Key Takeaways
- Understanding Time of Use (TOU) rates and scheduling HVAC systems around peak and off-peak hours can lead to significant energy and cost savings for households.
- By moving HVAC usage to off-peak hours and leveraging pre-cooling, peak hour coasting and off-peak recovery, you can stay comfortable and reduce your electricity bill.
- By choosing the right rate plan and periodically evaluating available options, customers are empowered to maximize savings based on their individual energy requirements.
- Pairing smart thermostats and other efficiency boosters, like home sealing and window treatments, takes your household to the next level.
- Steering clear of typical culprits such as overcooling, manual overrides and disregarding weather patterns promotes steady savings and an efficiently operating HVAC system.
- If you regularly review your electric bills and think in terms of investments, a little energy management can go a long way.
PG&E time-of-use (TOU) rates charge more for electricity during peak hours – typically 4:00 PM to 9:00 PM on weekdays – and less at all other times. Because your air conditioner is one of the largest electrical loads in a Sacramento Valley home, the single most effective way to lower your summer bill is to shift cooling to off-peak hours through pre-cooling, peak-hour coasting, and off-peak recovery.
This matters most here in Winters and across Yolo and Solano counties, where 100°F-plus afternoons keep air conditioners running for months at a time. Getting your HVAC schedule right, then pairing it with the correct PG&E rate plan, a smart thermostat, and a well-sealed home, can meaningfully cut what you pay each month. Below, Pearce Heating & Air Conditioning explains how TOU pricing works and how to build a scheduling strategy around it.
How PG&E Time-of-Use Rates Work
TOU rates, or Time-of-Use rates, are a way to price electricity where the rate varies by time. These rates are important to HVAC systems because operating them during high-cost hours can increase bills quickly. By scheduling HVAC consumption around these prices, you can save money and consume energy more responsibly.
TOU rates incentivize users to shift when they consume power, which reduces stress on the grid and fosters a resilient, sustainable energy future. Being aware of your TOU and tracking your energy habits can help you identify ways to shift more of your HVAC operation to the less expensive time periods.
What Peak Hours Cost
Peak hours are when electricity demand is at its highest, usually late in the afternoon and evening on weekdays. During these hours, rates soar, and operating HVAC equipment can be significantly pricier. This price jump can result in massive bills if significant HVAC use coincides with peak usage periods.
Some households drive their bills significantly higher if they don’t watch the clock.
- Program thermostats to a higher temperature in the summer or a lower temperature in the winter during peak periods.
- Use programmable thermostats to reduce HVAC usage during peak hours.
- Close blinds or curtains to keep rooms cool without additional air conditioning.
- Run ceiling fans to help distribute air and reduce cooling demand.
- Delay laundry or dishwashing to off-peak hours.
For instance, programming your AC to pre-cool a home right before peak hours end can keep temps comfortable while saving you from high rates. Shifting as much cooling or heating as possible to off-peak times each day keeps bills down and eases peak demand stress on the grid.
What Off-Peak Hours Cost
When you run your HVAC in off-peak hours, you run it when demand and rates are lower, usually 10 to 30 percent less than peak. That can translate into direct savings every month. Pre-cooling or heating outside peak times is one of the easiest ways to save money.
That’s because off-peak savings really do add up. Even things as simple as pre-cooling your home in the morning or setting the heat to come on earlier can translate to significant reductions in monthly bills. Over a year, this can unlock money for other uses.
Cool or heat your home when rates are lowest to maximize comfort. Rooms can be pre-cooled or heated before TOU peaks, when it is more expensive to operate the system.
Which Rate Plan You Are On
| Rate Period | Typical Hours | What It Means for Your HVAC |
|---|---|---|
| Peak (most expensive) | 4:00 PM – 9:00 PM | Highest rates. Minimize AC, heating, and large appliances during this window. |
| Off-Peak (lowest on most plans) | 9:00 PM – 4:00 PM | Lower rates. A good time to pre-cool, recover temperatures, and run appliances. |
| Super Off-Peak (select plans only) | Overnight and early morning | Lowest rates where offered. Ideal for EV charging and pre-conditioning your home. |
Getting your plan choice right can really make a difference. All plans have different peaks and off-peaks, and some provide even lower rates late at night or early morning.
