Just like customers expect a doctor to be an expert in health care, a lawyer to be an expert in law, and a banker to be an expert in finance, they expect their HVAC technician to be an expert in IAQ.

Humidifiers can treat a range of winter symptoms, including cracked skin, scratchy throats and nosebleeds — but only if you use them correctly.

Allowing cold, dry outdoor air to leak into the home will reduce the humidity indoors. Appliances, like the furnace, AC, or fireplace, can remove moisture from the air, causing it to feel dry. Overuse ...