[Golf-Tinker]

The Coleman unit (which I purchased last fall) available from Ace Hardware has two levels of heat selection. Useful when the high heat output makes the cart interior too warm. Caution note: never direct the heat toward the cart windshield. Also be aware of side curtains flapping in the wind and touching the heater.

As noted in a previous post, the cup holder adapter can be wrapped with electrical tape (I use a piece of cardboard) to hold it securely in the cart's cup holder.