Anonymous
Post 01/12/2026 21:47     Subject: How often do you change your HVAC filters?
When I think of it which seems to be every six months. I'll try to do better, sorry.
Anonymous
Post 01/12/2026 20:24     Subject: How often do you change your HVAC filters?
We have 1 very thick filter. We change it 2x a year ..before heat goes on and before AC comes on.
Anonymous
Post 01/12/2026 19:54     Subject: How often do you change your HVAC filters?
Every 3 months. 2 filters, one up and one down.
Anonymous
Post 01/12/2026 12:04     Subject: How often do you change your HVAC filters?
Anonymous wrote:What does the manufacturer suggest for your furnace make and model? This isn’t a crowd source question.


It has more to do with the filter and air quality inside the house. The only way to know for sure is to check the pressure drop, which is easy to do. I change my 1" thick filter every other month. A 4" filter will last a lot longer before the resistance gets too high.