Share 'Determining CDD's and savings from AC downsize/upgrade.'
After running calculations on my furnace upgrade with inconclusive results I figure I would look at how much my AC upgrade really saved. yes my use was a LOT less in 2013 vs. 2012, but it was a lot cooler also.
Old AC: 1999 Carrier 12SEER 3 ton.
New AC: Thermalzone 14.5SEER 2 ton.
Same furnace with 3 ton drive used both years, blower switched from high to low speed when AC replaced at the end of…
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