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After working here a few weeks and getting a crash course in ERVs and the Passive House, I have started to discuss these topics with family and friends. Most of them are blissfully carefree about indoor air quality. It is not that no one has heard of IAQ issues. They might know all about Radon. Many homeowners can name sources of formaldehyde and other VOCs too. So the obvious question arises: what then, stops someone in the know from properly ventilating their home? The most popular response: "Money. I can't shell out the cash at the moment." Don't despair, Green Builders, because while there is honesty in their responses, it's not entirely true. Many homeowners would rather buy a new TV or finish their basement; they find it difficult to prioritize the invisible. But if you could constantly see nasty air being forced down your throat, wouldn't you do something about it? These toxins are small and subtle enough that we do not perceive them on our own. When we say "passive home" styles we don't mean "passively poisoned."
OK, so sometimes you do smell stenches. Let's say that you do come home and your pet has left you a present. Or perhaps you'll return from vacation this summer to a musty odor. You can open your door, but as was explained to me my first week here, your nose stops smelling it after 5 minutes, no matter what. That's right, it’s not an open window or spray freshener. It's your body acclimating to the smell.
As a coffee fiend, I was immediately reminded of Starbucks. Their cafes exude a unique aroma. This smell is essential to the company's brand. Four years ago, they scrapped their egg-sandwich from the menu because its smell was overwhelming the traditional coffee bean scent. Needless to say, their customers raised a stink. This scent works so well because customers enter over and over again -- they grow to expect a certain smell. Because we are indoors 90% of the time we lose whatever scent there is. Whether we are coming, going, or just hanging around it is always there. It takes something like "Egg-sandwiches" to make us sit up and notice.
So what can we do about this? How do we convince ourselves and others to fix that we cannot sense? Not sure. However interesting, continuous discussion of IAQ is somewhat frugal amongst those already in the field. As an outsider, my best piece of advice is to find more like myself, and educate them however briefly on the importance of good Indoor Air Quality.
Please share this, and let me do some of the educating for you!
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The most common defrost strategy employed by manufacturers is known as ‘recirculation defrost’. This strategy temporarily allows the leaving air to be redirected into the incoming air duct to warm it up enough to keep the core from frosting. This cylce is generally 25-75% of an hour, every hour depending on outside temperature. NOTE- that while this is happening - there is no (or very little) fresh outside air coming in. This effectively lowers your fresh air ventilation rate... and turns your mechanical ventilator into a recirculation fan pushing air around for little reason.
UltimateAir has provided a pre-heat - pulse modulated solution that allows for no decrease in ventilation. This is the most efficient solution which ensures the fresh air required for the health of the occupants in the home. This is one of many other methods that best keep the incoming air at or above 12 F.
That is the short of it. Defrost is a fairly complex notion to discuss with regard to the cost associated with it. Know that UltimateAir has your health in mind first.
Contact UltimateAir for more details.
Window condensation is one visible manifestation of excess humidity, but ideal conditions also are found lurking out of sight within wall cavities, in crawl spaces and attics.