We recommend changing your air filter every 30-90 days.When ever your filter is dusty it probably is the time to change it.
When your heat/air is not coming out or seem to not function right,check your air filters.If they are clogged up that may be the problem.
When close should my furniture be to my vents? The recommendation is between 6` inches and 1″ foot.
Never have your vent suffocated!! Either way,so it can’t suck in or push out!!