What You Can Do: The Homeowner's Part First, safety: turn off the power at the disconnect switch near your outdoor unit. Then, clear the area. Remove any leaves, sticks, or overgrown plants within two feet of the unit. Good airflow is critical. Inside, replace your furnace filter — a clean filter protects your AC coil too.
What We Check: The Tech's Deep Dive This is where our spring maintenance visit comes in. We measure the refrigerant charge. Too low or too high reduces efficiency and can kill the compressor. We clean the condenser coils with a gentle spray, removing the winter grime that acts like a winter coat on your AC. We check the amperage on the compressor and fan motor to catch electrical issues early.
Testing the System Under Load We don't just look at it; we run it. We measure the temperature drop between the air going into your return and out of your vents. A proper drop (usually 16-22°F) means it's cooling effectively. We listen for unusual noises from the blower motor or compressor and check the condensate drain to make sure it's not clogged and leaking water into your pan.
Why This Matters for Chicago Summers Our humidity is the real challenge. An AC that's slightly low on refrigerant might still cool, but it won't dehumidify properly. You'll feel clammy even if the thermostat says 72. A dirty coil makes the system work harder, spiking your ComEd bill. A clogged drain can cause water damage in your basement or crawlspace.
Scheduling this tune-up in May or early June gets you on our schedule before the rush. It also gives us time to order any rare parts if we find a potential problem, so you're not waiting weeks in the heat. A little prevention keeps you cool all summer.