It is technically possible to operate a furnace without a filter for a short period of time. However, it is important to emphasize the word “temporarily” here. For example, running a furnace without a filter overnight isn't likely to cause any problems, but it should never become a long-term solution. The air filter in your furnace serves an important purpose.
It filters out airborne contaminants, not just for air quality, but also for the furnace itself. If you run your furnace without an air filter for an extended period of time, it can cause damage to the system and reduce its efficiency. If you need to run your furnace without a filter for a day or two, it won't cause much harm. However, if you allow this to become a long-term solution, you risk damaging your system and the health of your family.
The air filter also plays an integral role in the successful and continuous operation of your furnace. If you decide to run the furnace without a filter for more than one or two days, there may be minor problems such as more dust than usual in the air or leaking through the vents. In addition, without a filter, everything in the air will continue to circulate around your home so that everyone can breathe. This can lead to an accumulation of dirt and debris inside the furnace, which can cause it to work harder and reduce its efficiency.
It is important to understand which heating system is best for your home in order to choose the best air filter for your furnace. It is also important to replace the filter regularly in order to keep your furnace running smoothly and efficiently. Simply put, running your furnace without a filter is the fastest way to reduce the air quality in your home and will cause damage to your system. Whether it's dirty coils or a dirty filter, the furnace will have to work harder to achieve the results you want.
The filter prevents this from happening, so it's important to have a filter in the furnace at all times.