Assuming you don't have natural gas I would say 2 x 1500 watt heaters on different circuits should be enough if you have insulation and don't expect 20 C.
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'58 356A coupe, just a driver
'00 Boxster S fair weather - daily driver
'11 Jeep Grand Cherokee Limited - winter daily driver
'92 F250 - junk hauler; previous Porsches '95 993;'08 Cayman S;'70 911E
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