Central Texas summers run from roughly May through late September, and the difference between a system that sails through them and one that breaks down during the first 100-degree week usually comes down to pre-season maintenance. Most of it is straightforward. Some of it you can do yourself in an afternoon. The rest is what we do on a $99 tune-up visit.
This guide covers both — six DIY tasks to handle between March and May, plus the eight professional checks that require training, tools, and refrigerant certification. If you only do one thing before summer, change the filter. If you do everything below, your system is positioned to last substantially longer than one that gets ignored.
DIY Tasks You Can Do Yourself
1. Replace the Filter
The single most impactful thing a homeowner can do for their HVAC system. A clogged filter restricts airflow, which causes the evaporator coil to freeze, the compressor to work harder, and the blower motor to overheat. In Cedar Grove, between cedar pollen in spring and construction dust in the summer, a standard 1-inch pleated filter loads up in 30–60 days.
How to do it: locate the filter slot on your return grille or inside the air handler cabinet. Note the size printed on the edge of the existing filter (typically 16x25x1 or 20x25x1). Pull the old filter out with arrow pointing toward the unit, slide the new one in with its arrow pointing the same direction. That's the entire job.
How often: every 30 days in homes with pets or allergies. Every 60 days otherwise. 4-inch or 5-inch media filters last 6–12 months.
2. Clean the Outdoor Unit
The outdoor condenser coil is how your system rejects heat into the air outside. When it's coated with cottonwood fluff, cedar pollen, grass clippings, and dust, the system has to run longer and harder to remove heat from your home.
How to do it: turn off power at the disconnect box on the exterior wall next to the unit. Use a garden hose on a gentle spray setting and rinse the coil from the inside out if possible (spray downward angled through the fins). Do not use a pressure washer — it bends the aluminum fins and damages the coil. Once clean, let it dry 15 minutes before restoring power.
How often: once in early spring. Again mid-summer if there's heavy pollen.
3. Clear Debris Around the Condenser
The outdoor unit needs clear airflow on all four sides to work efficiently. Industry guidance is 24 inches of clearance on the sides and 5 feet above. Anything closer restricts airflow and reduces capacity.
How to do it: trim back shrubs, remove accumulated leaves, clear weeds, and confirm no outdoor furniture, planters, or equipment is encroaching on the clearance zone. Be especially vigilant with fast-growing plants — a rose bush or holly can grow 18 inches in a Texas spring.
4. Check Thermostat Batteries
Most battery-powered thermostats die in the spring after running heat through winter. A dead battery mid-July is a nuisance; a dying battery can cause erratic behavior and nuisance service calls.
How to do it: pull the thermostat off the wall plate (it usually slides or lifts off). Replace the AA or AAA batteries with fresh alkaline. Hardwired thermostats (like Nest or ecobee powered by the C-wire) don't have batteries.
5. Inspect Visible Ductwork for Leaks
Leaky ducts can waste 20–30% of your cooling capacity by dumping conditioned air into the attic or crawlspace. Any ductwork you can see — in the attic, garage, or unfinished basement — should be checked annually.
How to do it: with the system running, walk the ductwork and feel for airflow at every joint and seam. Obvious gaps, loose mastic, torn insulation, or disconnected sections should be noted. Small gaps can be sealed with mastic paste or UL-181 foil-backed tape — not "duct tape," which fails within a year. Larger repairs should be professional.
6. Test the Condensate Drain Line
The condensate drain line carries water from the indoor coil to a drain. When it clogs with algae (very common in humid Cedar Grove summers), water backs up into the drain pan, trips the float switch, and shuts the AC off. A stopped-up drain line is responsible for roughly 30% of our mid-summer emergency calls.
How to do it: locate the condensate line's clean-out port near the indoor coil — typically a T-fitting with a cap. Pour 1 cup of distilled white vinegar down the line every 1–2 months during cooling season. Some techs prefer diluted bleach, but vinegar kills algae without damaging PVC.
Professional Tasks (What Our Techs Do)
These require either certification (EPA Section 608 for refrigerant work), specialized tools, or both. A professional tune-up takes 60–90 minutes on-site.
1. Refrigerant Charge Check
Using manifold gauges, we verify the system is holding the correct refrigerant charge. An undercharged system cools poorly and burns more electricity. Overcharged systems strain the compressor. Handling refrigerant requires EPA Section 608 certification — this isn't a DIY task.
2. Electrical Connection Inspection
We pull the access panels on the outdoor unit and air handler and visually inspect every contactor, relay, and wire terminal. Corroded terminals and loose connections are the single biggest cause of capacitor and contactor failures. Tightening them takes 10 minutes and prevents $250+ in summer failures.
