#4: Check furnace filters every three months and replace when dirty.
Cost: $3–$6 Savings: Varies*
Check your furnace owner’s manual to determine the location and size of replacement filters that you need.
The size will also be indicated on the old filter.
Steps:
Simply slide the old filter out and the new filter in.
If your furnace filter is reusable, clean and replace.
*Individual experiences may vary, check with PGE or your retailer for more info.
