Joy, Cambridge.

My thermal drapes are past their best and no longer keep the warmth from escaping through the windows in winter.  Before winter started this year I purchased enough shower curtains of a similar colour to the backing on the thermal drapes. They have no pattern on them and are the size used for a shower over a bath. They have worked really well – the difference in warmth when the curtains are pulled back is telling.  I bought mine at Kmart – they were a lot cheaper than the Warehouse.