Everything you read online about furnaces says you should regularly clean them.
If you leave a furnace dirty, then havoc ensues.
A dirty furnace can easily overheat and catch on fire. The air filter can only stop so much dust from going into the system. Once the dust gets in the inner workings and the surance struggles to maintain heat, there is your fire hazard. Another possibility is carbon monoxide. While the furnace strains to achieve the thermostat setting, the heat exchanger can crack. This releases carbon monoxide into the home, which is a tasteless, odorless, and poisonous gas. The only way to detect it is through a carbon monoxide detector. The only way to avoid it is with regular furnace cleanings. I am on top of it with furnace service. I have a Terrell, Texas furnace repair and service supplier that is amazing. They show up on time and do routine maintenance once a year. They check for dust, rust, and coercion. They change my air filter, clean the inner workings, and inspect every itn top to bottom. Typically they find nothing. This most recent time there was just a small worn part. It only cost me about 300 bucks for the part and labor. I was glad to pay for it. I feel anytime they catch a furnace repair is ideal. That part could have easily graduated into total system failure. It is almost better when they catch something. That way I can justify it in my head that my furnace service is a smart investment every year. I love all the benefits I get from it.