What I see as the main benefit is apartment housing and commercial properties being forced to improve. For most of us in our own homes its a no brainer. For rentals it seems energy cost is something to pass the buck to tenants while the owners get by with the cheapest solutions. The usual cost difference between 13 and 14 seer is $200-300. Over the lifetime of 12-20 years that can be a huge difference in operating cost differed.
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