Query: Is it okay to leave the furnace unclean for a while?
Context: While it's not ideal to leave your furnace unclean for an extended period of time, it's unlikely to cause any immediate harm to your health or safety. However, over time, dirt, dust, and other debris can accumulate inside your furnace, which can reduce its efficiency and cause it to work harder to heat your home. This can lead to higher energy bills and potentially costly repairs down the line.