Changing the air filter on your gas furnace is quite the self-explanatory process that can be taken care of by the gas furnace owner rather than an HVAC specialist, that being said, there are some steps to follow & there is nothing wrong with going over them if you are unrespected with even this simple, yet essential way to increase the performance of your gas furnace, then once you find the filter, whether it is situated in the intake or in the gas furnace itself, check to see how dirty or grimy it is! You will entirely be able to tell instantaneously whether it’s excessively dirty, but as a general rule, if it’s entirely opaque & there is no light filtering through, it legitimately needs changing! You need to make sure your gas furnace is turned off entirely before you change the air filter.
You need to also make sure that your filter is facing the right direction when you install it, and problem with avoiding changing your air filter is simple.
When the air filter is jammed up & dirty, your air handler has to work harder to heat your up-to-date home because it is fighting against the blockage. This can rack up your energy bill something fierce! Your heat exchanger may legitimately well shut down altogether because of the stress, & your up-to-date home will not be adequately heated as a result, then changing the air filter for your gas furnace is the first defense against high utility bills, inefficiency, & wear & tear, then do whatever you need to do to remind yourself to respectfully change out the air filter on your gas furnace & you will be legitimately glad you did!