I've said it before, and I'll say it again - insulation on tanks works wonders! After insulating my tank, now only my 50W heater runs (and not 24/7), my 300W only runs some of the time. Before insulation, my 50W was running 24/7 and my 300W was usually running overnight as well. During the recent cold snap, my tank temperature never wavered (it used to dip 2 deg over
night).
Small things also help. For example, I put the cushion door stop at the foot of my door to prevent outside draft. My windows are closed and blinds are down from about 5pm. I do also run my little oil fin heater on low-medium from about 6pm which keeps the room temp comfortable without running up the bill - I'm comfortable and the tank doesn't lose as much heat to the surroundings. This is how I justify running my water pump/ FX-5/ small power head/ wave maker/ air pump 24/7. As it turns out, when you save your pennies, you feel better about spending your pounds! :lol: