What to do with your AC during a California Flex Alert: Cooling Tips

Key Takeaways

• Flex Alerts reduce grid stress and prevent outages by asking residents to lower electricity use between 16:00 and 21:00, so pre-cool and shift usage to earlier or later to support reliability.
• Pre-cool your home before 4:00 PM, close windows and doors, and use stored solar or battery power when available to keep comfort without adding peak demand.
• During alerts, keep thermostats at about 26 C or higher. Use programmable or smart controls to automate setbacks and resist shutting off the AC completely to avoid hard starts.
• Utilize fans, occupant-centered cooling, and passive cooling to reduce AC runtime while staying comfortable.
• Keep your system maintained. Cleaning or replacing filters regularly, sealing ducts, shading outdoor condenser units, and having professionals check your system before summer helps keep your AC efficient during heat events.
• Engage your family in simple conservation behaviors, measure savings, and reward accomplishments to increase engagement and impact toward lower bills, smarter renewables consumption, and a healthier grid.

What to do with your ac during a california flex alert Instead, shift cooling to early morning and late evening when temperatures drop and run fans to circulate air while maintaining the thermostat 2 to 3 degrees Celsius higher than usual. Keep blinds closed, seal gaps and take advantage of shaded outdoor air flow, if safe. For longer alerts, consider portable coolers or community cooling centers. The following section provides timing and settings by step.

Alert Basics

A Flex Alert requests consumers in California to voluntarily reduce electricity consumption during periods of supply tightness. These alerts aim to decrease demand so the electric grid can continue operating outage-free. Below are key facts, actionable steps, and their importance to your A/C and daily life.

1. What a Flex Alert is and when it’s issued

A Flex Alert serves as a voluntary call to conserve power when the grid is facing a shortfall. Grid operators, typically the California Independent System Operator (CAISO), provide alerts frequently a day in advance, allowing homes to prepare accordingly. These alerts are most common during peak summer months when extreme heat leads to heavy air conditioner usage.

2. Typical timing and why evenings are critical

Flex Alerts are usually in effect from 4 PM to 9 PM. As the sun goes down, solar output decreases while demand remains high as people return home and activate their AC, lights, and major appliances. This mismatch creates stress on the grid and increases the chances of voltage drops, brownouts, or rotating outages.

3. The purpose: prevent outages and protect reliability

Minimizing demand during a Flex Alert helps avoid more severe measures such as rolling blackouts. Small changes across many homes can significantly reduce the burden on transformers and transmission lines. This maintenance of frequency and voltage in safe ranges aids the system in managing heat waves effectively.

4. Practical thermostat guidance for air conditioning

If health permits, adjust thermostats to 78 degrees Fahrenheit or higher during alerts. Raising that setpoint by a few degrees can save a considerable amount of energy. Having a programmable or smart thermostat is highly recommended if you want to automatically increase the temperature during alert hours and then cool down afterward. Pairing these setpoint shifts with fans can keep occupants comfortable while consuming less energy.

5. Shifting, delaying, and avoiding appliance use

Shift intensive activities to morning or early afternoon when solar production is higher and demand lower. Steer clear of dishwashers, clothes washers and dryers, and ovens during alert hours. Run laundry earlier in the day, cook with a microwave or stovetop before 4:00 PM, and delay dishwasher cycles until after 9:00 PM.

6. Small actions that add up at scale

Close blinds or curtains on sun-facing windows to reduce heat gain. Utilize ceiling or portable fans to circulate air and allow for higher thermostat settings. Shut off unnecessary lights and appliances, and unplug those that draw standby power. Even short, synchronized cuts in electricity usage across thousands of homes lessen grid strain and decrease the likelihood of rolling outages.

Manage Your AC

Flex Alerts in California indicate elevated grid strain due to extreme heat, prompting a request to reduce electric consumption. Instead, aim for smart, focused AC that reduces load while maintaining indoor comfort. The tips below address timing, thermostat settings, airflow, heat control, and automation, along with quick tips to employ during an event.

• 01 Manage Your AC — Run the AC earlier in the day to pre-cool and then raise set points during peak.
• Manage Your AC – During alerts, set your thermostat at around 26°C (78°F) or higher to conserve energy.
• Ceiling and portable fans increase your comfort level. Use them only in rooms you occupy.
• Close blinds and shades on sun-facing windows to reduce heat gain.
• Avoid major appliances (ovens, dryers, dishwashers) between 16:00–21:00.
• Kill unneeded lights, TVs, and idle laptops to lower load.
• Use battery storage or solar to run AC during pre-cool or shift cooling to midday solar production.
• Think about community cooling centers or shaded outdoor spaces if home cooling has to be reduced.

