The furnace filter you have at home depot is the one that needs to be replaced. If it is doing its job as you expect it to, you don’t have to worry about changing it. If it isn’t doing that, however, you should get your furnace and replacement filters together. You will need a tool kit for that, and you should always use a professional for any type of plumbing or heating issue. Having the tools handy is important.
You should always ask for the tools first. There’s no reason to risk the job while you’re waiting for someone else to help you with your problem. When you’re done getting all the tools ready, have them all ready when you go in. Get the tools out and ready before you turn on the furnace to make sure you don’t forget anything. You don’t want to put in the furnace only to find out that you left something out.
The furnace filters you have at home depot aren’t what you need, because you are the one who changed them before you got your air conditioner. You should be the one to fix it when you have the time. Instead, they are the ones that are supposed to be taking care of the task for you. They can only do so much. Take care of the furnace yourself so that you can take care of it when you need to. You will be happier with the appliance when you do that.