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• 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.

• Humidifier, portable

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

• Humidity

  What this term means for a clean, healthy home.

• 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.

• Relative humidity

  Even humidity is relative.

• Furnace

  Replacing or cleaning the filter each month is key.

• Air filter

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

• Bathroom fan

  Exhaust fans aren’t just for keeping the bathroom from smelling bad.

• Environmental agents

  What the scientists mean when using this term.

• Radiator heating system

  Cleaning is straightforward when you think safety first.

• Carbon monoxide

  You can’t see it, smell it or taste it, but that doesn’t make it any less deadly.

• MERV

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

• Air cleaner

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

• Television

  These appliances attract a lot of dust. Here's how to prevent or remove it.

• Radiator, baseboard (electric)

  For safety’s sake, cut power to these units before cleaning them.

• Grease, airborne

  Prevention is at least as important as cleaning here.

• Vent, heating and air conditioning

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

• Radiator, baseboard (forced hot water)

  Regular dusting and vacuuming will make them look better, and they’ll work better, too.

• Central air conditioner

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

• Oven, conventional

  Clear winner of the Worst Job in the House Award.

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