My power bills is $300 - estimation only because of my 2 x boxer dogs. I need to do a reading now my new tank is running but I expect $360+
700w lights
600w heaters (on 20/7 at the moment)
L7 plus other pumps and streams (24/7)
My sump is under the house and the 600w heaters are always on. I have 30mm polystyrene around the sump including the top and struggle to maintain heat on cold nights. I am looking at insulating the overflow pipe and return pipe as these will be working like a heat exchange. I have a friend in the refrigeration business who has recommended the black foam pipe cover used on large refrigeration sites.
With his discount it will cost about $120 to do 5m of 54mm and 5m of 29mm. I expect this to make a big difference as I can get quite a breeze under my house.
Let me know if anyone else is interested in this stuff as I can do a bulk order at staff price, there are many sizes and it comes in 2m lengths so sorting out an order will be easy.
I will post sizes and prices if anyone is interested.