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Your heat pump switches jobs come November. All summer it was moving heat out of the house. Now it has to pull heat from the outside air, and that's a harder job for the same system. A reversing valve that's been sticking or a defrost control on its way out tends to show itself right then. The house won't hold heat, or the outdoor unit ices up and stays iced. October is the month to get it looked at, before that first real cold spell catches it.
NOAA nClimDiv, 1991–2020 normals
The reversing valve is what breaks most often because it switches every single cycle, all year.
When it sticks, the system can't tell if it's heating or cooling, and that's when you need someone who knows heat pumps, not just AC.
Half the homes in Gregg County were built in 1980 or later. If yours is one of them, the heat pump probably isn't that old either. A sticking reversing valve or a failing defrost control on a newer system is usually a repair, not a sign the whole unit is done. Worth finding out before you assume the worst.
Problems tend to show up in the first weeks of the season, when the load hits a part that was already weak.
Find a contractorA reversing valve or defrost control is a part swap, not a system replacement, on a unit that's still within its working life. Get a technician to confirm which part is failing before anyone talks about a new system. That diagnosis takes one visit.
A reversing valve that hesitates doesn't just fail one day. Refrigerant pushes past the slide a little each time it sticks, and that erodes the seal further. Run it another month and the valve that needed a cleaning now needs a full swap.
An outdoor coil that ices up is losing airflow, and a unit starved for airflow pulls harder to do the same job. That strain lands on the compressor, the part everything else depends on. A frozen coil caught in a day is a different repair than one left alone for a week.
A heat pump that's struggling usually tells you before it quits outright. Warm air that doesn't feel warm, running longer than it used to, or short cycles that stop and start without settling in. Listen for the outdoor unit too. A clicking from the reversing valve as it tries to switch, or a unit that runs constantly and still doesn't keep up, points to that same wear. Ice on the outdoor coil that doesn't clear during the defrost cycle is another one. None of these mean the system is done. They mean a part is failing before the rest of it does, and that's exactly when a repair is still a repair.
A compressor failure is where repair versus replacement gets a harder look. That part doesn't fail in isolation. It usually means something else was wrong first, low charge, a restricted coil, airflow that was never right, and the compressor just gave out from carrying that extra strain the longest. Replacing a compressor on its own, without finding what caused it, often means another failure down the line. A reversing valve or defrost control is a contained fix because nothing else was asked to compensate for it. A worn compressor is a question about everything upstream of it, and that question is worth answering honestly before any part gets swapped.
