When it comes to the acronym ‘HVAC’, most people refer only to the ‘H’ (heating) plus the ‘air conditioner’ (air conditioner), then but the ‘V’ (ventilation) is pressing too – especially with new homes, which are built tighter than ever; Energy codes require higher levels of air sealing plus blower door tests to verify air tightness; And tight homes need mechanical ventilation, especially in bathrooms, then imagine stepping out of a nice sizzling shower, wiping the mirror with your towel in order to see yourself! Of course the sizzling steam produced the foggy mirror, but where does the excess moisture go? Without correct ventilation, it goes behind the walls, the tiles, plus the floor, all of which can lead to mold plus mildew. Any HVAC serviceman worth his weight in salt understands the importance of correct ventilation fans that protect against the harmful effects of the mold plus mildew… They understand that a fan does more than just remove steam; Proper ventilation needs to be powerful enough to remove all of the steam. And if a bathroom is not located on an outside wall, an HVAC business can absolutely run ductwork to remove the moisture, then finally, an HVAC serviceman should offer a brief explanation of how long to run the bathroom fan in order to respectfully ventilate bathrooms, then most people leave the fan on only while they’re still in the bathroom. But the best practice is to leave the fan on for up to an hour in order to respectfully ventilate the room. A ventilation expert should emphasize that by venting out the excess moisture, you are easily contributing to your family’s health. And if you can’t stand the noise that the bathroom ventilator fan makes, for a few extra dollars, you can have a quiet bathroom ceiling fan installed.