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Every time a major heatwave hits, the immediate reflex is to sprint to the thermostat and crank the air conditioning. But running your AC on blast is a losing battle if your house is actively fighting against you.Recently, I audited my own home to track down the overlooked appliances and habits that were actively generating heat, and the impact on my comfort and energy bill was immediate.It turns out that several everyday habits and overlooked household fixtures are quietly turning our living spaces into saunas. These practical, low-cost strategic adjustments to your sunlight, appliances, and electronics will slash your cooling costs tonight.
1. Sunlight vs glass
Letting natural daylight stream into your home during a heatwave seems innocent, but standard window glass acts like a solar trap. Between 10 a.m. and 4 p.m., your home experiences heavy solar heat gain as short-wave sunlight passes easily through the glass, warms up your floors and furniture, and converts into long-wave thermal radiation that cannot escape. To stop your home from turning into a greenhouse, enforce a strict curtain lockdown and close all blinds completely during peak afternoon hours to block this thermal energy before it enters the room. Once the outdoor temperature drops below your indoor baseline at night, open your windows wide to flush the house with crisp evening air, making sure to shut them tight first thing in the morning to lock in the cool atmosphere.
