Is your basement floor wet near your furnace/ac?
If you ever have went into your furnace/ac room and found a wet floor there could be a few different reasons. Possibly a leaky hot water heater, or a clogged ac condenser drain line, but many times if you have a humidifier on your furnace it will the furnace humidifier filter. The furnace humidifier filter is probably one of the most overlooked maintenance items in a home. This is not really for good reason, because they are easy to change and fairly reasonable. Ideally it is best to change your furnace humidifier filter every 3 months of running time, but most manufactures recommend changing at a minimum one a year. So if you have a humidifier on your furnace remember that this is a simple, low cost maintenance item.