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  • Noise Pollution

    The traditional definition of noise is 'unwanted or disturbing sound'.
  • Oriented Strand board (OSB)

    As with construction-grade plywood, it can often be used in a healthy house if it is well-separated from the living space.
  • Passive Solar

    A home-energy alternative or addition to gas and utility electric.
  • Perchlorate

    As a pollutant, perchlorate is found in groundwater, surface water and soil and has proven to be a pervasive contaminant of agricultural and manufactured food products.
  • Phosphates

    Once widely used to soften water for use in washing machines, some makers have reduced use of these chemicals.
  • Pier Foundations

    Often used in hot, humid climates, a pier foundation lifts a house up off the ground reducing health hazards from direct soil contact.
  • Polyurethane and polyisocyanurate

    Polyurethane can be a flexible foam, as used in upholstery, or a rigid foam, as in insulation.
  • Pressure Washer

    They’re great outdoor cleaning tools, but they can cause severe injury or damage if misused.
  • Preventive Maintenance

    A preventive, systematic approach to health, safety and comfort is a homeowner’s best defense against poor air quality, unexpected breakdowns and expensive repairs.
  • Radiant Cooling

    Radiant cooling cools a floor or ceiling by absorbing the heat radiated from the rest of the room.
  • Radiant Heating

    Forced air heating is not the only option.
  • Radon

    A naturally occurring radioactive gas, often released from soil and rocks.
  • Range fan

    The hood has a removable filter that’s essential for reducing airborne grease.
  • Recycling Symbol, Plastic

    How to “read” plastic containers for recycling.
  • Relative Humidity (RH)

    The amount of moisture in air compared to the maximum amount of moisture that air at that temperature can contain, usually expressed as a percentage.
  • Sealed Combustion

    A system in some furnaces, boilers, fireplaces, and water heaters that is immune to pressure imbalances in a house because it draws combustion air from the outdoors into a sealed chamber and expels by-products to the outdoors.
  • Sensible Heat

    The amount of heat involved in raising or lowering the temperature of air, not including any heat required to cause water vapor to change state (e.g. from a gas to a liquid).
  • Spray-On Insulation

    Insulation products that start out as a liquid, but end up as a solid.
  • Terpene

    Terpenes are hydrocarbons - organic compounds made up of hydrogen and carbon - mainly from plants, and the main constituent of essential oils.
  • Total Dissolved Solids (TDS)

    Total dissolved solids are dissolved particles found in water that are small enough to pass through a .45 µm filter.

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