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Indoor Air Quality
Filters, humidity, ventilation and ductwork — the parts of comfort you cannot see.
Indoor Air Quality
MERV ratings: choosing a filter without choking your system
What the rating really measures, and why the thickest filter is not automatically the best one.
Indoor Air Quality
Whole-home humidifiers: comfort, woodwork and air quality
What a humidifier adds in a dry Raleigh winter, how it is controlled, and the maintenance it needs.
Indoor Air Quality
Duct cleaning: when it helps and when it does not
The cases where cleaning makes a measurable difference, and the marketing claims that do not hold up.
Indoor Air Quality
Indoor humidity: the range that keeps mould away
Why damp air costs more to cool, how to measure it, and when to dehumidify instead.
Safety note. Gas smells, repeated furnace shutdowns, burning smells and suspected carbon monoxide are call-out situations, not do-it-yourself jobs. Leave the building and contact a licensed technician or your utility. Refrigerant handling and gas pipework are licensed trade work.