What is best temperature to set thermostat in winter to save money?

What is the best temperature to set thermostat in winter to save money and what does auxiliary heat mean? Here's what temp ...
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7 ways you've been using your thermostat wrong (and it's been costing you money) — this is what heating experts say to do instead

When the temperature drops at this time of year, we all use our heating more in order to stay warm. An unhappy side effect of that is that our energy bills are the highest at this time of year too.