As the UK continues to experience hot weather, many households are turning to portable air conditioning units to make bedrooms, living rooms and home offices more comfortable.
While these appliances can be a useful way to cool down a room, they need to be used correctly to work efficiently. Small mistakes, such as leaving doors open or failing to vent hot air properly, can make the unit work harder, use more energy and struggle to bring the temperature down.
Ventilation experts at Plumbworld explain the common air conditioning mistakes households should avoid during the heatwave.
Keep windows and doors closed while the unit is running
One of the most common mistakes people make is leaving windows or internal doors open while using a portable air conditioning unit.
Unlike a fan, which simply moves air around the room, an air conditioner is designed to cool a specific enclosed space. If warm air is constantly entering from outside or from other rooms, the unit has to work much harder to cool the area effectively.
This can mean the room takes much longer to feel comfortable and the appliance may use more energy in the process. To get the best results, keep internal doors closed and only open the window enough to allow the exhaust hose to vent hot air outside.
Make sure hot air is vented outside properly
Portable air conditioning units work by removing warm air from the room and expelling it outside through an exhaust hose. If this hose is not positioned correctly, the hot air can quickly make its way back into the room.
Simply placing the hose out of a wide open window can reduce the effectiveness of the unit, especially if there are large gaps where warm air can re-enter. This can leave you with an appliance that is running constantly but not cooling the space as well as it should.
A suitable window kit can help fix the hose in place and limit the amount of warm air coming back inside. This helps the unit cool more efficiently and keeps the room feeling more comfortable for longer.
Choose the right BTU rating for your room
Another mistake is choosing an air conditioning unit that is not suited to the size of the room.
Portable air conditioners are rated in BTUs, which stands for British Thermal Units. This tells you how much heat the unit can remove from a room. If the BTU rating is too low for a large space, the appliance may run continuously without ever cooling the room properly.
However, going too powerful is not always the answer either. If the unit is too strong for a small room, it may cool the space too quickly without managing humidity properly, which can leave the room feeling clammy and uncomfortable.
Before buying or using a unit, consider the size of the room, ceiling height, insulation and how much direct sunlight the space gets during the day.
Do not forget basic maintenance
Portable air conditioners do not usually need the same professional servicing as permanent air conditioning systems, but they are not completely maintenance-free.
Filters should be cleaned regularly, vents and hoses should be kept clear, and any collected water should be drained according to the manufacturer’s instructions. A clogged filter or blocked hose can reduce airflow, make the appliance work harder and affect cooling performance.
During a heatwave, when units are often running for longer periods, basic maintenance becomes even more important. A few simple checks can help keep the appliance working properly and reduce the risk of it becoming less effective when you need it most.
Use air conditioning as part of a wider cooling routine
To help your air conditioning unit work efficiently, it is worth taking steps to reduce the heat entering your home in the first place.
Keep curtains or blinds closed in rooms that receive direct sunlight, avoid using heat-generating appliances during the hottest part of the day where possible, and close doors to rooms that are not being cooled.
Portable air conditioning can make a big difference during hot weather, but it works best when the room is set up properly. By keeping warm air out, venting hot air correctly, choosing the right size unit and maintaining it well, households can stay cooler and help their appliance perform as efficiently as possible.
