Just got a new system installed (all Ruud):

* UGPN07EAMER furnace (has slot for 1" or 4" filters)
* RCFLHM3617AC coil
* UANL036JEZ condenser (3 tons)

I'd like to get better (cleaner) air in the house, and was thinking about the 3M Filtrete line, but then I read that it's too restrictive and may not be well matched to all systems. How do I find the best combination of filtering ability vs. pressure drop?

If it matters, it gets above 100F here in the summers, but I keep the thermostat set around 80F indoors. Thanks.