Bob is in Melrose where John Ambrosino of Total Temperature Control installs the new heating, ventilation, and air conditioning (HVAC) system. Because of clearance issues, the unit is installed horizontally and tied to the joists with steel rods. Ambrosino explains how the unit pulls air in for exchange, to be heated or cooled, then pushes it through a fan and into the ducts for circulation. The 16 SEER unit is very big for maximum efficiency, quiet operation, and up to 45 percent savings over current energy costs. Mark Hagan shows Bob the Trane CleanEffects whole-house three-stage air-cleaning system that cleans the air of 99.98 percent of particulates, filtering first for large particles, then charging the small particles and capturing them in a collection filter for healthy indoor air. Don Adams of Bond-Tite Tank Service shows Bob how they move the oil tank, reattach it, set it in a trough to catch leaks and drips, and apply Tank-Guard to isolate condensing water and prevent tank corrosion. Bob talks to Howard Brickman about how to control squeaking floors either by drawing the wood floor tight against the subfloor with screws, connecting blocking to the joists and subfloor from below, or shimming the space between the subfloor and joists.