Eg, you've got a basement sump or water source, and a tank upstairs, or down. This could involve some major work finding a path for a hose.
We looked and found an AC vent right next to the tank upstairs. Natural hole in the wall, about where we need it. Better yet, it's an air return, which is as good as a free passage---in our case, we just fished a little 1/2" hose up from below. We were, however, prepared to drill a hole into the ducting at that site and fish it through, and it's not going to affect your AC. If you move, just seal the hole, and it'll never cause any trouble. It's just a convenient highway of sorts built into your house already, so you don't have to do major plastering.
We looked and found an AC vent right next to the tank upstairs. Natural hole in the wall, about where we need it. Better yet, it's an air return, which is as good as a free passage---in our case, we just fished a little 1/2" hose up from below. We were, however, prepared to drill a hole into the ducting at that site and fish it through, and it's not going to affect your AC. If you move, just seal the hole, and it'll never cause any trouble. It's just a convenient highway of sorts built into your house already, so you don't have to do major plastering.