Residential
3 systems in 25 years. One hidden airflow problem was quietly ending each one.
He had replaced the same air conditioner three times in 25 years and was dreading a fourth. The refrigerant side was fine. The answer was a single number on the air side.
Diagnostics
·
Repair
Kuna, ID
4 min
read
Replacing the equipment three times had never fixed it, because the equipment was never what was wrong.
When the Kuna homeowner called, his air conditioner had quit on a hot afternoon. But the first thing he told us wasn't about the breakdown. He'd replaced this system three times in 25 years, and he was hoping he wasn't about to buy a fourth.
He didn't need to. The reason his air conditioners kept dying wasn't the equipment at all. It was a restriction in the ductwork choking the airflow, and no new system ever fixed it because no new system ever touched it.
★★★★★ [He] answered my text within minutes, asked a few questions and basically had my issue diagnosed over the phone. A Kuna homeowner
What we found
The part that failed that day was a run capacitor. We replaced it and the system was cooling again the same afternoon. That's a common part that dies on its own, and it explained the breakdown. It didn't explain three dead systems.
The failed run capacitor, found reading zero. A common part that fails on its own, and it explained the breakdown but not the pattern.
So we measured further. The refrigerant side was healthy, with a 28.8°F temperature split across the coil. When the refrigerant side is fine and systems still fail early, the cause is on the air side. So we measured the airflow.
Static pressure is the resistance the blower fights to push air through the house. This furnace is rated for a maximum of 0.50 inches of water column. It measured 0.91, almost double.
Why that one number ends compressors
When airflow through the indoor coil is choked that hard, the coil runs too cold, and refrigerant that should leave it as vapor stays partly liquid heading back to the compressor. Compressors handle vapor, not liquid. Fed liquid, they wear out slowly, over years, on a system that looks fine right up until it doesn't.
That's what killed the first three. Not bad luck, and not bad equipment. One restriction in the ductwork, wearing out each system bolted in front of it. Every replacement inherited it on day one.
Where it stands
The system is cooling, and for the first time in 25 years the homeowner knows why the last three didn't last. The fix is to correct the restriction, not to buy a fourth system, and that's the recommendation he left with: find where the ductwork is choking the airflow and open it up, once, for good.
If you're dreading the next replacement
If you're on your second or third air conditioner in a house that isn't old enough to explain it, the equipment probably isn't the thing that keeps failing. Something isn't letting it run the way it should, and a new system won't reach it. Finding that cause is the work we do, for homes and businesses across Kuna, Boise, and the greater Treasure Valley.
Your system at its best, finally.
This visit was one of the HVAC services we provide across the valley.
Schedule an Evaluation, or call (208) 203-3000.
A new condenser installed onto the same restricted ductwork inherits the same problem on day one.
The result
Cooling restored, and a 25-year pattern finally has an explanation
The failed capacitor was replaced and the system was cooling again the same afternoon, with a 28.8°F temperature split across the coil. The measured total external static pressure of 0.91 inches of water column, against a furnace rated for 0.50, gives the homeowner something he had never had: a reason the last three air conditioners failed early, and a specific thing to correct before the next one goes in.
★★★★★ [He] showed up as promised, confirmed the issue, and had our AC blowing 55 degree cold air within a few minutes. A Kuna homeowner
Built for predictable performance
If your AC sounds different than it used to.
Northstead provides residential and commercial HVAC evaluation, repair, and predictive maintenance throughout Boise, Eagle, Meridian, and the greater Treasure Valley. Bi-annual maintenance is recommended to identify component wear before it becomes a system failure.