep the warranty valid. Skip a few years, suffer a major failure, and the claim can be denied exactly when it's worth the most. An annual tune-up is cheap insurance against that conversation.