If you wanted to understand TOU, think about how much is used, when it is used, and if routines are flexible. High daytime use households, for example, may save more with plans that have longer off-peak windows. Plans shift as seasons do, so it’s smart to shop around and review your options annually for the best match.
How to Schedule Your AC Around TOU Rates
Strategic HVAC scheduling refers to timing your heating or cooling to coincide with TOU rates. By shifting HVAC use away from peak hours, usually 4:00 PM to 9:00 PM, homeowners can avoid higher rates and bring down energy bills. It also lowers overall energy demand, which eases strain on the grid and reduces emissions.
With smart schedules, homeowners can keep their homes comfortable and still save. Your optimal strategy will vary depending on your home’s specific needs, energy habits, and local climate. Most are surprised to discover even minor adjustments, like leveraging fans or adjusting window blinds, can result in genuine savings.
1. Pre-Cooling Strategy
Pre-cooling takes advantage of HVAC systems prior to peak hours to cool the house when electricity is less expensive. By running the air conditioning in the morning or before 4:00 PM, the house cools down while rates are lower. Then your system can work less hard during expensive peak periods.
This approach is especially effective in the Sacramento Valley, where hot afternoons follow cooler mornings and Delta-breeze evenings. To pre-cool most effectively, turn the thermostat a few degrees cooler than normal during the off-peak hours. Tracking indoor temperatures prevents overcooling, which might waste energy.
Pre-cooling works better with doors and windows closed once the peak period starts. Homeowners who monitor their indoor conditions can modify this tactic to suit their routine and preferences.
2. Peak Hour Coasting
Peak hour coasting allows the interior temperature to drift back somewhat during peak pricing, so the HVAC runs less. This is important because energy costs are highest from 4:00 PM to 9:00 PM. Rather than using air conditioning, homeowners can take advantage of the breeze by opening windows in the early evening or overnight.
Cross-ventilation cools the space and minimizes the use of mechanical cooling. Knowing when your local utility’s peak hours are is crucial. If you can, don’t use energy-heavy appliances during these times, just as some wash laundry at night.
Coasting through peak hours doesn’t just save money; it alleviates strain on the grid.
3. Off-Peak Recovery
This is where off-peak recovery comes in, and that’s when the HVAC system “catches up” after peak hours. Powering the system back up during low-rate periods, such as late at night or early in the morning, lets your home naturally return to a comfortable temperature without the expensive rate.
This strategy leverages cheaper electricity, as it’s more cost effective. Letting it bounce back during non-occupied periods helps keep indoor temperatures steady. Used consistently, regular off-peak recovery will lower your energy bills and keep you comfortable.
This method is adaptable and applies to cooling as well as heating.
4. Seasonal Shifts
They seasonally impact when homes need heating or cooling. For your summer bills, it’s savvy to begin cooling earlier and rely on fans to distribute the cool air. In the winter, pre-running the heater and plugging drafts can do the trick.
Adjust your schedule to take advantage of cooler mornings and milder evenings. Preparing systems for the season, such as cleaning filters and checking insulation, helps efficiency. Others discover that heavy winter curtains or reflective summer blinds keep their energy bill in check.
5. Smart Thermostat Integration
Smart thermostats simplify the scheduling process and help you schedule more precisely. These devices can adapt HVAC settings to TOU rates automatically. Several models allow users to program intricate schedules or use self-learning features to adapt to daily routines.
Programmable options provide precise control while remote access keeps homeowners in charge of settings from anywhere. Usage tracking identifies trends and opportunities for savings. Smart thermostats enable energy efficiency and sustainability.
