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If it is R-401A it is at least 13 SEER / 7.7 HSPF. 2 Megawatts per month seems like a huge amount of electricity for a relatively modern unit. Have you checked your ductwork? That can be a huge source of leaks. When I went under my house with the home inspector for a prepurchase inspection we found 2 out of 6 vents completely disconnected. The tape had aged and cracked.
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