Electric heating and cooling (instead of gas, which while still energy doesn’t go in the same bucket) and probably a larger house.

His usage is high by the standards of the region, so it probably is also something like an electric car or crypto mining.

(For what it’s worth, a swamp is far harder to cool than a desert - five of the top six states in the US by energy usage are on the Gulf coast. The average Floridian household uses ~13700 kWh/year whereas New Mexico is ~8000 kWh/year. On the other hand, the household average in Canada is higher than in the US, so…)