The heating, ventilation, and air conditioning (HVAC) systems that keep your home from being a scorching desert in the summer and a desolate tundra in the winter can make you a happier, healthier person, or not, depending on how you operate them. Effective ventilation enhances our physical and mental health, which is no surprise, because logically shouldn’t “breathing better” do just that? The single best thing that you can probably do to breathe mind, body, and mood elevating air is…