In DFW, the cooling season runs long. Our systems start working in spring and don’t get a real break until late fall, which means small problems have months to turn into big ones. The repairs Houk technicians get called out for in July are rarely surprises. They’re usually the result of something minor that went unchecked since spring: a filter no one swapped, a drain line that slowly clogged, an outdoor unit buried in grass clippings.

The good news: preventing most of these takes no special skill. A few low-effort habits, done on a regular schedule, keep the system running the way it should and head off the breakdowns that ruin a hot weekend. Here’s where to start.

At a Glance

Keep up with these four habits, and you’ll head off the repairs that catch DFW homeowners off guard mid-summer:

• Air filter: check monthly, replace when it looks dirty.
• Condensate drain line: flush with vinegar every month or two and keep the pan dry.
• Outdoor coils: clear debris and rinse the fins a few times a season.
• Thermostat: run a steady schedule instead of big manual swings.

Any AC maintenance involving refrigerant or electrical components is best left to a licensed technician.

How to Maintain Your AC Through a Long DFW Summer

None of the habits below take more than a few minutes, and most need to happen only a handful of times across the season. You’re not trying to do everything in one afternoon; you’re just keeping the small stuff from piling up before the first 100-degree stretch arrives. 

Prepping at the very start of spring? Our spring HVAC checklist covers what to tackle first.

Set an HVAC Filter Schedule You’ll Actually Follow

Your air filter is the cheapest part of your system and the one most likely to cause trouble when ignored. As it loads up with dust, it chokes airflow, and your air conditioner runs longer to move the same amount of air. The U.S. Department of Energy estimates that swapping a clogged filter for a clean one can cut a unit’s energy use by 5% to 15%. Left long enough, that restricted airflow can freeze the coil or strain the blower motor, which is where a cheap fix becomes an expensive one.

The DOE recommends checking your filter every month or two during cooling season and replacing it when it looks dirty. In DFW, where the season is long, and spring brings heavy pollen and construction dust, lean toward the shorter end, and check more often if you have pets or run the system constantly.

The habit: Pick a date each month to eyeball the filter and replace it when it’s gray. No tools and no technician required. And if you’d rather not handle it yourself, Houk can take care of the air filter replacement for you.

Flush the Condensate Drain Line a Few Times a Season

Your AC doesn’t just cool the air; it pulls humidity out of it. In a hot, humid DFW summer, a large amount of that water condenses on the cooling coils and has to drain off somewhere to avoid damaging the system or your home. That somewhere is the condensate drain line. Over time, algae and sludge build up inside it, and a clogged line backs water into the drain pan. At best, that trips a safety switch and your system quietly shuts off on the hottest day of the year. At worst, it overflows and leaves you with water stains or ceiling damage.

A little condensation around the unit is normal, and we’ve covered which AC behaviors are worth worrying about and which aren’t. A line that’s actually backing up is the kind that needs attention.

The habit: Every month or two, flush the drain line to head off clogs. You can run warm water and distilled vinegar through the access point to break down the buildup, then check that the pan underneath is dry. If water is pooling and won’t drain, or you see it around the indoor unit, that’s a job for a licensed HVAC technician.

Rinse the Outdoor Coils When They Get Dirty

The outdoor unit is where your system dumps the heat it pulls out of your house, and it can only do that if air moves freely through the coils. When those coils get caked with dust, grass clippings, cottonwood, or leaves, the unit can’t shed heat efficiently. It runs hotter and longer, your bills climb, and the compressor, one of the priciest parts to replace, takes the strain.

Keeping it clean is mostly about keeping the area around it clear. The DOE recommends trimming plants back at least two feet to protect airflow.

The habit: A few times a season:

1. Shut the unit off at the disconnect.
2. Clear away leaves and debris around it.
3. Gently rinse the fins with a garden hose to wash away dust and pollen (skip the pressure washer, as it can bend the fins).
4. If the buildup is greasy or the fins are crushed, leave the deep cleaning to a technician, who can include it during your AC tune-up.

Keep a Steady Thermostat Schedule Instead of Big Swings

How you run the thermostat affects how steadily your system works. Constant manual overrides, nudging it down a few degrees, then down a few more when the house doesn’t cool fast enough, can push the system into short, frequent cycles instead of the longer, even runs it’s built for. That kind of rapid on-off cycling is what wears parts out faster.

A set schedule avoids that. Letting the temperature rise while you’re out and easing it back down on a timer is perfectly fine and won’t hurt the system; the goal is to let it follow a predictable rhythm rather than react to constant adjustments.

The habit: Use a programmable or smart thermostat to run a consistent daily schedule instead of making frequent manual changes. No technician needed.

What These Habits Can’t Cover

These habits cover the things that quietly cause most preventable repairs: airflow, drainage, and everyday wear. What they don’t cover is anything inside the sealed system. Refrigerant levels, electrical components, and internal parts aren’t homeowner territory, and refrigerant in particular is regulated: under EPA Section 608, only certified technicians are legally allowed to handle it. If your system is low on refrigerant, tripping breakers, or behaving in ways a clean filter doesn’t fix, that’s the point to bring in a professional who can open up the parts you can’t.

A Few Minutes Now, Fewer Repairs Later

None of this is complicated, and none of it takes long. A filter you change regularly, a drain line that stays clear, an outdoor unit that can breathe, and a thermostat that isn’t fighting you add up to a system far less likely to quit when DFW hits its hottest stretch. The small habits are what keep the big repairs off your calendar.