You didn't indicate whether the depth was 1" or 4". If 4" depth, once a year is fine unless you have some extraordinary situation. For 1" depth, every 3 months is fine.
Quote:
Originally Posted by MikeVillages
Furnace/AC filter change interval?
Your info/comments and questions?
INFO:
Filter size: 16x25
Filter MERV: 10, what the previous owner used.
Square feet: 2000.
No pets:
Occasionally open windows for fresh air.
We usually keep the AC temperature @ 79 as we find that comfortable. The furnace temperature is set much lower.
We usually change around 6 months but think we could go longer.
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