My husband and I always argue about the temperature in our house

My husband and I always argue about the temperature in our house. I like it at 76.0°F, while he likes to set the thermostat to 73.0°F. As we take turns constantly changing the setting, our poor heating and cooling system tries to keep up. I argue that it causes us to waste money. My living room contains 57 kg of air. In the summer time, I pay about $0.15 per kWh of energy used. How much does it cost me every time we heat the air in the living room from 73.0°F to 76.0°F? (HINT: How many kWh does it take?) The heat capacity of our air is 1.01 J/(g°C).
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