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Unless you're switching energy sources (ie a gas fired boiler), an aquarium heater directly in the water is the most cost effective way to heat water. There's basically zero loss in the heating process itself. Don't put the system on an electric water heater or use electric space heaters near the system, you will lose money.
That really only leaves insulation and reduction of evaporation as available options. Get creative. There are really cheap ways to insulate a sump.
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Inconveniencing marine life since 1992
"It is my personal belief that reef aquaria should be thriving communities of biodiversity, representative of their wild counterparts, and not merely collections of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae." (Eric Borneman)
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