Key takeaways
- The Delta breeze brings cooler evening air from the coast.
- Open up at night to flush heat, then close up by morning.
- Whole-house and window fans amplify the effect.
- It gives your AC a real break and cuts bills.
One of Sacramento's best natural features is the Delta breeze, the cool evening air that rolls in from the San Francisco Bay and Delta. Used well, it is free cooling that can give your AC, and your bill, a real break.
Quick answer
When the Delta breeze arrives in the evening, open windows on opposite sides of the home to flush out the day's heat, and run fans to pull the cool air through. Close everything up in the morning to trap the cool air before the day heats up. It can significantly reduce AC run time.
What the Delta breeze is
On many summer evenings, cooler marine air flows in from the west, dropping temperatures considerably after sunset. It is a reliable enough pattern that locals plan around it, and you can put it to work cooling your home.
How to use it
- When the outside air cools below your indoor temperature, open windows on opposite sides.
- Run a whole-house fan or window fans to pull the breeze through.
- Focus on cross-ventilation, an inlet low and an outlet high works well.
Close up before the heat
The trick is timing. Close windows and blinds in the early morning to lock in the cool air before the day heats up. This delays when you need the AC and keeps the house comfortable longer.
Combine with smart settings
Pair the breeze with smart thermostat setbacks and good shading for the biggest effect, see our thermostat guide and cooling bill tips.
Want efficient summer comfort?
Ask us about whole-house fans and smart controls that work with our climate.