Other Ways to Cut the Peak Bill
When it comes to optimizing your HVAC schedules on PG&E’s time-of-use plans, it extends far beyond just adjusting thermostat settings. Thermostats are important, but the real savings come from a combination of actionable measures. Together, these steps help Sacramento Valley homeowners cut energy use, stay comfortable, and lower their bills through our long, hot summers and mild winters.
- Seal gaps, cracks, and leaks to maintain interior air stability.
- Insulation in attics, walls, and floors can help slow heat flow.
- Install window treatments to reduce heat gain and loss.
- Clean or replace your air filters every month for improved airflow.
- Run appliances such as washers and dishwashers during off-peak hours.
- Join energy-saving programs for incentives and bill credits.
- Follow maintenance schedules for HVAC units to improve efficiency.
Home Sealing
Home sealing closes the air leaks that otherwise escape and waste energy, driving up costs. Holes around doors, windows, or pipes exhaust cooled or heated air. This causes the HVAC system to struggle, leading to increased energy use and bills. Caulking or weatherstripping these gaps keeps inside air where it belongs.
Effective insulation, along with sealing, stabilizes indoor temperatures. Insulating your attics, walls, and floors prevents heat from escaping in winter or entering in summer. This increases comfort and reduces HVAC run times.
It’s worth it to invest in sealing and insulation. Households experience monthly bills and fewer drafts. As many customers discover, sealing their homes ensures better indoor comfort and long-term savings. Proper sealing promotes more consistent indoor humidity and air quality.
Window Treatments
Windows can be a weak point. Window treatments reduce this. Shades, blinds, and films reduce incoming heat during summer. This keeps rooms cooler, so the AC runs less.
Thermal curtains for winter provide a shield from the cold wind and trap warmth inside. This means heaters don’t have to run as much, saving energy.
Choose window treatments based on your climate and the direction each window faces. In the Sacramento Valley’s hot summers, reflective films and light-colored shades are especially effective at blocking heat gain. In the milder winter months, heavier drapes help hold warmth inside. Even minor adjustments, such as drawing drapes at night, can help.
Appliance Timing
Appliances at the right time lead to big savings, particularly with TOU plans. It’s not just about the thermostat. Major appliances that run during off-peak hours benefit from lower rates. This lowers expenses and assists in leveling energy load.
Laundry machines, dishwashers, and even electric ovens are big energy suckers. Moving their consumption to off-peak hours saves money and reduces strain on the grid. For households that shift their routines, bills come down and costs become more predictable.
Knowing when and how you’re using energy is critical. Tracking your usage patterns and scheduling activities for off-peak times is important. Flexibility, such as shifting chores or reacting to utility notifications, can boost savings.
- Wash clothes after 9:00 PM or before 2:00 PM when rates drop.
- Run dishwashers late at night, avoiding peak evening hours.
- Charge electric cars overnight or early morning.
- Postpone vacuuming or ironing to weekends or off-peak windows.
Mistakes That Cancel Out the Savings
Many PG&E time-of-use customers end up with higher bills because of simple HVAC scheduling mistakes. These mistakes typically stem from a lack of understanding of how TOU rates work or bad habits that don’t align with the cheapest way to use energy. Other mistakes can feel small but end up costing a lot.
Some common pitfalls include:
- Running HVAC systems during peak hours, usually between 4:00 PM and 9:00 PM, which have the highest rates.
- Disregarding off-peak and super off-peak hours where energy is reduced by 10 to 30 percent.
- Overcooling or overheating the home for long periods.
- Manually overriding programmed schedules too often.
- Ignoring seasonal and weather-driven changes to your schedule.
- Overlooking the benefits of smart thermostats and automation.
- Failing to schedule other high-energy appliances, such as washers or dryers, during off-peak times.
- Allowing usage to creep above base allowances incurs extra fees.
- Not verifying whether the peak hours move with other TOU rate plans.
Overcooling
Overcooling is a typical problem, particularly in heat waves. Making the thermostat too low forces your HVAC system to run longer, which increases its electricity consumption and your bill. It is tempting to set the thermostat below 72°F hoping the house will cool faster, but it will not, and it wastes energy.
