If your home feels stuffy and humid, if condensation collects on the windows, the bathroom shows signs of mildew, or smells linger, your home could be under ventilated. If you’re heating and cooling costs seem higher than they should be, if your home feels drafty, you may have too much ventilation or air leakage. When your home is properly sealed and ventilated to the appropriate airflow, you should not experience any of these problems. Helpful tip! Trust your nose, but not for long! Everyone has experienced “olfactory fatigue”—you notice a strong odor—sometimes pleasant like cooking or baking or perfume—or an unpleasant smell like stale smells left from yesterday’s dinner, smoking, etc, but within several minutes, you are no longer aware of the smell. To test your home, after a vacation or even a long walk, pay special attention to your first reaction when you return. If the home seems fresh—great. If not, you can be sure you need some form of additional air change to maintain a healthful environment. So we say—trust your nose, but not for long.