Could low refrigerant cause the suction line not to be cool or sweating?

Yes, low refrigerant levels can cause the suction line to not be cool or sweating. When refrigerant is insufficient, the cooling process is compromised, leading to less heat absorption and inadequate cooling of the suction line. This can result in reduced efficiency and potentially cause the system to malfunction if not addressed. Regular maintenance and monitoring of refrigerant levels are essential to ensure optimal performance.