My brother moved into a basement apartment last year to commemorate his third year status in college. Knowing how hot it can be there in Arizona, what more with him living in the basement of the building, I arranged for a Alen C425 Portable Air Conditioner to be sent to him the week he moved in.

Alen Portable Air Conditioner - C425
After using it for a few weeks, he called me up to thank for it (finally!). With a vaulted ceiling, the room could easily reach the 90F range on the thermostat, especially when the computer and dual monitors running at the same time. The portable ac unit was able to cool down the room at until 75F at best.
The downside to it is that, if you leave the room to heat up again and you have to re-cool it from scratch, it would take forever to bring down the temperature again. So whenever he’s out, he’ll readjust the thermostat so that the portable ac keeps the room cool through out the day.
With the Alen C425 Portable Air Conditioner, you have the choice of using a removable water tank or continuous drainage through a hose. According to my brother, he needn’t empty the condensate tank often, maybe once a day, but that’s maybe it’s dry where he’s at.
The only thing that bothers him is that when it is set on HIGH, the unit is rather loud to be ignored. But still, you can always opt to use the High mode only during the hottest part of the day when you want to cool the room quickly, while keeping it on low or medium when you want to continuously keep the room cool.
Based on his feedback, I’d say that the Alen Portable Air Conditioner – C425 have the best value, good cooling capacity and have an easy-to drain the water reservoir. You can get this unit for $466 at Amazon.com plus with free shipping while stock lasts.
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