Did you ever learn how to change a tire or change the oil in your car? There are tasks like these that certain people can do themselves (with the proper information of course). But just because you know how to change the oil in the car doesn’t mean you never take your car in for professional repairs when something bigger pops up.
The same idea applies to your heater. While you may not need a professional for a filter change, you should reach out to a pro for just about any other major heating service in Fort Mohave, AZ. Much like with your car, getting service from a professional is going to cost more but also be more beneficial in the long run.