FPL Time-of-Use vs Flat Rate: How Your Plan Affects Port St. Lucie AC Costs

The Port St. Lucie Electric Rate Plan Nobody Talks About

FPL offers different rate structures, and most Port St. Lucie homeowners are on the default flat rate. But switching to time-of-use pricing — combined with a smart thermostat — can save 15–25% on your cooling costs. Here's how.

How Time-of-Use Works With Your AC

Time-of-use pricing charges more during peak demand (typically 2pm–7pm in summer) and less during off-peak hours. A smart thermostat can "pre-cool" your home to 72°F before peak rates kick in, then let it drift to 76°F during expensive hours. Your home stays comfortable because the thermal mass of your house holds the temperature for hours.

The Pre-Cool Strategy

• 11am–2pm: Smart thermostat cools home to 72°F at off-peak rate
• 2pm–7pm: Thermostat raises to 76°F — AC barely runs during expensive peak
• 7pm onwards: Back to normal schedule at off-peak rate
• Result: 60–70% less AC during peak hours = 15–25% monthly savings

Real Port St. Lucie Example

$280/month FPL bill → Switch to time-of-use + ecobee pre-cool scheduling → $195/month. That's $1,020/year saved with zero equipment changes. Add a smart thermostat ($249) and the investment pays back in 3 months.