This is a bit less drastic than purring walls shut and also works quite good:
ROI should be only a few months.
You also can install a heat transfer drain:
It's a bit harder to retrofit in an existing bathroom but if you're renovating it is a must have, really saves a lot.
Quote:
Originally Posted by earl92
just use heat blocking windows to make cool envoirment.
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Replacing the windows can be harder to pull of in a flat but some heat blocking foil goes a long way if you live in a warm environment.