1. Pre-Cool Early

To effectively manage the electric grid during extreme heat, pre-cool your home by running the AC in the morning and early afternoon before 4:00 PM. This strategy allows your building to absorb cool air while minimizing energy use during peak hours. After pre-cooling, close all windows and doors to trap the cool air effectively. If you have solar power or battery storage, utilize them to power the AC during pre-cooling, especially when solar output is highest, thus reducing strain on California’s power grid.

2. Set Points

Adjust thermostats to 78 degrees during Flex Alerts for a comfort and electric grid sweet spot. Each degree above 72 degrees can reduce cooling energy by approximately 3%, decreasing aggregate demand. Utilizing programmable or smart thermostats can help automate higher set points during 4 PM to 9 PM and restore them at night. It’s important not to turn your AC all the way off, as compressors pull heavy current on restart, stressing both your unit and the power grid.

3. Circulate Air

Boost comfort and enable higher thermostat settings with ceiling fans and oscillating fans. To conserve energy during a flex alert, run fans solely in occupied rooms and turn them off when unoccupied. Additionally, turn your ceiling fan to reverse to push cool air down when it is hot outside, especially during extreme heat. Once the flex alert has completed and outdoor air has cooled, open windows and run fans to bring in fresh, cooler air.

4. Block Heat

To stay cool during extreme heat, shut blinds, curtains, or reflective shades on windows exposed to the sun to reduce heat. Additionally, using window film or temporary reflective covers for major glass surfaces can help. Seal gaps around windows and doors to keep hot air from leaking in. It’s wise to avoid using heat-making appliances like ovens, microwaves, and air fryers during peak hours to prevent indoor temperatures from rising.

5. Automate Settings

Go beyond managing your AC with smart thermostats, timers, and energy management apps to reduce AC and appliance load during California’s Flex Alerts. Program reductions between 4:00 PM and 9:00 PM, including smart water heaters and pool pumps in schedules. Utilize smart meters or apps to track consumption and adjust settings over time for optimal output, especially during extreme heat.

Passive Cooling

Passive cooling is how to cool buildings without mechanical systems such as air conditioners. This approach not only reduces indoor temperature but also aids in energy conservation during a flex alert, which is crucial for managing the electric grid in California. They are most effective in mild climates and with temperate air conditioning, like setting the thermostat at 26C/78F or above.

Open windows for cross-ventilation when mornings or evenings are cooler to let cool air in and push warm air out. Set the windows open on different sides of the house to generate a breeze. If you can, open lower windows on the shaded side and higher windows on the sunny side to catch a stack effect that whisks warm air up and out. Shut windows and door gaps before the day warms up to keep the cooler air inside. Install window screens or insect netting and you can leave windows open safely overnight.

Shade windows when it’s hot to minimize direct sunlight. Draw blinds or lower curtains on sun-facing windows and employ light-reflective materials on window treatments when possible. Exterior shades, like roller blinds, shutters, or reflective film, stop solar radiation before it penetrates glass and work better than interior drapes alone, especially during extreme heat events that can lead to rolling blackouts.

Implement reflective or light-colored roofing and exterior paint to redirect solar heat and reduce roof surface temperature. Lighter surfaces reflect sunlight and reduce the heat that penetrates the building envelope. If repainting, use paints designated for solar reflectance or apply cool-roof coatings on roofs that can decrease heat by a few degrees Celsius. Anything, even emergency reflective sheets against a roasting roof vent for a few hours of noontime sun, can make a significant difference, particularly in California’s challenging climate.

Plant shade trees or awnings to shade sunny sides of the house. Strategically placed trees with broad canopies can shade the walls and windows during the summer months and permit the winter sun when their leaves have dropped. Awnings and pergolas offer instant shade and can even be retractable to give you control through different seasons. For renters, portable shade sails or giant potted plants placed outside of windows provide similar benefits without the commitment.

Employ easy personal cooling techniques to feel cooler without AC. Put wet towels on your neck and wrists or take cool showers in the morning or evening. The Law of Evaporative Cooling states that if you wear light, airy clothes and use a fan to promote evaporation from your skin, it makes room temperatures feel significantly cooler by several degrees. Schedule heavy appliance use—ovens, dryers, dishwashers, etc.—outside late afternoon and early evening to avoid adding internal heat when it’s hottest, particularly during California’s heat waves.

Passive cooling lowers your energy consumption and makes your home a cozy oasis, particularly when combined with conscientious AC thermostat settings and behavioral adjustments. This strategy not only helps you stay cool during a flex alert but also contributes to the overall stability of the California power grid.

