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Double glazing is only really good for sound insulation. To preserve heat, just get heavy curtains.

I've got the previous panel up in the attic
jesus it was heavy
Milan.

We had a cat flap put into our patio doors - I did briefly consider keeping the (perfectly good) original pane but had nowhere to store it.. and yes.... 'kin heavy!
The mogs will get used to it eventually... you just need to persevere with treats on the otherside the flap etc..
I tried lying down by the flap and pushing my hand in and out of it - the cats just sat and watched me with that "what's the stupid human doing now?" look on their faces![]()
Magnet type ones are crap. Never work.
We gave up on that. Ours is just a 4 way locking one.
Mrs is currently fostering some kittens so catflap was locked and we forgot to unlock it. Our cat who is a big bugger managed to smash his way through. Good effort mind.