Use the thermostat properly
Summers are hotter today than they were in the past. Global warming is a reality. Sea levels are rising all over the world as news of glaciers and sea ice melting spreads. More individuals nowadays keep their air-conditioning on for longer, which contributes to higher temperatures and humidity.
Of course, the more you utilize your air-conditioning systems, the more costly they will be. This guy must have had it with outrageous energy expenses, so he took it upon himself to show his girlfriend how to operate it.