How hot is too hot inside your home as we face dangerous heat?

Millions across the United States are facing dangerous, record-smashing heat as we approach the Fourth of July weekend.

Heat advisories have been issued across Florida this week, and more are expected as we enter July.

The National Weather Service offices in the Sunshine State have repeatedly warned the heat index could reach as high as 112 in some areas and between 105 and 110 in others this week.

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Is it possible to be comfortable in your home without facing huge electric bills as temps soar outside?

In the battle over the thermostat, is there such a thing as too hot inside your home? Here's what you should know.

How hot is too hot inside your home?

The Centers for Disease Control said indoor temperatures should never exceed 90 degrees when people are inside.

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"Setting your AC any higher - or allowing a home to heat up beyond this threshold - is dangerous."

Others set the bar even lower.

"The absolute highest you should set your thermostat is around 82 degrees," said Hansensupertechs.com.

Battle over thermostat. What's the best temp?

"On average, most people are comfortable with the thermostat set around 70 to 75.

"However, some might prefer it as low as 68 or as high as 78," according to hansensupertechs.com.

Remember, the lower the setting and the hotter it is outside, the harder your ac has to run and the more you'll pay.

Do ceiling fans help keep things cool in your home?

If temperatures inside your home hit 90 degrees or higher, using a fan can actually increase your body temperature and increase the risk of severe heat-related illnesses, according to the CDC.

➤ Florida braces for 'dangerous' heat ahead of Fourth of July

If you do run your ceiling fan, make sure the blades are turning counterclockwise to move air down and generate a breeze you can feel.

Turn off ceiling fans when no one's in the room, the U.S. Department of Energy advised.

So what should you set your thermostat at?

Many experts and energy companies suggest 78 degrees is a good thermostat setting.

➤ How to bring energy costs down in Florida heat and still stay cool

Bumping your thermostat setting up even one degree could save you 5% on cooling costs, according to FP&L.

Turn thermostat up, but not off, when you're away or overnight to save money

You can save up to 10% on cooling bills by bumping the thermostat up by 7 to 10 degrees for eight hours a day, so try it while you are working or sleeping, according to the Department of Energy.

Don't turn it off.

Your air conditioner needs to run often enough to remove humidity and prevent mold growth, Trane said.

When you're out of the house for an extended period, FPL recommended setting your thermostat to 82 degrees with the fan on "auto."

What if it's over 100 outside? Should I change my thermostat setting?

On days when temps get over 100 degrees, a good temperature setting is 75 to 78 degrees, depending on your comfort level, according to econoair.com.

"If your system is sized properly for your home, it is designed to achieve a 30-degree temperature difference at 105 outside temperature. For example, 105 degrees outside, 75 degrees inside."

4 things that prevent AC from working efficiently on 100-plus degree days

There are four things that could impact your air conditioner's ability to keep you cool when temps soar above 100 degrees, according to cleartheairac.com.

Here's what they are and what you can do about them:

• Dirty filter: A dirty filter can cut airflow by 20% to 40%. The system runs longer, the coil can freeze, and the supply air at the registers warms up.
  • What to do: Change filters every 30 to 90 days. When temps hit 100, check your filter weekly.
• Blocked outdoor unit: The condenser needs unobstructed airflow to reject heat.
  • What to do: Hose the outdoor coil clean monthly during summer, after powering the unit off. Keep 2 feet of clearance on all sides.
• Open doors and windows: Every time the door opens on an extremely hot day, you let in hot, humid air the system has to remove.
  • What to do: Keep the house closed up as much as you can. Run kitchen and bath exhaust fans only as needed; they pump out the air you just paid to cool.
• Extra heat: Don't add more heat inside your air conditioner has to cool.
  • What to do: Cook outside when you can. Use the dryer in the evening. Close blinds on south- and west-facing windows during peak sun hours. Switch to LED bulbs.

Who faces highest risk for heat-related illnesses?

Although anyone can suffer from heat-related illnesses, some people face a greater risk, according to the CDC. That includes:

• People, especially children, with asthma.
• People with heart disease.
• Pregnant women.
• People 65 years of age or older.
• People who are working or exercising outside in the heat.
• Infants and young children.

Heat stroke vs. heat exhaustion symptoms to watch for:

Heat exhaustion

• Symptoms: Heavy sweating, Weakness or tiredness, cool, pale, clammy skin; fast, weak pulse, muscle cramps, dizziness, nausea or vomiting, headache, fainting,
• First aid: Move person to a cooler environment, preferably a well-air-conditioned room. Loosen clothing. Apply cool, wet cloths or have person sit in a cool bath. Offer sips of water. If person vomits more than once seek immediate medical attention if the person vomits, symptoms worsen or last longer than 1 hour.

Heatstroke

• Symptoms: Throbbing headache, confusion, nausea, dizziness, body temperature above 103°F, hot, red, dry or damp skin, rapid and strong pulse, fainting, loss of consciousness.
• First Aid: Call 911 or get the victim to a hospital immediately. Heat stroke is a severe medical emergency. Delay can be fatal.
• Move the victim to a cooler, preferably air-conditioned, environment. Reduce body temperature with cool cloths or bath. Use fan if heat index temperatures are below the high 90s. A fan can make you hotter at higher temperatures.
• Do not give fluids.

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How can you stay cool in extreme Florida heat?

Heat is one of the leading causes of weather-related deaths in the United States, according to the Centers for Disease Control, so it's important to heed warnings when temps and the heat index climb.

Here are a few ideas to help you stay cool:

• Drink plenty of water.
• Take a shower, jump in a pool, pour a bottle of water over your head, or use a mister. Water helps your body cool off.
  • Tempting though it may be, don't take a cold shower. Your core temperature will actually increase.
• Use a wet cooling cloth or even a bandana, especially on your wrists, ankles and the back of your neck.
• Wear loose clothing in breathable fabric. Make sure they're light-colored.
• Sleep on the ground floor or the basement if you're lucky enough in Florida to have one.
• Try to spend part of your day in a public place that's cool, such as a mall, library or movie theater.

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Contributor: C.A. Bridges, USA TODAY Network-Florida

Cheryl McCloud is a journalist for the USA TODAY Network-Florida's service journalism Connect team. You can get all of Florida's best content directly in your inbox each weekday day by signing up for the free newsletter, Florida TODAY, at https://tallahassee.com/newsletters.

This article originally appeared on Tallahassee Democrat: How hot is too hot inside your home as we face dangerous heat?

Reporting by Cheryl McCloud, USA TODAY NETWORK - Florida / Tallahassee Democrat

USA TODAY Network via Reuters Connect

Copyright Reuters or USA Today Network via Reuters Connect

This story was originally published June 30, 2026 at 1:16 PM.