Støynivåer kan variere mellom modeller, og det er viktig å velge en enhet med et støynivå som er tolererbart for den tiltenkte bruken, spesielt hvis klimaanlegget skal brukes i soverom eller andre stille områder. Se etter modeller som har en lav-desibel drift eller inkluderer støyreduserende teknologier.

Portable air conditioners are usually labelled with an energy efficiency rating that indicates their energy saving capabilities and helps users make informed choices about their efficiency. In Europe, the energy efficiency of portable air conditioners is usually indicated by the European Energy Efficiency Certificate. This certificate uses a scale from A+++ (most efficient) to D (least efficient). Countries such as the United States and Australia use their own energy labelling systems, such as the Energy Star rating and the Energy Rating Label respectively. Choosing models with higher energy efficiency ratings can help minimise electricity costs and reduce the environmental impact of their use.