'Now here is a serious energy saver,' writes David Ham, one of our shortlisted contributors. 'For years we have run without question - out of sight out of mind - two modestly sized freezers purchased probably 15 years ago. Over the summer with no heating on I questioned why our utility room always seemed warm. Then I plugged in my energy monitor to both freezers and - you have guessed it - consumption 28 kWhs per week or nearly 1,500 per annum. A new A+ rated freezer of similar volume is quoted at less than 300 kWhs per annum. New freezer obtained - 1,200 kWhs per annum saved for an investment of less than £250. Now how much was that Solar PV system?

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