thanks for all the help you've provided me over the years. I am planning to take out a bay window and put in a french door. I'll lose about 6' of existing base radiator in the process. what's the best way to recover this amount of heat? Do i reroute copper radiator piping along 6' of adjacent interior wall? ( 3 feet on each side of the new french door). I don't want a step to get outside. I want to step over only the door threshold. Or possibly have an in floor vent in front of the thresholds by notching (and doubling) existing floor joists? or something else? thanks