Washing machine: capacity, drum, motor and controls can strongly affect value. Common problems include bearing noise, drainage faults and leakage.
Dryer: technology, capacity and heating performance matter. Common problems include heating failure, sensors and drum noise.
Refrigerator: capacity, compressor and cooling performance matter. Poor cooling, seal damage and rust can reduce value.
Vacuum cleaner: battery or motor, suction and accessories matter. Weak batteries, blocked airflow and worn brushes are common issues.
Air conditioner: BTU, inverter technology, compressor and completeness matter. Cooling weakness, board faults and incomplete sets can reduce value.