The answer to 'installation not cooling' is that there are several common causes, including low refrigerant levels, issues with the compressor or condenser unit, and problems with the ductwork or air handler. Symptoms may include warm air coming from the vents, the system running constantly without cooling, or the compressor not turning on at all.
In many cases, the solution may involve recharging the refrigerant, replacing a faulty component, or ensuring proper airflow and ductwork. While some simple troubleshooting steps can be done DIY, it's generally best to call a professional HVAC technician, as they have the expertise and tools to properly diagnose and fix the issue.