What factors should I take into consideration when selecting a chiller for my aquarium?

Aquarium chillers can cost anywhere from $100-$1,500 depending on the quality of the chiller itself. Here is a link that will lead you towards a good selection of chillers at various prices.

http://www.fishtanksdirect.com/aquarium-chiller.aspx

If you're not using any lights or pumps in your aquarium I advise you to get an aquarium fan it will definitely do. If you do use thing such as lights and water pump that warm up your tank you should definitely get a chiller, try the Oceanic Aquarium Chillers.

The best brand of aquarium chillers is USA Prime Aquarium Chiller and you can find their products at http://www.aquaticeco.com which also offers other aquarium chillers brands.

You'll need a chiller when the ambient room temperature is higher than the desired temperature of your aquarium. This can happen due to many reasons such as:

1) If you live in a warm part of the world and decreasing the room temperature is not good enough.

2) If you wish to keep cold water species in your aquarium.

3) If you have installed heat emitting equipment that increases the water temperature such as light, pumps etc.

I highly recommend you to get a USA Prime Aquarium Chiller you wouldn't be disappointed. You can also get chillers from Aqua Logic Aquarium Chillers, Deltec Eco Cooler Aquarium Chiller, Coolworks - IceProbe Aquarium Chiller, Oceanic Aquarium Chiller, TECO SeaChill Chillers and Tunze Aquarium Chiller the all solid chillers companies.

An in-line water chiller is equipped with internal cooling coils. Water is pumped out of the aquarium, into the chiller where it is cooled, and then back to the aquarium again. An in-line chiller can be placed away from the aquarium and is therefore easier to hide.