Most window installation and repair companies can handle putting tint film over your existing windows, but it’s best to hire a company that specializes in window tinting. This decision will result in the best application for the cleanest look, and it usually means you’ll get a better professional opinion about the type of tint and tint level that makes the most sense for your home and personal preferences.

Energy-efficient windows are judged on their performance according to a few different factors, including heat transfer, air leakage, light transference, and condensation resistance. If you're unsure whether a window is energy-efficient, look for an ENERGY STAR® label from the U.S. Environmental Protection Agency (EPA). If various products, including windows, meet energy-efficiency standards set by the federal government, the EPA issues this label to help consumers identify energy-efficient products.

Yes, with special treatments that help repel water spots and grime build-up.

While you need heat to peel back window film, the tint will often leave behind adhesive residue. You can use chemicals such as isopropyl alcohol or acetone to remove the residue, though hardware stores sell specialized solutions for this purpose as well. You can also use soapy water in a pinch!