I sold my CYV that used Duke at the end of last year. That said, the electric bill ran $165-180 during the summer and typically right around $100 most of the rest of the year.
It had a 2007, 3 ton Trane HVAC system.
We currently live in a different CYV and this one needed more attic insulation as the bill on Seco was upwards of $250-$275 or so during the summer months.
Adding insulation and getting a Heat Pump water heater brought the bill down in July to under $200. This is Seco though, your mileage may vary on Duke, but since you did your windows, it's possible you need a refresh on your insulation up top. We used the Solar guys and it wasn't really that expensive to add 8 inches of blown in insulation.
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