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AC Not Cooling the House
in Sioux Falls, SD
In Sioux Falls, summers regularly push past 90 degrees, and your AC has to work hard to keep up. When the system runs constantly but the house stays warm, something is wrong inside the unit or the refrigerant line. Left alone, the compressor will overheat and fail, and that repair costs far more than catching the problem early.
Quick Answer
When your AC runs but can't cool your home, the most common cause in Sioux Falls is low refrigerant or a dirty condenser coil clogged with cottonwood or dust. A technician needs to check the refrigerant level and inspect the coil. If the coil is frozen or the refrigerant is low, those issues need fixing before the unit can do its job. Call (605) 231-9370 to schedule an inspection before the next heat wave hits.
Telltale Signs
Warning Signs to Watch For
- The thermostat is set to 72 but the house sits at 82 or warmer
- The AC runs for hours without shutting off
- Warm air blows from the vents instead of cool air
- Ice forms on the refrigerant line or the indoor coil
- The outdoor unit runs loudly but the indoor air barely moves
- Humidity feels heavy inside even with the AC on
Root Causes
What Causes AC Not Cooling the House?
Low Refrigerant Level
Refrigerant carries heat out of your home. When there is a leak, the system loses its ability to transfer heat and the air coming out of the vents stays warm. In Sioux Falls, units installed before 2010 often use R-22 refrigerant, which is no longer made and harder to source.
The Fix
Refrigerant Leak Detection and Recharge
A technician finds the leak, repairs it, and recharges the system to the correct level. Simply adding refrigerant without fixing the leak is a short-term patch that will not hold.
Dirty or Blocked Condenser Coil
The condenser coil sits in the outdoor unit and releases heat to the outside air. Cottonwood fluff from Sioux Falls trees blankets outdoor units every June and July, blocking airflow so heat builds up inside the coil and the system cannot cool. A coil that is 30 percent blocked can cut cooling capacity in half.
The Fix
Condenser Coil Cleaning
A technician rinses the coil with a low-pressure hose and applies coil cleaner to break up packed debris. This restores airflow and lets the unit reject heat the way it was designed to.
Failed Compressor
The compressor pumps refrigerant through the system. If the unit has been running with low refrigerant or restricted airflow for a long time, the compressor overheats and burns out. Units over 15 years old in Sioux Falls are especially prone to this because they ran through many hard summers before modern efficiency standards applied.
The Fix
Compressor Replacement or System Replacement
A failed compressor can be replaced, but on a unit older than 12 to 15 years, replacing the whole system is usually the smarter move. A new compressor in an old unit often leads to more failures within a year or two.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Low Refrigerant Level | Dirty or Blocked Condenser Coil | Failed Compressor |
|---|---|---|---|
| Ice on the refrigerant line or indoor coil | |||
| Outdoor unit coated in cottonwood or debris | |||
| Unit runs but makes a loud grinding or clicking noise | |||
| Warm air from vents with no visible ice or debris | |||
| Outdoor unit hums but the fan does not spin |
Free Inspection
Get a Diagnosis in Sioux Falls
An on-site inspection is the only way to confirm which cause applies to your property. Free, no obligation.
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