Comment by dsr_

The figure you are looking for is heating/cooling degree-days.

For each day, use the average high and the average low. Subtract the desired maximum dwelling temperature from the average high: if the result is positive, add it to the cooling degree-days total. Subtract the average low from the from the minimum dwelling temperature: if the result is positive, add it to the heating degree-days total.

Over a year, that gives you comparable figures on how much you will need to cool or heat the space. Many agencies calculate this for specific areas.

Here, for example, are the current season numbers for Boston: https://www.massenergymarketers.org/resources/degree-days/bo...

Generic regional numbers for the US: https://www.eia.gov/energyexplained/units-and-calculators/de...