When we purchased our unit the sales guy even said it would pretty much be a waste to install on both furnaces and I think he was right. Last summer was one of the hottest I could remember and the entire home was cooled throughout.
Coming from a house where it never got cool enough upstairs to one where it is definitely 19-20 in the bedrooms at night was a huge upgrade. Nice to still sleep under a decent sized blanket when it is 25 degrees outside.
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