Con Ed rates are about 0.16/kWh so in their case it's not the cost of electricity, it's all the things explained after the $1000/month line, a ridiculous lack of insulation and lack of air-tightness.
They may also keep the heat higher than most people. There's mention of an au pair so there must be a small child.
They may also keep the heat higher than most people. There's mention of an au pair so there must be a small child.