Fumbling for keys in the rain gets old fast, and swapping in a smart electronic keyless deadbolt lock fixes that annoyance for good. Once it is installed, you can ditch physical keys, share temporary access with dog walkers, and check if the door is locked from your phone. You can usually knock out the swap yourself in under an hour, or have a handyman do it quickly if your door needs extra alignment.
Spring home improvement sales events are the absolute best time to buy, as hardware stores drop prices to kick off remodeling season. Before you buy, check out a few different retailers to make sure you are getting the best deal on the exact model you want.
That 0% window is a hard deadline, not free money, and any leftover balance will get hit with standard interest once the 18 months are up.