A high-performance tint does more than look good. It blocks heat, protects your interior from fading, and makes the cabin feel like a sanctuary when the temperature climbs. Spring is the best time to book, as shops are usually less slammed than they are in the peak of July.
You are looking at about $500 for a quality install on all windows. Avoid the urge to rush this. A bad tint bubbles and peels, so take your time picking a shop with a solid reputation rather than the cheapest quote you find.
The 0% intro APR is a window of time, not a free pass. If you have any balance remaining after 15 months, the card issuer will start charging interest on what you still owe.