How to choose an air conditioner or electric fan

Choose the type

• Window air conditioners are cheaper and simpler to install, but noisier and need a suitable opening.
• Split types are quieter and cool more evenly, but cost more and need professional installation.
• Portable units are flexible, but are usually less efficient.
• Fans move air rather than cool it, but use far less electricity and work well in smaller or well-ventilated rooms.

Match the size to the room

Air conditioner capacity is shown in horsepower (HP) or BTU/h. A unit that is too small runs constantly and struggles, and one that is too large cools quickly but can be wasteful and less comfortable. Ask the seller or manufacturer for the recommended room size, and consider sun exposure and how many people use the room.

Look at running costs

Inverter models adjust their power instead of switching fully on and off, which can reduce electricity use over time, though they usually cost more upfront. Check the energy efficiency rating on the product, and compare the estimated running cost over a few years rather than the price tag alone.

Installation and warranty

• Ask what installation costs, and whether the warranty requires installation by an authorised technician.
• Check that your electrical circuit and plug suit the unit.
• Look at the warranty length, especially for the compressor, and where repairs are done.

Choosing a fan

Check the blade size and the number of speed settings, how loud it is, and whether there is a remote, a timer and a tilt or oscillation mode. DC motor fans usually use less power than older AC motor designs.

Listing traps to avoid

Replacement parts such as boards, coils and compressors are often listed with titles similar to whole units. Read the full title, the photos and the specifications to make sure you are buying a complete unit, and check that the model number matches the brand's own information.