If you are using window units instead of central air conditioning, it is generally not necessary to cover your floor vents. However, there are a few factors to consider before making a decision:
Airflow: Blocking the floor vents can disrupt the airflow in your home. Even if you are using window units, there may still be a need for proper air circulation throughout your living space. Blocking the vents could potentially result in uneven temperature distribution or stagnant air in certain areas.
HVAC system: If you have a forced-air HVAC system that provides heating in addition to cooling, blocking the vents may affect your heating system's efficiency during the colder months. It is important to ensure that your heating system has proper airflow for optimal performance.
Noise and efficiency: Window units can be noisy, and blocking the floor vents might help reduce noise transmission from other parts of the house. However, keep in mind that central air systems are designed to cool and circulate air throughout the entire house, which can be more efficient than relying solely on window units.
If you are no longer using the central air conditioning system and are confident that your window units are capable of adequately cooling your home, you may choose to cover the floor vents for aesthetic purposes or to minimize drafts. However, it's a good idea to consult with an HVAC professional before making any modifications to your ventilation system to ensure that it won't negatively impact your home's airflow or heating system performance.