In Texas, there's no gentle transition into summer. One week it's 65°F, the next it's 95°F and your AC hasn't run in four months. The worst time to find out your system has a problem is the first hot day — when every HVAC company in Texas is slammed with calls and wait times stretch to 3–5 days.
This checklist takes about 30–45 minutes for the DIY portion. It covers everything you can do yourself and flags the 5 things that genuinely need a licensed technician. Do this in March or April — before you actually need the AC — and you'll cruise through summer without a panic call.
When to Do This
✓ March – April
Ideal. Temps are mild, technicians have availability, parts are in stock, problems can be fixed before summer.
⚠️ May
Still okay, but schedule soon. Shops start getting busy. Some parts take 3–5 days to arrive.
✗ June – July
You've waited too long. Emergency rates, longer waits, and you'll be hot while you wait.
Interactive Checklist — Check Off As You Go
Work through these in order. Items marked DIY you can do yourself. Items marked PRO need a licensed technician.
STEP 1 — Before You Turn It On
Replace the air filter DIY
Even if it doesn't look filthy — do it anyway. A fresh filter prevents the #1 cause of system failure. Use MERV 8–11 rating for most Texas homes.
Clear the outdoor unit area DIY
Remove leaves, mulch, grass clippings, and debris. Clear at least 2 feet of space on all sides. Trim back any shrubs or vines.
Rinse the outdoor condenser coils DIY
Use a garden hose (gentle flow — NOT a pressure washer) to rinse from the inside out. Removes cottonwood, dust, and debris that blocks airflow. Do this before starting the system.
Check and flush the condensate drain DIY
Find the PVC drain line from the air handler. Pour 1/2 cup of diluted bleach (1:1 with water) down the line to prevent algae buildup. This prevents the float switch from tripping mid-summer.
Inspect the condensate drain pan DIY
Look inside for rust, cracks, or standing water from the off-season. A cracked or rusted pan can cause water damage. Replace if needed (it's usually inexpensive).
Check all supply and return vents DIY
Open every supply vent throughout the house — make sure none are blocked by furniture or closed off. Restricting airflow strains the system just like a clogged filter.
STEP 2 — First Startup Test
Set thermostat to COOL, 5° below room temp DIY
Turn the system on and give it 10–15 minutes. Confirm the outdoor unit starts AND the indoor air handler blows. Both must be running.
Verify cold air at supply vents DIY
Hold your hand at a supply vent after 10 minutes. Air should feel noticeably cool. If it's not, the system has a problem. Stop here and call a technician.
Listen for unusual sounds DIY
Normal: steady hum from the outdoor unit, airflow from vents. Concerning: grinding, squealing, banging, hissing, clicking that doesn't stop, or buzzing. Any of these warrant a service call.
Check circuit breaker for both indoor and outdoor units DIY
If the system doesn't start, check the breaker panel. The outdoor unit also has a disconnect box near the unit. Reset any tripped breakers once — if it trips again, call a pro.
STEP 3 — Professional Tune-Up (Schedule Before May)
Refrigerant level check & leak detection PRO
Requires a licensed technician and EPA 608 certification. Low refrigerant = future compressor failure. If refrigerant is low, finding and fixing the leak now is critical.
Capacitor and contactor testing PRO
Capacitors fail silently and take compressors with them. A tech tests these with a multimeter in about 5 minutes. A $30 capacitor replaced in spring prevents a $2,000 compressor failure in July.
Electrical connections inspection and tightening PRO
Vibration from operation loosens electrical connections over time. Loose connections cause overheating and component failure. Should be checked annually.
Blower motor and evaporator coil inspection PRO
Dirty blower wheels reduce airflow significantly. A dirty evaporator coil reduces efficiency and can cause freeze-ups. Cleaning these components is part of a proper professional tune-up.
System amperage and voltage verification PRO
A compressor drawing more amperage than rated is working too hard — an early warning sign of impending failure. This simple test can save you from a mid-summer emergency.
⚠️ If You Find Any of These — Stop and Call Us
Ice forming on the indoor coil or refrigerant lines. Water pooling around the air handler. Burning smell when the system starts. Outdoor unit not running but indoor fan is. System cycling on and off rapidly. Any of these indicate a problem that DIY fixes won't solve.
How Often to Change Your Filter in Texas
The filter packaging says "replace every 30–90 days." In Texas summer, that's too long. Here's our actual recommendation:
- No pets, no allergies, 1–2 people: Every 45–60 days during summer
- 1 pet or mild allergies: Every 30–45 days during summer
- Multiple pets or allergies: Every 20–30 days during summer
- Construction or renovation nearby: Every 2 weeks
Set a phone reminder. It takes 5 minutes and costs $8–$15. It prevents the #1 cause of summer AC failure.
📋 One More Thing — Check Your Thermostat Batteries
Non-smart thermostats run on AA or AAA batteries that can die at the worst time. If you have a battery-powered thermostat, replace the batteries now as part of your spring startup. It takes 2 minutes and has prevented more than a few "my AC isn't working" calls that turned out to be dead thermostat batteries.
Is Your System 10+ Years Old?
If you're doing this checklist on a system that's 10 years or older, the spring startup is also a good time to have an honest conversation about its remaining life. A technician doing your tune-up can give you a realistic assessment of how many years the system likely has left — so you can plan ahead instead of being forced into an emergency replacement in July.
If replacement is on the horizon, the Frontdoor Equipment Upgrade Program offers 30–50% off system replacements. Upgrading on your timeline — in spring, when you have time to plan — is always a better situation than emergency replacement in July heat.
Schedule Before May — Availability Fills Fast
Spring tune-up slots fill quickly in March and April. Call or submit the form and we'll get you on the schedule before the summer rush begins.
📞 (830) 252-9000
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