Both window and portable air conditioners can cool small rooms but their performance is different. Portable air conditioners are also relatively energy-efficient. These spot cools work the same as your home's air conditioner, using a chilled refrigeration to cool air that runs over coils. However, with ductless mini splits, you can rest assured that the cooling capacity will be powerful enough to make your space comfortable quickly. We rent units ranging from 10,000 - 83,000 BTU, and we offer on-site delivery, setup, and pick up when you no longer need the unit. Mold can grow if you don't use your portable air conditioner every day and leave the water in the bucket. Casement windows have hinges on both sides and can swing to the left or the right. The hot refrigerant is blown out of the exhaust pipe by another fan. Below are the top portable ACs from brands like Lloyd Blue Star Korya and others. The thing about portable units is they are not as efficient at cooling a room as compared to a window AC such as the one we reviewed in our Frigidaire BTU review. We also rent evaporative coolers for outdoor or large indoor spaces, and even large AC units that can chill an entire building. This will ensure that the unit functions properly and does not overheat. The main benefits of a portable unit are its ease of storage, versatility and cost. According to a study by the Department of Energy, about 40% of the energy costs of a typical commercial building are spent on heating and cooling. The BTUs correlate with the amount used or saved of electricity. Prospective buyers will be able to purchase these air conditioners at $89.99 for a single unit, $202.48 for 3 units, and $247.47 for 4 units.