Switching to induction changes how you use your kitchen every day. You get water that boils in ninety seconds and a surface that wipes clean because it never gets hot enough to bake on spilled food. Labor Day is the sweet spot for these upgrades because retailers are desperate to move inventory before the winter holidays.
Before you buy, you need to check your power. Most induction units require a dedicated 240-volt circuit which your old gas or electric stove might not have. Get at least two quotes from electricians in August so you know the total cost before the sales start.
This 18-month window is a deadline, not a suggestion. If you have not paid the full balance by the time the intro period ends, you will start owing interest on whatever is left. Stick to the monthly schedule to keep the borrowing cost at zero.