Keeping a House Cool Before Air Conditioning
Direct answer. Before air conditioning, households kept cool by shutting the house against daytime sun and opening it to night air, using shutters, porches, high ceilings, and cross-ventilation. They also reduced indoor heat from cooking when they could. Most of those habits still lower indoor temperatures and reduce the load on mechanical cooling.
How did households stay cool before air conditioning?
Before mechanical air conditioning, households worked with the building and the daily heat cycle. They shut the house against daytime sun and opened it to night cool, used shade and ventilation to move air, and relied on design features built for climate: high ceilings, shutters, porches, thick walls, transoms. The core insight was simple. Keep the sun's heat out by day, and let cool air in when it arrives.
High ceilings let hot air rise. Porches and eaves shaded walls. Shutters stopped heat at the window. Thick masonry slowed daytime heat gain. Cellars stayed cooler and sheltered people and food. Daily habit did as much as design: close in the morning, open after sunset, pull a cross-breeze when possible, and cook early or outdoors when heat was extreme.
What changed
Mechanical air conditioning made indoor comfort less dependent on shutters and night air. Glazing, insulation, and electric fans changed the toolkit. What changed less is solar heat gain through glass and the value of not adding indoor heat at noon. Homes with air conditioning still run cheaper and cooler when daytime sun is blocked and night flushing is used where outdoor air is cooler than indoor air.
Historical Notes
Close blinds, curtains, shutters, or awnings on sunny windows during the hottest hours. When outside air is cooler than inside, open opposite windows to vent heat, then close again in the morning. Use shade from trees or coverings generously. Cook in the cool of the day when you can, and remember that appliances and lights add warmth. Air conditioning works better and costs less when the house is already keeping heat out.
Sources
- General architectural and domestic history of passive cooling in homes before mechanical air conditioning, including shutters, porches, high ceilings, transoms, thick walls, cross-ventilation, and the practice of closing the house by day and opening it by night.