The thermostat says 72°F. The system is running. You can hear the fan, feel air coming through the vents, and still find yourself sweating because the house won’t budge past 80°F. This is one of the most common calls we handle during East Texas summers, and it’s also one of the most misread. Homeowners either assume something is seriously broken and panic, or they chalk it up to “just the heat” and let a real problem quietly get worse.
Neither response serves you well. After more than 25 years serving homes across East Texas, we’ve learned that the answer is almost always somewhere in between. Knowing where to draw the line between a system under normal load and a system in genuine distress can save you from an unnecessary repair call. More importantly, it can keep a small issue from turning into a failed compressor in the middle of August.
What’s Actually Normal in East Texas Summer Heat
Most residential AC systems are sized to maintain indoor temperatures roughly 20°F below whatever it is outside. On a 98°F Longview afternoon, holding 78 to 80°F indoors is working exactly as designed. If you’re expecting 72°F when it’s nearly 100°F outside, the system isn’t failing you. It’s just hitting the edge of what it was built to do.
What makes Longview harder on cooling equipment than most places is the humidity. From June through August, your AC has to pull moisture out of the indoor air before it can focus on dropping the temperature. Humidity removal and temperature reduction happen simultaneously and compete for the same resources, which means less of the system’s capacity goes toward actual cooling during the peak of the day.
Average highs in early to mid-August run around 94 to 95°F, with overnight lows typically around 73 to 74°F. That matters because most homes get some natural relief after sundown when the equipment can partially catch up. In East Texas, that recovery window is nearly gone. Systems here run almost continuously through the hottest stretch, and that’s expected behavior, not a warning sign.
Signs the Problem Is More Than Just the Heat
There’s a meaningful difference between a system running hard because conditions demand it and a system running hard because something is wrong. A few specific observations help tell them apart.
- Air at the vents feels barely cool or room-temperature. Supply air coming out of your registers should be 15 to 20°F cooler than the air returning to the system. If it feels closer to ambient temperature, the system isn’t moving heat the way it should.
- Indoor temperature keeps rising while the system runs. If the gap between your thermostat’s set point and the actual room temperature is 8°F or more and continuing to widen, that’s not a system under load. That’s a system losing ground.
- Ice is visible on the refrigerant lines near the indoor unit. Ice on the lines looks counterintuitive on a hot day, but it’s a sign of restricted airflow or low refrigerant. Turn the system off and call. Running it in that condition makes the repair more expensive.
- New or worsening sounds from either unit. Grinding, banging, or high-pitched squealing from the indoor air handler or the outdoor condenser during summer operation are signals to stop the system and get a technician out.
Common Causes Behind a Struggling AC
When a system runs continuously without cooling effectively, the cause usually falls into one of a few categories. Some are quick homeowner fixes. Others need professional attention.
Dirty Air Filter
This is the most frequent culprit we find when a system is underperforming, and it’s also the most preventable. A filter that might last 90 days elsewhere can clog in 30 to 45 days in East Texas during peak summer because the system runs so much longer each day. A clogged filter chokes airflow across the evaporator coil, the indoor coil responsible for absorbing heat from your air. Restricted airflow through that coil is also what causes the ice formation described above.
Blocked Condenser Coil
The outdoor condenser coil has to release the heat the indoor coil absorbed. If it’s coated in debris, it can’t do that efficiently, and the whole system works harder for less result. East Texas creates a specific debris problem here: pine pollen and cottonwood are heavy seasonal contributors, and they pack into condenser fins in a way that a garden hose alone won’t fully clear. A professional coil cleaning removes the buildup without damaging the fins.
Refrigerant Leak
Refrigerant moves heat from inside your home to the outside. It doesn’t deplete under normal operation, so if levels are low, there’s a leak somewhere in the system. A low refrigerant charge forces the compressor to work harder for less heat transfer, which is why the system runs continuously without results. Topping off the refrigerant without finding and repairing the leak is a short-term fix that leads to the same problem within a season or two.
Less Obvious Causes East Texas Homeowners Miss
Sometimes the system itself is functioning correctly and the problem is in the structure around it.
Duct Leakage & Attic Heat
Duct leakage is a common contributor. Attic temperatures can reach 140 to 160°F during summer afternoons in homes with poor ventilation. Ductwork running through that space loses a significant portion of the cooled air it’s carrying before it ever reaches a vent. Homes built before 2000 are particularly susceptible, with duct leakage rates often reaching 20 to 30%. If your house is older and the system never seems to satisfy the thermostat, duct condition is worth evaluating.
Undersized Equipment
An undersized system will run nonstop every summer and never reach the set temperature. This isn’t a repair problem. It’s a design problem, and the correct solution is a properly sized replacement verified with a Manual J load calculation, which accounts for your home’s square footage, insulation, window area, and local climate. Repairing an undersized system just keeps an inadequate tool running longer.
Thermostat Placement
A thermostat positioned near a west-facing window, a lamp, or a kitchen picks up heat the rest of the room doesn’t. It reads higher than the actual living space and keeps calling for cooling even after the room has reached the set point. It’s a surprisingly common reason a system “never shuts off.”
What to Check Before You Call and When to Stop Waiting
Before reaching out for service, a few quick checks take five minutes and occasionally solve the problem entirely.
- Replace the air filter if it hasn’t been changed in the last 30 to 45 days.
- Clear the area around the outdoor unit. At least two feet of clearance on all sides lets the condenser pull in air the way it needs to.
- Confirm the thermostat is set to cool and that the fan is set to auto rather than on. Fan-only mode moves air without cooling it.
- Check that supply vents are open and unblocked by furniture, rugs, or curtains.
If the vents still feel barely cool after those checks, or if the system has run for several hours and moved the indoor temperature by only a degree or two, the cause is mechanical and won’t be resolved without a professional diagnosis. Continuing to run a system with a frozen evaporator coil or a refrigerant leak only adds to the eventual repair cost. When ice is visible on the lines or the system is making new sounds, turn it off and call.
Staying Ahead of This Next Summer
Most of what causes an AC to struggle through the hottest stretch of the year is discoverable in spring before temperatures climb. A technician who cleans the condenser coil, checks refrigerant charge, tests the evaporator coil, and measures airflow in April finds problems when fixing them is straightforward, not urgent. Our Comfort Club annual maintenance membership covers that visit and comes with priority scheduling and service discounts, which matter when everyone in East Texas is calling at the same time in August.
If you’re already dealing with a system that won’t keep up, Goode Brothers Heating & Air Conditioning, Inc. is available 24/7 and offers same-day appointments whenever possible. Give us a call at (903) 300-1760 and we’ll figure out what’s actually going on.