A custom cover for a radiator, installing a steam humidifier on a forced-air heating system and portable units that don't require any installation.

General contractor Tom Silva shows host Kevin O'Connor how to build a custom cover for a radiator. Then Tom and Kevin, along with plumbing and heating expert Richard Trethewey, ask, "What is it?" Richard helps a homeowner install a steam humidifier on her forced-air heating system. Back in the loft, Richard also shows a number of portable units that don't require any installation.