Plumbing and heating expert Richard Trethewey and host Kevin O'Connor install a ductless heat pump to heat and cool a bonus room. Then, Richard, Kevin, landscape contractor Roger Cook and general contractor Tom Silva ask, "What is it?" Afterward, Tom shares a viewer tip for driving eye screws. Then, electrician Scott Caron demonstrates new technologies and applications for LED lighting. Then, Roger learns how to select houseplants for different situations.