Just this year picked up a used tractor with a cab but without a heater. Purchasing a kit for a curtis cab heater was going to run me about 500 dollars so I took a chance on purchasing a golf cart heater and the thing really works well. The fit in the cup holder is very snug so there's no wobbling and it heats things up pretty quick. Usually I start the tractor to warm it up, fire up the little heater, then go shovel the walks and in front of the garage doors. By the time I hop back in the cab is warm and the little 20 dollar fan I bought off amazon is keeping the windshield from fogging.