Harry : I'm really getting fed up with these telephone sales people who keep calling.
Max : I'm the same. I seem to get two or three calls a day.
Harry : What sort of things are they trying to sell you ?
Max : Well a lot of them are trying to sell double-glazed windows and doors.
Harry : Yes, I get quite a few of those double glazing calls.
Max : It's so annoying because
our house is double-glazed throughout already.
Explanation :Double-glazed window - Double glazing, compared to single glazing, cuts heat loss in half due to the insulating air space between the glass layers.
Example : Double glazing serves to keep in heat and keep out noise.
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