Overcooling can leave rooms chilly for some, causing them to reach for additional blankets or layers, negating the cooling effect. As a rough rule of thumb, keep the thermostat around 75°F during the day and turn it up a degree or two at night.
These are smart, simple measures that save energy without overheating the house. Striking a balance between comfort and savings keeps everyone in the home happy while maintaining reasonable energy bills.
Manual Overrides
Frequent manual changes to the thermostat tend to ruin the schedule. This habit can disrupt energy-saving schedules, particularly if it occurs during prime-time hours. It is tempting to adjust the temperature on the fly, but every override fuels increased usage and expenses.
Adhering to programmed settings is optimal for consistent savings. If comfort is an issue, small tweaks to the schedule work better than frequent manual changes. Smart thermostats can help here, enabling temporary changes that automatically fall back to the original schedule, striking a balance between comfort and savings.
Ignoring Weather
Weather is a huge factor in HVAC strain. Not checking the forecast can make the schedule less effective. On cooler days, running the AC like it’s hot out there is just wasting energy. During heatwaves, if you don’t pre-cool before peak hours, you suffer and pay when the system has to work overtime.
Tailoring the schedule to daily and seasonal weather variations keeps energy use low. Smart thermostats that monitor local weather automatically adjust, or users can make manual adjustments based on the forecast. This forward-thinking philosophy prevents any shocks on the energy bill and maintains spaces cozier.
How Much You Actually Save
Knowing the financial impact of a TOU HVAC schedule is crucial to anyone seeking to reduce energy expenses. Smart scheduling can help homeowners and businesses reduce their bills by scheduling energy use for when rates are lowest. With TOU plans, the price per kWh fluctuates depending on the time and season.
Peak hours, usually from 4:00 PM to 9:00 PM, are more expensive, while off-peak hours are meaningfully cheaper. Operating your heating, cooling, and household appliances at the right time really can make a difference. Here is how to think about the savings.
The exact savings from off-peak scheduling depend on three things: your plan’s peak rate, its off-peak rate, and how much of your HVAC and appliance use you can move out of the 4:00 PM to 9:00 PM window. On most PG&E residential time-of-use plans, off-peak electricity costs noticeably less per kilowatt-hour than peak power, so the more cooling and large-appliance use you shift to off-peak hours, the more you save. For an accurate estimate, check the per-kilowatt-hour rates on your latest PG&E statement, then apply the lower off-peak rate to the usage you can realistically move.
Shifting use to off-peak hours isn’t just for HVAC. Your dishwasher, washing machine, and dryer cost less to run when used outside peak hours. For households that keep usage close to their baseline allowance and avoid heavy energy use from 4:00 PM to 9:00 PM, TOU plans offer even more savings.
Prices change seasonally, so prices can go up in the summer and down in the winter. Infrastructure upgrades and wildfire-related spending can send prices soaring, with a meaningful share of your bill going toward grid upgrades and wildfire-related costs.
Bill Analysis
A regular review of your bill provides homeowners with a transparent view of their consumption. By reviewing monthly statements, it is easier to catch when energy use surges. This assists users in detecting trends, such as increased consumption during cold months or when new appliances are added.
Recognizing the billing cycle aids in identifying peak periods. This simplifies planning for HVAC and appliance usage. By monitoring not only the overall energy consumed but also when and what energy is consumed, we can save by being smarter about our spending.
With these insights, homeowners can make choices like running the dryer after midnight or cooling the home before 4:00 PM. A lot of providers have online tools to analyze when and how energy is consumed. These tools can help identify savings and prevent bill shocks.
Long-Term ROI
Energy-efficient HVAC scheduling is not a quick band-aid. Over time, savings stack up and can influence annual budgets. This means that by keeping energy off-peak, season after season, you get a return.
Over time, the savings from these habits add up. Even minor adjustments, such as operating appliances at nighttime, accumulate over the course of a year. These savings can help offset increasing infrastructure or wildfire spending.
