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• Air watt

  This standard measures the cleaning power of a vacuum cleaner.

• Relative humidity

  Even humidity is relative.

• CADR

  Look for these numbers when comparing portable room air cleaners.

• Air cleaner

  There are several different types, but these useful appliances are no substitute for good cleaning and other preventive measures.

• MERV

  A standard for rating heating and air-conditioning filter efficiency.

• Ventilation

  Another word for “airing the place out,” ventilation is one of the top three ways to improve indoor air quality.

• Room air conditioner

  Cleaning this appliance is best done in autumn.

• Furnace

  Replacing or cleaning the filter each month is key.

• Central air conditioner

  Keep components clean — you'll reduce dust and save energy.

• Duct

  These metal conduits distribute heated or cooled air from a furnace or central air conditioner. No one’s sure whether they need regular professional cleaning.

• Vacuum system, central

  These powerful units offer many advantages over upright and canister vacuums.

• Air filter

  All forced-air heating and air-conditioning systems have HVAC filters.

• Fabric filter

  A fancy term for a wide variety of dust catchers.

• Environmental agents

  What the scientists mean when using this term.

• Humidifier, whole house

  Basic tips follow on keeping your unit in tip-top shape. Don’t have one? You might not need it after all.

• Vent, heating and air conditioning

  Regular vacuuming is a must. Here are some other tips.

• Humidity

  What this term means for a clean, healthy home.

• HEPA

  A term relating to filter effectiveness. HEPA filtration removes 99.97 percent of all particles 0.3 microns and larger.

• Humidifier, portable

  It helps if you hang onto the instructions. Here’s what to do if you can’t find them.

• Heater, portable

  If it has a plug, make sure it’s nowhere near an outlet before cleaning.

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