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Whole-House Exhaust System. Indoor air is continuously exhausted to the outdoors with one fan often located in the main hallway. Because indoor air is continually drawn out, the home becomes slightly depressurized unless windows are opened. These systems are best used in the Spring and Fall, when stale air can be exhausted while bringing in fresh cooler air. There are two problems with these systems:
1. If you suffer from outdoor allergies, outside air can be your worst enemy. Please see Air Purification and Air Filtration. Life doesn’t have to be miserable in your own home.
2. These systems are typically not appropriate for hot, humid climates, which is common in our area. You run the risk of drawing hot humid outdoor air that may cause moisture problems. In the Greater St. Louis area, moisture problems may lead to mold issues. Our area is best supported by the Lennox Energy Recovery Ventilator (ERV). With the ERV, equal quantities of air are brought into and sent out of the home. This is usually achieved using two fans—one to bring fresh air in and another to send indoor air out. ERVs transfer heat and moisture between the exhaust air and incoming air. This provides additional savings in the summer by reducing the moisture content of the incoming air that would otherwise have to be dehumidified with the cooling equipment or a dehumidifier. ERVs also provide additional comfort in the winter by adding moisture from the outgoing air to the incoming air to help avoid excessively dry indoor conditions. Click Lennox ERV to find out more on how this system can help your stale air problem.
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