Thinking long-term, energy efficiency equates to less environmental footprint. Beyond the savings, using less power when the grid is under the most stress reduces emissions. This can boost value for sellers, as buyers seek out energy-smart homes.
My Unconventional Take
PG&E’s time-of-use (TOU) rates encourage customers to reconsider how they consume energy at home. The core idea is simple: shift high-energy tasks to off-peak hours, when prices drop by up to 30 percent. A lot of homeowners stay conservative, running laundry or dishwashers after 9:00 PM, but there is more room for creative thinking.
For example, rather than just deferring tasks to the evening, some homeowners set up smart-home routines. A smart thermostat can shift cooling to before 4:00 PM, or after 9:00 PM, when rates are cheaper. This lets you keep your home cool without overspending, even in the summer months when PG&E rates climb from June through September.
Most people know not to run a load of laundry during that 4:00 PM to 9:00 PM window, but the real savings come from a whole-home view of energy use. Pre-cooling your home in the early afternoon and then easing off the AC during peak hours is a good example. Others use timers or app-based overrides so their large appliances only run once off-peak rates begin.
That not only lowers prices, it distributes demand, which can alleviate pressure on regional grids. It’s not only about the economics; the lower peak demand also makes the entire power system more stable and sustainable. Flexibility is essential in today’s power landscape. Prices and peak times might change, particularly as solar panels or EVs become more commonplace.
A rigid, set-and-forget approach will not keep up. Smart devices and apps let you adjust as these shifts happen. For instance, if a utility modifies its peak hours, a smart thermostat or plug can be reprogrammed in minutes. The trick is to remain agile and use technology to keep pace with shifting regulations and rates.
This can be as basic as reminders or as sophisticated as machine learning features found in newer smart home equipment. Comfort counts as well. A lot of folks believe that energy savings always equate to discomfort, but with some planning, you can keep a space comfortable without raising your bills.
Fans or blinds in the afternoon, for instance, can keep your home cool, so the AC doesn’t have to. In winter, pre-heating before peak hours and adding a blanket or extra layer works well on the heating side. Every home is unique, so the optimal blend of tactics varies with the space, climate, and requirements.
Conclusion
Making the most of a PG&E time-of-use plan comes down to knowing your peak and off-peak hours, then running your HVAC less during the expensive late-afternoon window and more when rates are low. Seal air leaks, keep your filters clean, and lean on fans and window shading to hold comfortable temperatures with less runtime. Every home in the Sacramento Valley is a little different, so it pays to test a few of these strategies and see what works best for yours. Small, consistent changes can noticeably lower your bill while keeping your home comfortable through the summer heat. If you would like help dialing in your system or choosing the right equipment, the team at Pearce Heating & Air Conditioning is here to help.
Frequently Asked Questions
What is PG&E Time of Use (TOU)?
PG&E Time-of-Use (TOU) is an electricity rate plan where the price of power changes with the time of day. Using more of your electricity during off-peak hours, and shifting use out of the summer peak season, helps you save.
How can I schedule my HVAC system to save on TOU rates?
Pre-cool or pre-heat your home before the onset of peak hours. Employ a programmable thermostat to avoid expensive time period high energy use.
What are peak hours in a typical PG&E TOU schedule?
Peak hours are usually in the late afternoon to evening, for example, from 4:00 PM to 9:00 PM. Check your particular PG&E plan for exact timings.
Can smart thermostats help manage TOU schedules?
Indeed, smart thermostats have the ability to automatically customize your HVAC schedule for TOU rates. This helps minimize energy consumption and expenses during these peak periods.
What are common mistakes when scheduling HVAC for TOU plans?
Typical errors are operating your HVAC in peak or neglecting to make seasonal adjustments. Check your schedule often.
How much can I save by adjusting my HVAC schedule for TOU?
Savings vary based on your usage and rates. Most customers experience significant drops in monthly bills by moving energy consumption to off-peak periods.
Are there other ways to reduce TOU energy costs besides HVAC scheduling?
Sure, running your appliances during the off-peak hours and insulating your home better will save you money with TOU plans.