Your utility rates are quite cheap. We are happy when elec is 10 cents KWH. Here we try to keep the summer elec under $200. Course 105* and forecast 111* tomorrow. Supposed to cool to mid 90s next week.
Personally with your house I'd go straight ac coil and condenser and spend that 1K on insulation and air sealing as it will return way more than the unit will.
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