System Maintenance

System maintenance is crucial for keeping an air conditioning system reliable and efficient, especially when the electric grid is taxed during a Flex Alert. Routine maintenance not only reduces the risk of unexpected collapse but also assists the system in operating near its intended efficiency, potentially lowering energy consumption and expenses. To prepare for extreme heat, do basic checks and maintain a calendar for seasonal servicing so the unit is ready before the temperatures soar.

Wash or replace filters every month in warm seasons. A clogged filter constrains air flow, makes the compressor work harder and increases energy consumption. For houses with pets or heavy dust, use pleated MERV 8 to 11 filters and exchange them every 30 days if heavy, otherwise every 90 days. Demonstrate how a new filter can reduce pressure on the fan and save kilowatt-hours versus a dirty one.

Check ductwork for leaks and gaps. Leaky ducts can blow cooled air into unconditioned areas and increase runtime. Seal exposed holes with foil-backed mastic or UL-classified metal tape, not cloth-backed duct tape, which degrades and comes off eventually. Inspect joints at boots, plenums, and to furnace or air handler. A smoke pencil or incense can reveal small leaks during run. Even a couple percent of air loss can unnecessarily boost energy demand during a Flex Alert when every kilowatt matters.

Schedule a professional inspection before summer hits. A trained technician can test the refrigerant charge, check the compressor and motor, and if the compressor struggles to restart, they may recommend a hard start kit. These kits lower startup current and ease stress on aging compressors, making them a valuable alternative when utilities request customers to cut back on energy usage. Ensure the technician lubricates moving parts, tightens electrical connections, and scans for worn components that could fail during extreme heat.

For system maintenance, ensure the outdoor unit remains clear and shaded. Remove leaves, grass clippings, and other debris from within approximately 0.5 to 1 meter of the condenser to facilitate good airflow. Trim back vegetation to provide at least 30 cm of clearance on the sides and 60 cm above. If possible, installing a sun shade that doesn’t obstruct airflow can help reduce the condenser’s operating temperature. A shaded unit can run more efficiently and draw less power during peak periods.

Perform time maintenance at off-peak time when possible so as not to add to the load in peak working times. Preventive maintenance can prolong system life and minimize repair costs. This holds true across HVAC, electrical, and plumbing domains.

Conservation Psychology

Conservation psychology researches how humans think and behave in relation to the natural world and our energy consumption. It examines the psychology, the social forces, and the education that influence whether we take action like turning down the AC during a Flex Alert. Grasping these concepts assists families in creating easy, efficient solutions that secure buy-in from all.

Conservation has a social side: voluntary actions add up. Once enough homes go off AC for a couple hours, grid stress drops and outages are less likely. That cumulative impact relies on defined standards and common objectives. There is something about the conceptualization of a Flex Alert as a community effort—neighbors, friends, family, all of us doing small things—that makes it easier to do. Good feedback and tangible results, in turn, strengthen the habit so they continue.

Kids react to the way adults engage them. Conservation psychology draws on child development research such as Piaget’s stages. Children often develop conservation skills between about 7 and 11 years old, with mass concepts around 8 to 10 and volume near 11 to 12. Children younger than that can concentrate on one salient characteristic, a behavior known as centration, so they require practical, hands-on activities instead of abstract discourse. Studies demonstrate that kids who participate in conservation acts score higher on conservation tasks than kids who observe. Include them by inviting them to help shut vents, set the thermostat, or check window seals. Customize activities to age and culture. Kids from other cultures may be more or less knowledgeable, and your approach in questioning or instructing can frame responses.

Practical steps work best when you co-create the plan. Have them enumerate energy-saving behaviors during an alert and assign roles. Utilize obvious, small tasks of aligned ability and habit. For example, turn your thermostat up 2 to 3 degrees Celsius, use fans rather than air conditioning for brief amounts of time, and close your curtains to block the afternoon sun. Hands-on alternatives assist younger children in absorbing conservation concepts such as volume or mass through household activities. Pouring water demonstrates how a closed lid minimizes cooling requirements, for example.

Ways family members can participate:

• Increase the thermostat by 2 to 3 degrees Celsius during alerts.
• Use ceiling or portable fans for rooms in use
• Close blinds and curtains before peak heat
• Cook with your microwave or outdoor grill to eliminate heating your house.
• Take cooler showers in the morning instead of running the AC longer.
• Close doors to unused rooms and seal drafts
• Log energy use and note changes after the alert

Celebrate success to stress habits from Conservation Psychology learning to habit. Share reduction numbers with neighbors, post a quick family chart, or reward kids for tasks completed.

