Fresh air or Granite counters?

July 29, 2010

heat-recovery ventilatorDoes the quality of air in your home rank up there with the finish level of your counter tops? Maybe it should. To certify a home for even the basic level of Green or Performance building certification, a fresh air exchange is required. This is usually a fan in a utility room that is just blowing out stale air from the interior of the home and pulls in fresh air from the exterior. The downside to this is that on a 30 degree day, it is pulling in 30 degree air to your already comfortable 72 degree home. This makes your furnace work extra to heat up this cold fresh air. In addition, these fans are not balancing an equal amount of air being pulled from the home with an equal amount of air being drawn in. This can pressurize the home, potentially pulling air through unintended areas.

What you should be asking your builder for is a Heat-Recovery Ventilator or HRV. The HRV also brings in that 30 degree air, except it uses the heat in the outgoing stale air to warm up the fresh air. Depending on the model, HRVs can recover up to 85 percent of the heat in the outgoing airstream, making these ventilators a lot easier on your budget than opening a few windows.

Using a small fan, the HRV system maintains a continuous flow of filtered outdoor air in the home. To avoid pressurization the system removes an equal amount of stale, used air from the home, especially the kitchen and bathrooms where moisture and odors are heavy. These systems can change the entire air system in a home in under 3 hours.

HRVs are ideal for tight, moisture-prone homes, like here in the Northwest, because they replace the humid air with dry, fresh air. That is why an HRV is a standard feature in every Marnella Home. For the long term health of your family and home, shouldn’t you expect this of your next home?

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