How to save money on heating in an electric-only flat? I live in the UK and we have an electric-only apartment. It is a new build and it's always very very cold. We seem to be using a lot of energy every day (25KwH with the heating on for 3 hours in the morning and the boiler on for 4 hours a day, plus daily life). 

My question is, with an electric radiator system, is it more effective (and cheaper) to have the heating on for a shorter period but at a high temp, or have the heating on low throughout the day? 

We also have issues with condensation and a bit of damp which I think are partially due to just how cold the flat is usually.

PS. I'm not on an economy 7 meter.