Heating and cooling system controller; re-grouting a tile floor

Plumbing and heating expert Richard Trethewey makes a HOUSE call to California to help a homeowner install a new type of "zoning" controller for her forced-air heating and cooling system. Then Richard host Kevin O'Connor, general contractor Tom Silva and landscape contractor Roger Cook ask, "What is it?" Later, Tom helps a homeowner re-grout the tile floor in her master bathroom.