Category specific Ajax search filter for custom fields and taxonomies

I would like an Ajax search option that would show the specified custom fields and taxonomies of the category a visitor is browsing trough.
I’m working on a site that will have lots of different kind of products under many categories and each category requires it’s own custom fields or taxonomies to search trough. For example: Category shoes requires color and size populated with different colors and sizes to choose from, while category washing machines requires Energy labels and drum size populated with different labels and sizes.
It needs to be Ajax powered so that people can narrow down the results by selecting several attributes untill they find the product that has all they require.
A good example of what I’m looking for is the search filter in the site

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