Comfortmaker Poor Cooling Performance

Comfortmaker air conditioner runs but does not cool well; supply air only slightly cooler than room air

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Dirty evaporator or condenser coil, Low refrigerant charge due to leak, Restricted metering device (TXV or piston), Incorrect airflow (blower speed too low)

How to Fix / Troubleshooting

Safety: Turn off power before cleaning coils or accessing internal components.

Steps:

  • Replace air filter: Ensure a clean filter is installed.
  • Clean outdoor coil: Wash Comfortmaker condenser coil from inside out.
  • Check indoor coil: Inspect and clean if accessible.
  • Verify airflow: Make sure all registers are open and not blocked by furniture.
  • Measure temperature drop: With a thermometer, check the difference between return and supply air (target ~16–22°F). If low after cleaning, refrigerant or TXV issues are likely.

Technician required: Low charge or TXV problems must be corrected by a licensed HVAC technician.

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Repair Difficulty

Medium 3/5

Required Part

Evaporator Coil and TXV
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