With the changing climate and seasonal health issues like flu and colds, it is not unusual that most people get sick or irritated because of the damp weather. Worse, allergies are triggered with the weather shifts; we personally wish we can get dehumidifier to breathe cleaner air.
Somehow, it helps to let the windows open once in a while to let the damp air clear the place and when allergies fill the house, it is only wiser to remove the cause of these allergies. These may include dust, pollens, pet's hairs, food among others.
So, if the house does not let in much fresher air, a renovation can be a viable option. A consultation with a home improvement expert, an interior designer or architect can further help you make better designs.