FPL Blog



It's all about you

Featured Posts

Ensuring Reliability

Energy Efficiency

Craig Muccio

About "Ask the Energy Expert"

Craig Muccio runs FPL's Conservation Research & Development Program and crunches the numbers to figure out how you can save by managing your energy use.

Your questions on energy-related topics can be submitted anytime to our Ask the Energy Expert blog. Just click here to submit your question, and if chosen, it will be answered here

The best A/C settings if you're away during the day

By Craig Muccio

Asked on: August 31, 2015 by Patricia S., Boca Raton

If no one is home during the day, should we turn the A/C off or keep it on at a higher temp?

Great question, I’m sure many of our customers wonder the same thing. In this case, your savings will be maximized if you turn off the A/C when you are not home.  However, depending on how much your home heats up during the day and how fast your A/C can cool it down, turning it off completely may make you uncomfortable for a while after you get home.  

Thermostats & Settings
If you only have a manual thermostat, you will have to experiment with the daytime temperature setting that works best for you. If you have a programmable thermostat, you can try setting the temperature as high as it goes while you are out with it programmed to return to your preferred temperature an hour before you get home. If that is not sufficient to pre-cool your home, try resetting your A/C to return to your preferred temperature sooner or try a lower temperature while you are out during the day. Some newer thermostats even let you check the temperature inside your house and remotely change the thermostat setting from your computer or mobile device before you head home.  Now, if you are wondering what temperature to leave the A/C on for your pet during the day, I think I will leave that question for your vet to answer! 

Multiple Units
Do you use more than one air conditioner to cool your home?  If so, the same suggestions apply.  When you are home, you can save by running only the A/C unit in the part of the house you are using at the time.  Just remember that cooling two separate zones works best if you can close off the area of the home where you are running the air conditioner from the other part where the A/C is turned off. 

Risks of Mold
Some customers wonder if setting the thermostat too high in the daytime might encourage mold growth.  Humidity is highest during the cooler early morning hours.  As temperature rises during the day, the relative humidity actually goes down, which discourages mold growth.   As long as your A/C runs for a few hours a day, your home should be sufficiently dehumidified to fend off that musty smell of mold.

Your safety is very important to us. If this is a medical emergency, please call 911 immediately or go to your nearest emergency room. For non-emergencies, you can reach us during regular business hours via Facebook private message, or follow and message us on Twitter and one of our representatives will assist you. To report an outage, please call 1-800-4-Outage. Thank you and please stay safe.

Leave a Comment

Join the conversation with FPL on ways to save energy and keep your bill low.

Plus, learn how we are constantly working to deliver you reliable service.

Please note that this blog is not monitored 24/7.

For customer service questions: www.FPL.com/contact

To report an outage: www.FPL.com/outage

Your email address will not be published. Required fields are marked *



Comment moderation is enabled. Your comment may take some time to appear.

Comments [235]