Bob's Tip of the Day: Ceiling or wall radiant heating systems can usually be retrofitted with less disruption and at a lower cost than floor systems, which require ripping up and replacing an existing—and possibly expensive—floor. And depending on the panels used, radiant wall heating may need to occupy only the bottom four or so feet of wall, so installation is less intrusive. Whichever radiant route you choose, remember it will be effective only with proper insulation.