I am planning on installing a new furnace in my house soon. I would like opinions on what filter thickness/merv rating I should plan on going with.
I am looking for the best all around combination of not too restrictive, good at insuring that my heat exchanger/evaporator stay clean, low cost, etc. I am not looking at trying to turn my house into a clean room, I just want something that will do a decent job at a fairly inexpensive price.
I don't necessarily care how often it needs to be changed. What I am wondering about is how much of a difference do different sizes/merv ratings make on how often a filter needs to be replaced, and what the overall cost would be? For example, which filter would be least expensive per year, a 1" pleat that needs to be replaced every month, a 2" that needs to be replaced every 2-3 months, or a 5" that needs to be replaced twice per year?
Also, what is the best place to get air filters. Should I get them from a place like Grainger or J-Stone, or should I check into online sites like Amazon or a dedicated filter place?