Mini Split cost comparison to heating oil with New Englands expensive electricity
I am trying to compare heating oil cost against running 2 12k mini splits in CT. Electricity is really expensive here in CT at around almost .25kwh delivered. I do have a 5.4kwh solar array but would still need to purchase some power to run them through the winter. I have a forced air 90k carrier oil furnace that is ridiculously oversized for my 1600 sq ft house. I have been using this fuel cost calculator to run some numbers and it appears to be significantly cheaper to run the mini splits. One thing I am not sure is the accuracy of my HSPF number. I remember reading the HSPF number is for something like Atlanta. How would I convert my 2 mini splits to a number for New Haven CT? I have a gree sapphire 12k wall unit with a hspf of 15 and a midea console with a hspf 10.5. I sort of went with 13 to split the difference between my two splits to get a rough number but am guessing its much lower.
There is a hspf chart on the fuel cost comparison spreadsheet but it seems confusing. Do I assume Bridgeports number of 6.9? That seems really low.
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