I looked into this last year for the same reasons. I found a company that do pet screens for windows, but it was going to work out quite pricey for us, the website is streme.co.uk. We live in a bungalow with patio doors and conservatory doors that really need to be opened as they are South facing and the solutions didn't seem to be practical for our situation and then there's the cost as I already mentioned.
Other than that you could build a cat enclosure so you can open doors and windows and your cat still be safe - as well as benefit from fresh air.
In the end, we started to let ours out as we hit that really hot weather last year and nearly suffocated! I do worry about them though so I'll keep a close eye on this thread to see if anyone else has found a solution!
_________________ Clare Hendrix and Jagger, Brown Marble Boys (born 18 August 2013) Hampshire, UK
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