There are a number of factors that 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 that can affect that level.
One of the biggest factors affecting the humidity level in a home is the changing of the seasons. Summertime brings many of us to open up the windows throughout the house from early spring through the summer months and into the fall season bringing the humidity to the same levels as the environment's relative humidity levels. The late fall heavy rains will also be felt considerably cooler and uncomfortable. Summertime also 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 or rivers will be subject to higher humidity levels as will coastal areas where homes will endure more humidity than homes built inland thus farther away from large bodies of water. The treatments around the foundations of a home can also affect the level of humidity that will seep through and inside the home.