The radiant tubing is then attached either through stapling or radiant joist tracks from underneath. A high temperature tubing will need to be used because hotter than normal temperatures will be required for the heat to penetrate through the subfloor and whatever other floor coverings exist above. Radiators can be installed in rooms as an alternative to staple up distribution. Some radiators are the long baseboard type and others are boxier. Air handlers with heat exchangers can be installed to use the old ductwork with the new hot water heat system.