There wasn't anything wrong with the wooden windows that I had other than they let air in around the edges and heat out  through the thin, 77 year old glass.

So I went for new ones: aluminum ones but opted only to replace the sashes and non opening windows.
That way, I hoped to retain the look, from the street, that they look roughly the same as before.
Inside, the timbers remain as well.

Looking good!

Any double glazing (might not be necessary)?

Consumer NZ did a very interesting article on double glazing recently. Looked at cost vs return for a number of scenarios. Even compared r values. Wooden windows actually came out well against our aluminum frames. Very difficult to get value out of retrofitting on to them as the al transfers the heat so well. Good curtains seemed to be most important

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I am replacing all windows in the house. It has quite few for its age. Luckily the place was well designed for the sun- unusual for 1935!
I always have thermals, plus blinds under those.

Thanks Babs

Excellent!

Thank you gentlemen and ladies....

Treat yourself to a beer Tom!

Now you will have to get them from the fridge instead of pre chilling them on the window sill.

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LOL!