Liquid Line Filter

A device in the refrigerant line that removes moisture and debris to protect the HVAC system and maintain efficiency.

Liquid Line Filter (HVAC)
A liquid line filter (often called a liquid line filter-drier) is installed in the liquid refrigerant line of a residential HVAC system. Its job is to remove moisture, acid, and solid contaminants from the refrigerant before it enters the metering device and evaporator coil. By keeping refrigerant clean and dry, the filter helps prevent corrosion, blockages, compressor damage, and loss of efficiency. A clogged filter can restrict refrigerant flow, so regular inspection and replacement are essential for reliable system performance.