3. Capacitor Testing
Capacitors store the electrical charge needed to start the compressor and fan motors. They degrade over time, and a weak capacitor will cause intermittent failures before dying completely. We measure capacitance with a multimeter — anything more than 6% below rated capacity gets replaced proactively during the visit.
4. Blower Motor Check
We measure amperage draw on the blower motor and compare to nameplate spec. High amps indicate a failing motor, bearings running dry, or excessive restriction (often an unchanged filter). We lubricate motors that have accessible oil ports and note any that are approaching end-of-life.
5. Condenser Coil Cleaning
Beyond a hose rinse, we apply a foaming coil cleaner, let it sit per manufacturer spec, and rinse it out. This removes the oils and embedded contaminants that a garden hose won't reach. Clean coils transfer heat 10–15% more efficiently than dirty ones.
6. Drain Pan & Float Switch Test
We flush the condensate drain with compressed air to clear any buildup, fill the drain pan to trigger the float switch, and verify the safety shutoff works. If the float fails to trip, we replace it — a $35 part whose failure can cause significant water damage.
7. Thermostat Calibration
We verify the thermostat is reading room temperature accurately by comparing to a calibrated thermometer. Older mercury thermostats drift over time; newer digital models rarely do but should be confirmed. Smart thermostats get a firmware-version check.
8. Temperature Split Verification
We measure return air temperature and supply air temperature at the registers. A healthy system should produce a 16–22°F split (supply should be 16–22°F cooler than return). A narrower split indicates refrigerant issues, airflow restrictions, or dirty coils. A wider split can indicate low airflow. This is the single best end-of-service verification that everything is running correctly.
Why Pre-Season Matters
Three reasons to get this done in March or April rather than waiting until the first 98-degree day:
- Beat the rush. Our first heat wave typically triggers 3–5x normal call volume. Pre-season bookings get scheduled at standard rates with 1–2 day availability. July emergency calls run overtime rates and 3–5 day waits.
- Catch problems early. A capacitor showing 8% degradation in April can be replaced during the tune-up for $175. The same capacitor failing on a 102-degree Saturday afternoon costs $350 with overtime and emergency dispatch.
- Full cooling capacity when you need it. A system tuned in April hits June at 100% rated capacity. An unmaintained system may be running at 85–90% before you even notice, which shows up as higher bills and rooms that never quite cool down.
Signs You Need Service Beyond Routine Maintenance
If you notice any of these during your DIY inspection, book a service call rather than a standard tune-up:
- Ice buildup on the refrigerant lines or indoor coil
- Water leaking from the indoor unit or dripping in the attic
- Warm air coming from the supply registers while the compressor runs
- Unusual odors — burning plastic (electrical), musty (mold), or sulfur (gas furnace issue)
- Loud or new noises from either indoor or outdoor unit
- Short cycling (system turns on and off every few minutes)
- Electric bill climbing despite no change in usage
Meridian's Maintenance Plan
For customers who'd rather not think about it, we run a simple annual plan:
- Two tune-ups per year (spring AC, fall furnace)
- 15% off any repairs
- Priority scheduling during heat waves and freezes
- No overtime fees after hours
- Waived diagnostic/trip charges
- Written system report after each visit
Plans start at $16/month for a single system. Systems on our plan last roughly 40% longer than systems without regular maintenance. It's not a magic number — it's because catching a $35 float switch or a weak capacitor before it fails adds up over 15 years.
Frequently Asked Questions
Between mid-March and mid-May in Central Texas. This window catches problems before the first 100-degree days in June, avoids the peak-season scheduling rush, and ensures the system is running at full capacity when cooling demand spikes. Waiting until July means longer wait times and higher overtime rates.
Every 30–60 days during cooling season for standard 1-inch pleated filters. Every 30 days in homes with pets or allergies. 4-inch or 5-inch media filters last 6–12 months. A clogged filter is the most common cause of frozen coils and AC underperformance during Texas summers.
Yes — with power off at the disconnect, rinse gently with a garden hose. Angle the spray downward through the fins, ideally from the inside out. Do not use a pressure washer, which bends fins and damages the coil. Once per season in spring is enough.
Refrigerant charge verification, electrical connection inspection, capacitor testing, blower motor amp draw check, condenser and evaporator coil cleaning, drain line flush, float switch test, thermostat calibration, temperature split verification, and a written system report. Expect 60–90 minutes on-site.
A single AC tune-up typically runs $89–$150 in Cedar Grove. A maintenance plan covering both spring and fall tune-ups plus priority scheduling and parts discounts runs $16–$25 per month. Systems on maintenance plans last substantially longer than systems without regular service.
Book Your Spring Tune-Up
Full 18-point inspection, coil cleaning, refrigerant check, and written system report. Pre-season pricing through May.
Call (512) 555-0143