Participation Benefits

There is a tangible, demonstrable upside for both the individual and the overall system to participating in a Flex Alert in California. At the household level, conserving electricity during peak hours results immediately in less expensive energy bills and can help to avoid peak pricing surcharges as well. Participants may earn money for saved energy; programs commonly credit roughly $2 per kilowatt-hour (kWh) reduced. For an average residential customer, small shifts across a few peak events can amount to $40 in bill credits. Compensation typically pays as a bill credit, frequently at the beginning of the following year, so monitor your deductions to confirm payments.

Participant Benefit	Energy Conservation Impact
Direct bill credits (e.g., ~$2 per kWh)	Encourages lower use during peaks, reducing demand
Lower monthly energy bills	Fewer kWh consumed overall from behavior changes
Avoided peak surcharges	Less financial risk from time-of-use or demand charges
Support for renewable integration	Shifts demand to periods with abundant solar/wind
Grid stability and outage risk reduction	Reduces strain on generation and transmission at peaks
Personal satisfaction and climate action	Lowers household carbon footprint through real actions

By shifting load away from peak hours, you help utilities efficiently align supply and demand on the electric grid. When lots of participants postpone appliance use or increase cooling setpoints during extreme heat, the California Independent System Operator (CAISO) requires less fast-ramping fossil generation. That simplifies the utilization of excess solar power in the afternoon and wind in the 0 to 3 a.m. window. For example, running a dishwasher at 9:00 p.m. instead of 6:30 p.m. or pre-cooling a home before peak hours can move several kilowatt-hours out of strained windows, sometimes earning the participant the $2 per kilowatt-hour credit while freeing capacity for others.

Hands-on habit changes deliver dollars and systems results. Shut down nonessential lighting, unplug unused chargers, defer clothes dryers and EV charging, and increase thermostat setpoints a few degrees during alerts. Set phone reminders or smart-home schedules to automate these steps. Planning ahead matters. Participants who prepare lists and timers are more likely to act when an alert arrives and to claim credits later.

Aside from the cash, there’s a civic aspect. Participating not only supports a healthier grid but saves you money, too. Most of us feel good about contributing to grid stabilization and carbon reduction. Participation is pragmatic, quantifiable and reproducible. Incremental, purposeful shifts accumulate to significant systems-level gains.

Conclusion

Stay smart and transparent with the AC. Turn down your thermostat a few degrees. Increase fan speed for constant flow. Schedule your AC to run during cooler hours. Shut blinds and seal drafts to reduce heat gain. Turn the fan to auto when the house cools quickly. Use a box fan by the window at night to bring in fresh air. Clean filters and check vents so the unit runs with less strain. Turn on ceiling fans to distribute cool air and reduce the load. The payoff from these actions shows up as decreased payments and fewer breakdowns throughout the block. Ready to test a change today? Choose a tip above and try it out during the next flex alert.

Frequently Asked Questions

Should I turn off my AC completely during a California flex alert?

To help manage the electric grid during extreme heat, crank up the thermostat a few degrees (2 to 4 degrees Celsius / 4 to 7 degrees Fahrenheit), easing grid stress while staying cool.

Can I run my AC on a timer or schedule during a flex alert?

Yes. If you have a programmable or smart thermostat, schedule your AC to operate during these cooler early morning or evening hours to help manage the electric grid during California’s heat wave, reducing peak demand and saving energy without compromising comfort.

Is it safe to use fans instead of my AC during a flex alert?

Yes. Fans consume much less energy and enhance comfort through increased air flow, especially during California’s extreme heat. Pair fans with a raised thermostat to save energy.

Will raising my thermostat harm my HVAC system?

No. It’s safe to crank up the air conditioning to 78 degrees briefly during a flex alert. Steer clear of frequent drastic thermostat swings to minimize wear on the electric grid.

How else can I keep my home cool without AC during a flex alert?

To stay cool during California’s extreme heat, close blinds, caulk gaps, use reflective window film, and utilize night ventilation to minimize indoor heat gain.

Does participating in flex alerts actually help the grid?

Yes. Widespread small changes in peak hour usage, especially during California’s extreme heat, reduce the need for emergency measures. Every little bit helps, enhancing reliability and avoiding rolling blackouts.

Are there financial benefits to reducing AC use during flex alerts?

Yes. There’s a bonus too — lower energy use during California’s flex alert means lower bills. Some utilities even offer rebates for participants or smart thermostats, boosting the savings.