Aerocool Portable Ac : Part of what makes the Frigidaire’s design so remarkable are the thoughtful details that went into it. Where other portable ACs have the same unattractive accordion-style exhaust hose, for example, the Frigidaire includes a cloth sheath to cover that eyesore and provide a little insulation.There are a number of metrics you should know before buying an air conditioner. You have different EER and SEER ratings, power, amperage, voltage, and so on. Be aware that the added air volume of a garage could mean you will need to buy an AC unit with a higher BTU rating than might be necessary for a space of similar size inside the house.