It is generally not necessary to turn off your furnace during the summer when using the air conditioning (AC). In fact, keeping the furnace operational can have some benefits. Here's why:
Improved Air Circulation: The blower motor in your furnace helps circulate air throughout your home. By leaving the furnace on, the blower motor continues to operate, helping to distribute the cooled air from the AC more effectively and evenly throughout the house.
Enhanced Filtration: Furnaces are equipped with air filters that help remove dust, allergens, and other airborne particles from the circulating air. By keeping the furnace running, you can maintain filtration and improve the overall air quality in your home, even when the AC is in use.
Dehumidification: In some cases, the furnace can aid in dehumidification. While the AC primarily removes moisture from the air during the cooling process, the furnace can help reduce humidity levels further. The air passing through the furnace's evaporator coil can undergo additional dehumidification, which can contribute to a more comfortable indoor environment.
However, it's important to note that leaving the furnace on during the summer does not mean that you need to keep the heat function activated. You can simply switch the furnace to "Fan Only" mode, which allows the blower motor to run without activating the heating elements.
Regarding your concern about accumulating moisture on the furnace, it is unlikely to be a problem if your AC system is properly installed and functioning correctly. The cooling process of the AC naturally removes humidity from the air, and the condensation is typically collected and drained away from the furnace.
Nevertheless, if you have any concerns or doubts about your specific HVAC system, it's always a good idea to consult with a professional HVAC technician. They can assess your system and provide guidance on the best practices for your particular setup.