The answer to 'why is my installation' is that there could be several common causes for issues with your HVAC installation. Some of the most frequent problems include improper sizing, incorrect ductwork design, inadequate airflow, and improper refrigerant charge. These issues can lead to symptoms like poor heating/cooling, high energy bills, and uneven temperatures throughout your home.
In many cases, these problems are due to mistakes made during the installation process by an inexperienced or unqualified technician. Proper HVAC installation requires specialized knowledge and equipment to ensure the system is sized correctly, the ductwork is designed efficiently, and all components are installed and calibrated properly.