I agree with above, fans are great! They work especially well if there isn't much moisture in the air (they cool through evaporation, and the water is more willing to go into "dry" air), so to help it along, you can also get some form of dehumidifier. No need to go high-tech with these.
Along the same vein of thought, you can also help the cooling process considerably by doing what you can to lower the surrounding room temperature by using some form of air conditioning. Also, putting the aquarium on the floor (as opposed to a stand) will drop the temp by a couple degrees, and, if you have a multi-floor living space, keeping the tank on a lowest floor will also help considerably.
I personally also use an appropriate number of ice probe chillers. They're not as effective as actual chillers, but are available at prices that are like, 30% or less of any other chiller and cause no flow issues. I use a temperature controller to keep track of the equipment and turn on and off as necessary.
In an emergency, you can also use frozen water bottles to decrease the water temperature, but don't rely on it for consistent use, since the sudden temperature swings can cause stress for your axolotls.
I can give links to any of the equipment above (most if not all are available on Amazon) that you're possibly interested in and also answer questions if you have any.