If your AC has been running nonstop the last couple of days, you’re not imagining it. With an Extreme Heat Warning in effect across North Texas and heat index values pushing near 108°F, every air conditioner in Denton County is working harder than it’s designed to run for this long. And when AC systems work overtime, condensation drain lines are exactly what tends to fail first.
Here’s the part most homeowners don’t know until it’s too late: a clogged or failing drain line doesn’t announce itself with a bang. It shows up as a quiet drip in the attic, a soft spot in the ceiling, or a puddle by the closet where nobody thought to look. By the time you notice, water’s often already found its way into drywall, insulation, or flooring.
The good news is this is one of the easiest things to catch early, if you know where to look. Here’s a five-minute checklist you can run through today.
Your 5-Minute AC Leak Checklist
1. Check the drain pan under your indoor unit
If your air handler is in a closet, attic, or garage, take a look at the drain pan underneath it. Standing water, rust, or a musty smell means water isn’t draining the way it should.
2. Look at the PVC drain line outside
Most systems have a white PVC pipe that exits near the outdoor unit or along the side of the house. It should be dripping steadily in this heat — that’s normal. What’s not normal is no drip at all (possible clog) or water pooling right at the base of the house (possible blockage forcing water back inside).
3. Feel around the ceiling below the attic unit
If your air handler is in the attic, walk the rooms underneath it. Run your hand along the ceiling for any spot that feels cool, soft, or damp. Discoloration — even a faint yellow or brown ring — is worth taking seriously, even if it’s small.
4. Check for a musty smell near vents or closets
Moisture has a smell before it has a visible stain. If a room smells “off” and you can’t place why, that’s reason enough to look closer.
5. Listen for the secondary drain pan alarm
Many systems have a float switch that shuts the AC off if the primary drain backs up. If your unit has randomly stopped cooling, this might be why — and it’s actually doing its job protecting your home.
Why This Matters More During a Heat Emergency
During normal weather, a slow drain leak might take weeks to cause real damage. During a stretch like this, with the system running almost continuously to keep up with 108° heat index days, that same leak can dump a lot more water in a lot less time. What would’ve been a minor drip in April can become genuine AC overflow damage to a ceiling or wall in the middle of a July heat wave.
The moisture itself is only half the problem. Warm, humid North Texas air sitting inside a wet wall cavity is exactly the environment mold needs to get started — often within 24 to 48 hours.
If You Find Water
If you catch a leak in progress, the biggest favor you can do yourself is act fast. Get towels down, move anything valuable out of the way, and if it’s safe to do so, shut off the AC unit until it can be looked at — but don’t unplug or disable anything you’re not sure about, and don’t assume a small stain means a small problem underneath it. Surfaces dry a lot faster than the structure behind them, and what looks fine on top can still be holding water where you can’t see it.
I can’t promise every leak is a quick fix — sometimes it’s a five-minute drain clear, sometimes it’s more. But I can promise a straight answer about which one you’re dealing with, and a plan to handle it without any surprises along the way.
If you’re in Denton, Pilot Point, or anywhere around North Texas and you’re staring at a wet ceiling or a mystery stain right now, give Josh a call or shoot a text — that’s often the fastest way to reach him, especially when he’s already out on a job. He’s typically on-site within the hour for anything urgent, and you’ll be working directly with the person who’s actually going to fix it — not a call center, not a stranger. That’s the whole point of a small, local operation.
And if nothing’s leaking today but you’d rather be ready before it happens, our free guide, The First 24 Hours After Water Damage, walks through exactly what to do in those first critical hours. Worth five minutes now, so you’re not searching for answers later.
-Ally
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