A newly installed air conditioner that is not cooling properly may be experiencing one or more of several common issues, including an incorrect refrigerant charge due to improper installation, a poorly vacuumed refrigerant line that contains moisture or air, a unit that is undersized for the room it is cooling, or an installation location that is exposed to direct heat sources that reduce the system’s efficiency. Other possible causes include a dirty or improperly fitted air filter, blocked airflow from nearby furniture or walls, or an electrical issue affecting the compressor’s performance. Contact the installing technician or the brand’s authorized service center to conduct a diagnostic check before assuming the unit itself is defective, as most early cooling problems are installation-related and can be resolved without replacing the unit.