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Buying guides

Short, practical notes on choosing and replacing common parts and supplies.

• How to choose an HVAC air filter MERV rating
  What MERV means, how to read your filter size, and how to balance filtration with airflow when picking a furnace or AC filter.
• How often to replace a refrigerator water filter
  Typical replacement interval for refrigerator water filters, how to find the right part number, and signs it is time to change the filter.
• Which battery does a smoke or CO alarm take?
  How to identify the right replacement battery for a smoke or carbon monoxide alarm, plus testing and replacement reminders.
• Septic effluent filter and alarm basics
  What a septic tank effluent filter does, general maintenance practice, and how high-water alarms help protect a pump tank or drainfield.
• Whole-house humidifier pad replacement
  How to find the right humidifier water panel or pad number and how often to replace it.