Your heating costs are extremely cheap. Here in Texas, during the winter, I spend $300-$400 a month for natural gas to heat my home at
70 deg. F. Granted I have an old home but this is similar to what others pay in the area. In the summer, the electric bill can get up to
$600 for air conditioning.(78 deg. F. on the thermostat).
We pay 16.9 cents per kilowatt.

Here in Texas, during the winter, I spend $300-$400 a month for natural gas to heat my home at 70 deg.

70 huh? 45 degrees. All winter long.

(Why? Don't like sending money to the energy company)

Go read some historic documents about room temp. 70 would have been considered warm.