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Terms:

Baseload energy use aka baseline usage - is the energy used in a home for everything but heating and cooling and includes the lighting, washer and dryer, refrigerator, cooking, hot water and plug loads. It's usage is pretty consistent from month to month, which is why it is called the baseload. Energy efficiency upgrades that will only effect the baseload energy use of a home are: water heater blankets, CFL bulbs, dryer vent cleaning, and using a smart strip to turn off unused plug loads.
Seasonal energy use - is the energy usage during the heating and cooling months and only accounts for the heating and cooling energy consumption. The seasonal usage varies from month to month depending on the weather and the billing period. Energy efficiency upgrades that will only effect the seasonal energy use of a home are: insulation, air and duct sealing, radiant barrier, transfer grilles and shade screens.

Gather 12 months (at least, 24 months is better for more accurate data) of utility bill data for both gas and electric utility bills.
List out each month of the year and the corresponding energy usage in kWh for electricity or therms/ccf for natural gas.
For the cooling months, let's look at just the electricity use in kWh.
Take the lowest 4 numbers and average them together (by adding them up, then dividing by 4). This is your baseline or baseload energy use, the amount of electricity the homeowner consistently uses.
Now let's find the seasonal energy usage by subtracting the baseload number you previously found from all the months.
If you graph the seasonal energy usage you will see a peak during the hottest summer months where the air conditioner was used the months and a gradual decrease in consumption.
If you add all the seasonal energy usage numbers together, you have your total seasonal energy use for cooling.
Do the same steps for the heating months by taking the natural gas consumption and plotting the energy usage.
If you have a heat pump that satisfies both the homes' heating and cooling needs take the 3 lowest months and average them together (by adding them up, then dividing by 3) to find your baseline. The seasonal energy usage will be the summer months for cooling and the winter months for heating.