How Much To Replace Furnace Filter. The filter is often located within the return vent but sometimes fitted directly to the furnace assembly itself. The harder your furnace has to work, the more expensive your utility bill will be.
The harder your furnace has to work, the more expensive your utility bill will be. Unfortunately, replacing a heat exchanger is one of the most expensive furnace repairs, typically costing phoenix homeowners anywhere from $1,500 to $3,500. This is thanks to the fact that dirty furnace filters prevent a steady stream of air from passing through the system and into your living space.
I’m guessing they had to cut down the blue filter to fit a custom size return duct.
It is very important to clean or replace the filter on a regular basis to maintain peak system efficiency. The most common and easiest way to see if you need to replace your furnace filter is to determine how much time has passed since you last changed it. A dirty filter reduces airflow causing your system to work harder to circulate the air. If the air filter is not serviced often enough, it will eventually become clogged to the point that air cannot pass through it.