I do not understand why people delay or refuse to use carb heat. Before decent if conditions are anywhere close to carb ice conditions, pull carb heat while still at cruise power before retarding throttle. You don’t have to wait till downwind to apply carb heat, at 5 to 10 out you can apply it if conditions dictate. If you don’t have a carb temp gauge it is either full or none, as partial can cause ice at lower temps. Caution zone is: Temps 30-70F, temperature-dew point spread within 3 degrees, visible moisture, high humidity, clouds, rain, mist and/or induction system that pulls from outside the cowl like cessnas. If any of these are present then be thinking carb ice. Been there done that, don’t wait til it is too late. Carb heat when not needed is OKAY, no carb heat when needed is not OKAY. Fly safe.