If you are no longer using central air conditioning and have switched to using window units for cooling, it is generally advisable to cover or close the floor vents connected to the central air system. Here are some reasons why:
Airflow redirection: When central air vents are left uncovered and active while using window units, it can lead to conflicting airflow patterns. The window units will be cooling specific rooms directly, but the central air vents may still circulate air through the ducts, potentially causing uneven temperatures and inefficiencies.
Energy conservation: Closing or covering the floor vents helps prevent cooled air from the window units from escaping through the ducts, which would be wasteful and lead to higher energy consumption. By isolating the cooling from the window units within the specific rooms they serve, you can improve overall energy efficiency.
Preventing debris and dust: Covering the floor vents can help keep dust, debris, and other particles from entering the ductwork and accumulating within the system. This can improve indoor air quality and reduce the need for duct cleaning.
Comfort and temperature control: Closing the vents in unused rooms allows you to focus the cooling efforts where it's needed most, ensuring better temperature control and comfort in the rooms you actively use.
To cover the floor vents, you can use magnetic vent covers or simply close the vent louvers if they have adjustable slats. Magnetic vent covers are easy to install and remove, providing a flexible solution if you plan to revert to using central air conditioning in the future.
Before making any changes to your HVAC system, it's a good idea to consult with a professional HVAC technician. They can provide personalized advice based on the specific layout of your home and ensure that the modifications won't cause any issues with your cooling setup.