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Two occupants.
1400sq two story w/basement.
-Insulated steel doors.
-Double pane windows.
-Steel siding/foam insulation over original siding.
-3 inches of foam around cinderblock foundation down to frost line.
-Basement vent windows are cinderblock w/small screen openings(insufficient cross ventilation in summer, getting a fan).
-All basement hot water pipes wrapped in foam w/metaltape corners.
-1.5W LEDs and 13WCFLs usually left on for zone lighting.
Two computers, two medium tube tv's. Somethings always on.
Heat stays at 64-68deg. Our highest combined gas/electric was last winter for $220. Usually around $170-200.
$600/month is worth spending money to permanently fix. Use a infrared thermometer on the walls to find heat loss, and consider getting a Killawatt monitoring gizmo.
There may also be something wrong with the meter if the bills are out of historic norm, worth checking into.
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