If you must ventilate during construction, change HVAC filters often.

During construction (renovation or new construction), building air is full of dust and volatile organic compounds (VOCsVolatile organic compound. An organic compound that evaporates readily into the atmosphere; as defined by the U.S. Environmental Protection Agency, VOCs are organic compounds that volatize and then become involved in photochemical smog production.).

So, it’s best not to run the HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. system at this time. Just, seal the openings and leave the system off until work is complete.

If you have to ventilate, however, use HEPA (high efficiency particulate air) filters and change them as needed during construction, especially prior to occupancy. If not, ducts, plenums, and grilles can become contaminated providing food for mold. This affects building occupants and reduces the air-moving capability of the equipment.

Green points

LEED for HomesLeadership in Energy and Environmental Design. LEED for Homes is the residential green building program from the United States Green Building Council (USGBC). While this program is primarily designed for and applicable to new home projects, major gut rehabs can qualify. : 1 pt. for sealing ducts and vents to minimize contamination during construction; 1 pt. for flushing the home with fresh air prior to occupancy

Learn more in the Green Building Encyclopedia

FORCED AIR