You must look around and buy a portable air conditioner that has the highest EER (Energy Efficiency Ratio), which will ensure that the unit will incur the least operating costs in the long term. However, EER for portable air conditioners is not measured in the same way as for other types such as window air conditioners.No formal standards have been fixed for EER evaluation of portable air conditioners and therefore actual EERs can vary depending on several factors. Still, even if the quoted ratings are taken as a general indication of efficiency, EER ratings have their advantage in allowing a comparison to be made with other portable air conditioners for making a relative selection. Therefore it is advisable to buy a portable air conditioner that has the highest EER rating. Also look for an Energy Star certified unit. This can ensure the best value for your money in the long run as it saves on your electricity bill.

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