I have a 21 year old Nordyne unit. It is a 10 or 12 SEER 3 Ton HP. I will be down sizing to 2 Tons and am wondering if getting a staged unit or an inverter unit is worth the cost over a standard single stage? I currenly live in Roanoke Va and have a 1972 ranch style home and the Unit is located in a vented attic. I have no plans to foam in the attic but I have been actively air sealing conditioned space bit by bit. My home has no shade trees directly over it and faces East so it gets full sun on all sides excecpt the north side which gets sun VERY late in the day if at all. My electric bills are averaged around $190 a month with a yearly consumption of electric KW ~22k or ~1750 per month. A basic load calc comes in at 1.85 tons and right at 1.5 tons if I were to change my orginal windows for something newer such as double pane and add in a proper amount of attic insulation.
I have a finished basement but Im pretty set on adding in minisplit to heat and cool it. Im guessing around 9k BTU but even a 6k BTU maybe oversided.
I also am interested in burying my flex runs in the attic insulation. I have read up on it but I think they are too far from conditioned space and I think my area maybe slightly too humid but IDK. Need help on that also.
My #1 goal is to have a comfortable home but also lower my electric bill enough so I get a nice ROI in a few year or 10 at the most.
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