Your Pre-Summer AC Tune-Up Checklist

DIY Checklist

What You Can Do Before Calling a Technician

You don't need to be an HVAC expert to handle the basics. Before summer hits, spend 20 minutes on these five tasks and you'll eliminate the most common reasons air conditioners underperform or fail early in the season.

Replace your air filter. This is the single most impactful thing you can do. A dirty filter restricts airflow, forces the blower to work harder, and can cause the evaporator coil to freeze. Check it monthly during cooling season and replace it when it looks gray or clogged — most homes go through a filter every 30 to 90 days depending on pets, dust, and usage.

Clear debris from around the outdoor unit. Your condenser needs airflow to release heat. Walk out to the unit and pull back any weeds, grass clippings, leaves, or mulch that have accumulated within two feet of the cabinet. Trim branches overhead too — falling debris and dripping sap cause problems over time.

Open all supply vents and returns. Walk through the house and make sure no vents are closed, blocked by furniture, or covered by rugs. Closing vents doesn't save energy — it creates pressure imbalances that stress the system and can cause ductwork leaks.

Test the system before you need it. Set the thermostat to cooling mode, drop it a few degrees below room temperature, and let the system run for 15 to 20 minutes. Listen for unusual sounds, check that air is coming out of all vents, and confirm the air feels cool. If something seems off, you'll have time to schedule a service call before the rush.

Check your thermostat batteries. If your thermostat runs on batteries, swap them out now. A dead thermostat battery is an embarrassingly common reason for a "no cooling" call — and it's a fix you can handle in two minutes.

Professional Tune-Up

What a Professional AC Tune-Up Actually Covers

The DIY steps above are important, but they only address what's visible and accessible to a homeowner. A licensed technician goes deeper — checking the components you can't see, measuring performance with instruments, and catching the kind of slow-developing problems that turn into mid-summer breakdowns.

Refrigerant level check. Your AC doesn't consume refrigerant — if the level is low, there's a leak somewhere. A technician measures the charge, identifies any leak points, and corrects them. Running a system with low refrigerant damages the compressor and drastically reduces cooling efficiency. This is probably the most important thing a professional checks that you can't check yourself.

Evaporator and condenser coil cleaning. Even with regular filter changes, dust and grime build up on the indoor evaporator coil over time. The outdoor condenser coil collects dirt, pollen, and cottonwood fuzz. Dirty coils reduce heat transfer, which means your system runs longer and harder to reach the same temperature. A technician cleans both coils and inspects them for corrosion or damage.

Electrical connection inspection. Loose wiring, corroded terminals, and worn contactors are the leading cause of AC no-start failures. A tune-up includes tightening connections, checking capacitor health, testing the contactor, and measuring voltage and amperage to make sure everything is within manufacturer specifications.

Condensate drain inspection. Your AC removes humidity from the air, and that moisture drains through a condensate line. If the line is clogged with algae or sediment, water backs up — potentially into your ceiling, walls, or air handler. A technician clears the drain and confirms it's flowing freely.

Thermostat calibration and system cycle test. The technician verifies that your thermostat is reading the correct temperature and that the system cycles on and off properly. They'll also check the temperature split — the difference between the air going into the return and the air coming out of the supply vents — to confirm the system is cooling within normal range.

When to Consider Replacement

When a Tune-Up Reveals a Bigger Problem

Sometimes a tune-up confirms everything is running well. Other times, it uncovers something that changes the conversation. Here are the findings that usually mean a repair isn't enough.

The compressor is struggling. If amp draws are high, the compressor is hard-starting, or there's visible damage, the most expensive component in your AC is on borrowed time. A compressor replacement often costs more than half the price of a new system — at which point a full AC replacement is usually the smarter investment.

The system still uses R-22 refrigerant. R-22 (Freon) was phased out of production in 2020. If your system requires it and has a leak, the refrigerant alone can cost hundreds of dollars per pound — if it's even available. Systems that still run on R-22 are typically 15+ years old and candidates for replacement regardless.

Repair costs are stacking up. A good rule of thumb: if the cost of the repair exceeds 50% of what a new system would cost, or if you've had two or more significant repairs in the past two years, replacement is usually more cost-effective than continuing to patch an aging unit. Robert will always give you both options and let you decide — no pressure, no hard sell.