Air & humidity - Page 10

At home

The filter that wasn't in the furnace

A short maintenance visit to the ventilation unit that is easy to overlook.

At home

The annual duct-cleaning offer

Distinguish a dusty grille from evidence of contamination inside the duct system.

At home

Before the smoke advisory arrived

Check filters, cooling and a cleaner-air room before supplies and time become scarce.

Filter changes that actually help (and the ones that don't)

MERV ratings are a marketing minefield. We use MERV 11 or 13, and one marker habit prevents 80% of the call-backs we see.