If you have switched from using central air conditioning to using window units, it is generally not recommended to cover your floor vents permanently. Floor vents serve a purpose beyond distributing cool air from a central air conditioning system. Here are some reasons why you might want to keep them uncovered:
Air circulation: Even if you are using window units, keeping the floor vents open allows for better air circulation throughout your home. This helps maintain a more consistent indoor temperature and reduces the potential for stuffiness or stagnant air.
HVAC balance: HVAC systems are designed with specific airflow patterns in mind. Blocking off vents can disrupt this balance and lead to uneven heating or cooling in different areas of your home.
Return air flow: Floor vents are often part of a larger ventilation system that allows air to return to the central HVAC system. Blocking these vents could restrict the flow of air back to the system, affecting its overall efficiency.
Moisture control: Uncovered floor vents can help prevent moisture buildup, which could lead to mold growth or other issues if left unaddressed.
Flexibility: While you may be using window units now, your cooling needs may change in the future. Keeping the floor vents open allows you to easily switch back to a central air conditioning system or use other cooling methods if necessary.
However, if you find that leaving the floor vents open causes drafts or interferes with the performance of your window units, you can consider partially covering them or adjusting the louvers on the vents to direct the airflow away from the areas where you have the window units installed. This way, you can strike a balance between maintaining airflow and optimizing the performance of your cooling units.
If you are unsure about what to do, it's always a good idea to consult with an HVAC professional who can assess your specific situation and provide personalized advice on how to best manage your ventilation and cooling system.