My HVAC airflow journal 254

For a lot of households, allergies do not feel like a seasonal inconvenience. They feel like a daily tax on sleep, focus, and comfort. People notice it first at home, where the air should feel easiest to breathe, yet sneezing starts after the furnace kicks on, eyes itch more in the bedroom than outside, and dust seems to return almost as soon as the vacuum is put away. That is usually when the conversation turns from medication to the house itself. More specifically, it tur

Indoor air has a way of disguising itself. A home can look spotless and still carry cooking residue, dust, pet dander, mold spores, combustion particles, and the lingering chemistry of cleaners, paints, and furnishings. People often notice the air only when something changes, a bedroom starts triggering congestion, a renovation leaves a gritty film on shelves, or an office develops that stale, tired smell that never quite goes away. By then, the problem is usually not one t