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I've been told I need to change the filter on my attic furnace. However, I am not able to locate the filter or an access panel that would house the filter. Image attached is a view of the furnace. Any suggestions appreciated!
 

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My attic furnace doesn't have any filters in the furnace. The filters are located in the cold air return grills.

Check behind the grills to see if ours are likewise located.
My grills are hinged. You remove two cap nuts and they swing open for access to the filters.
 

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It would be on the return air end of the furnace, if it’s in the attic. May be in a return grill.
Your gas furnace will require seasonal maintenance as well. Just like a filter change.
 

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if you just bought the house, get the equipment checked to establish a basement.

It's not just a question of cleaning -> furnace and a/c need to be properly tuned, don't assume what you have is set up properly.

For heating btu input and airflow/temperature rise
For cooling, airflow and refrigerant charge.

The furnaces come from the factory set to use high speed for cooling which isn't always correct for the smaller units. Dehumidification suffers when airflow is too high. As well, refrigerant charge can't be properly set if the blower speed is wrong.

1.5 ton units are affected by this the most with even 40k furnaces coming with at least 2 ton rated blower.
 

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*establish a baseline, not basement.
 
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