My advice for durability and collecting heat for warming of your dwelling, I would recommend employing the Aluminum foil as a sunblock to the interior of your dwelling.
With respect to safety, Al foil is either rolled annealed 100% Al metal or a high content Aluminum alloy. Further, it may possess a protective clear acrylic sealant, here's a reference, to a now unavailable 2013 article in Material World, quote:
When unsure of whether certain wrappers and packaging are in fact aluminium foil, perform the scrunch test – if the material springs back when scrunched, then it cannot be recycled. Most crisp packets spring back because they are made from plastic film coated in a very thin layer of metal.
Generally speaking, the latter coating is to augment the inertness of the Al foil especially to food acid compositions containing, for example, a mixture of vinegar (Acetic acid) and common salt (Sodium chloride). One can also test for the sealant chemically (by applying vinegar, salt, and gentle warming to a vessel constructed from the Al foil of interest, and observing chemical inertness) or, a bit more subjective, a flame test (where a small sheet of the foil appears to flame-up more than other similar thickness samples).
Now, if an acrylic coating is present, try another heavier brand of foil, as, I do agree it may otherwise be subject to deterioration by UV light exposure releasing problematic breakdown products.
Obviously, using Aluminum foil may present some interior design issues, so here is a source, to quote a historical reference:
The practice of interior design harkens back to the Ancient Egyptians, who decorated their naive mud homes with basic furnishings enhanced by animal skins, simple textiles, graphic biographical and spiritual murals, sculptures, and painted urns.
where, at some point, curtains of varying compositions (including, in the last 50 years, highly reflective) were also marketed.