Carrier with 1 blue, 1 yellow wire. Easy fix, yes????? After taking another look, it appears (hey..I'm a novice) the "serious" voltage is encased in a conduit sort o' tube rnning into the "fan housing-radiator looking device" and the wire(s) in question run in a brown 3/16 diam jacket from inside the house along side insulatted pipe, and then are seperate (3") 1 bl, 1 yellow. MAYBE some sort of ground? If it's "simple" I'd prefer to hook 'em up before buying a service call, ya know? THANKS!

I have two fairly new AC (one is Trane 13 sheer replaced in 2008 and another is Trane 15 sheer (new type of coolant) replaced in 2010). Home Depot sells FPR rating 5, 6 and 7. There are huge differences in pricing. For example FPR 5 costs 2.50 a piece but FPR 6 or 7 costs 9.0 a piece. If I use the most expensive, I need to buy 8 of them a year (every 3 months for two AC). that's $72.00. But least expensive ones will cost 1/3 of that. I have been using FPR 7 which says if you are allergic to small particles, use it. Since we are not allergic to anything, I'v purchased FPR 5 and wanted to start using these for cutting cost. I went through my AC documents, they don't say which rating to use. Rather they say use the same filter which was provided by the installation dealer. For me, they didn't even provider filters. So I wonder if FPR 5 is sufficient for my AC (TRANE) I appreciate any comments.