Black and Decker 7-litre air cooler: what to check before buying

No. Tank capacity describes the volume it can hold, not a guaranteed runtime. Consumption and operating conditions determine how often it needs refilling.

No. Evaporative coolers add moisture to moving air and work differently from compressor air conditioners, which remove heat from indoor air.

Match the model code on the listing to the manufacturer documentation. Check the tank, controls, dimensions, filter or cooling-pad care and whether the product is intended for your room.

These coolers generally need air exchange for effective use. Follow the product manual and allow ventilation rather than treating the unit like a sealed-room air conditioner.