Originally Posted by
SpendingDough 
Any recomendations on a cooler and if they heat the water if it gets to cold?
I have a JBJ 1/3HP chiller. JBJ's are very popular and for good reason. Check out used ones too, as you can sometimes find great deals. I wouldn't put anything smaller than a 1/5HP on a 180g.
Most just shut off once the lowest temperature setting is reached, so they don't act like heaters, although maybe some of the really expensive models serve dual roles. I don't use any heaters on my tank here in TX, so I didn't consider this when purchasing my chiller.