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Bob meets with Mark Gallivan from Sears HVAC and Brent Morin from Morin Mechanical Services to review the heating system installation at the modular home project. The high efficiency, state of the art Hydro-Air system uses components of a traditional boiler, humidifiers, variable speed fans, electronic air cleaners and three exterior condensing units. Carrier manufactures many of the heating unit�s components including the boiler. The boiler produces hot water for both a forced air unit and a baseboard radiant heating system. The forced air unit allows for a consistent level of humidity in the house, that traditionally radiant-only units cannot accomplish, plus it receives the efficiency of radiant by employing a baseboard system. This gives the home�s occupants a more comfortable living environment. There are seven zones employed in the home�s heating and cooling system. The cast aluminum heat exchanger in this unit transfers heat three times faster than a traditional heat exchanger. The boiler uses a direct venting system that takes air directly from outside and vents it through a flue located in the center of the intake vent. This means no combustion gases are being mixed with the home�s interior air. The system�s zones can be turned on or off as needed, providing an added level of efficiency if the entire home is not being occupied at a given time.

Bob meets Mike Vogt from Access Industries in Kansas and some carpenters from the Whitaker Company who are installing a elevator in an accessible house in Roxbury, Massachusetts. They had to deal with finding enough space to place the elevator in the house. A closet space is used for the elevator and there is no penthouse on top of the elevator unit nor is there a pit in the ground which is pretty amazing because most elevators have one or the other. The elevator operates on rails in the rear of the unit. A sling package stops the elevator from falling if the cables accidentally break.

Bob joins Steve Bottazzi, a plumbing contractor, who is taking out an old boiler system and installing a new state-of-the-art system. The new system at 280,000 BTU is three times the strength of the old boiler and is smaller in size. It also serves as the heater for the household hot water tank. Steve shows Bob how he adds the manifold on each side of the boiler to direct the flow to the four zones in the original and new sections of the home. He also gives Bob a lesson on threading pipe.