Key takeaways
- One-inch pleated filters usually need changing every one to three months.
- Deep media filters often last six to twelve months.
- MERV 8 to 11 suits most homes. Higher ratings need a system that can handle the airflow.
- A dirty filter raises energy use and can freeze coils or overheat furnaces.
The simple schedule
As a rule, check a standard filter monthly and change it every one to three months. Homes with pets, allergies, construction dust or heavy use need more frequent changes. Deep media filters in a cabinet often last six to twelve months.
Mark the date on the filter and set a calendar reminder so it does not slip.
Choosing the right MERV
MERV measures how small a particle a filter can catch. MERV 8 to 11 is a good balance for most homes. Higher numbers catch smaller particles but resist airflow more, which can strain a system not built for it.
If you want better filtration, a deep media cabinet gives high filtration with less airflow resistance.
Why it matters
A clogged filter makes the blower work harder, reduces airflow, raises energy use and can freeze the cooling coil or overheat the furnace. Regular changes are the cheapest way to protect your equipment.
Make sure the filter fits snugly, since gaps let dust bypass it.
Related services
Quick answers
What size filter do I need?
The size is printed on the edge of your current filter, such as 16 by 25 by 1. Use the same size.
Can a higher MERV filter hurt my system?
It can if the system cannot handle the extra resistance. Ask us before moving to a higher rating.
Ready to talk it through? Get a free estimate or call 615-431-3789.