i was gonna get the heater craft 300 pro, comes with everything needs, and i was going to mount it in between both motors so that i can run a vent hose and vent to the forward face of both seats, puts out 40,000 btu and i think it would definitely take the chill outta the air with the drop curtains closed. They only issue i see is that i'll only be pulling heat from starboard motor so i'll be running up the hours on that motor in spring time but i guess i can just get them to even out in the summer.