There are a number of factors which can affect the humidity level in your home. Keeping the humidity at an even level is vital to not only if you are growing plants, but also if you want to preserve pieces of furniture, or avoid problems such as mold. If you are keen to regulate the humidity level in your home, then you should be aware of a number of factors which can affect that level.
One of the biggest factors affecting the humidity level in a home is the changing of the seasons. Summer time can bring a lot of heat to the floors of a room, and this can result in condensation rising up from crawl spaces. In winter, the drying effect of a central heating system can cause the humidity level to drop.
Your location can also contribute to the humidity level of a home. Different parts of the country have different levels of humidity, and different positions in the local area can also affect the moisture inside your home. Buildings near natural water, such as lakes. springs or rivers will be more humid than homes near to the center of town (with increased warm air). The foundations of a home can also affect the humidity.