During a severe summer heatwave, you should strictly keep all your home's windows tightly closed and covered with blinds or blackout curtains during daylight hours to prevent outdoor thermal heat and intense solar radiation from flooding your living space. Opening windows when outdoor temperatures exceed indoor temperatures will immediately heat up your house, forcing your air conditioning system to work continuously at maximum capacity and driving up your utility bills. The only time it is advisable to open windows during a heatwave is late at night or early in the morning if outdoor air cools down significantly below indoor levels, and even then, closing them up by mid-morning is essential. You can troubleshoot indoor temperatures using a room thermometer. You can verify success when keeping windows shut during peak heat keeps your home cool.
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