The answer to 'installation blowing cold air' is that there are several common causes, including improper refrigerant levels, a malfunctioning thermostat, blocked airflow, or issues with the compressor or other components. Symptoms can include the system blowing cold air initially but then switching to warm air, the air not feeling as cold as it should, or the system cycling on and off frequently.
Some potential solutions include checking the thermostat settings, cleaning or replacing air filters, and ensuring there is no blockage or restriction in the ductwork. However, issues with the refrigerant levels or major component failures often require the expertise of a professional HVAC technician. It's generally best to call in a qualified technician to diagnose and repair the problem, especially if you're not comfortable working on the HVAC system yourself.