Keep Cool & Stay Safe

Know the Signs of Heat-Related Illness

Heat-related illness can range from mild to life-threatening. Watch for: 

• dizziness or fainting 
• confusion 
• headache 
• nausea or vomiting
• extreme tiredness or weakness 
• extreme thirst
• decreased urination with unusually dark yellow urine

In young children, also watch for: 

• unusual sleepiness or irritability 
• reduced wet diapers or urination 
• flushed or very warm skin  

If you, or someone you are with, experience any of these symptoms, immediately move to a cool place and drink liquids to stay hydrated. Water is best.

Heat stroke is a medical emergency

Call 911 immediately if you, or someone you are with is:

• confused
• unconscious
• getting worse or has stopped sweating

While waiting for emergency help:

• move to a cool or shaded area 
• remove extra clothing
• cool with water or apply cool cloths to skin or clothing
• do not give food or drinks if the person is confused, unconscious or unable to drink safely 

How to Keep Cool Outdoors

Dress for the heat

• Wear loose, light-coloured breathable clothing and a wide-brimmed hat.
• Protect yourself from the sun.

Drink water often

• Drink plenty of water, even before you feel thirsty.
• Add ice to help cool your body.

Avoid peak heat

• Limit time in the sun. Plan outdoor activities early in the morning or evening.
• Choose shaded or air-conditioned spaces.
• If you sleep outside during the day, try to sleep in the shade. Remember the shade moves, so try to sleep in a spot that will be shady for a few hours.

Know where to go to cool down

• Don’t wait until you feel unwell. Take a break for 2 to 3 hours in a shaded or air-conditioned space.
• The Heat Relief Network has 500 welcoming locations. Find one near you.
• Public parks and recreation facilities offer access to drinking water and washrooms. Find nearby locations.

Never leave people or pets in a parked vehicle

• Vehicles can heat up quickly, even with windows open.  
• Be sure to check the back seat before you lock the car.

How to Keep Cool at Home

Block the sun

• Close blinds or drapes during the day. 
• Use curtains, solar window film, or shade to help control light and reduce heat and sunlight coming through windows that face the sun.

Bring in cooler air

• Open windows at night when outdoor temperatures drop. 
• Place a portable fan near a window or door to draw in evening air. 
• Use draft stoppers or seal gaps to keep cool air inside.

Take a break in cool or air-conditioned spaces

• If you have an air conditioner, make sure it is working properly before periods of hot weather
• If possible, keep the rooms you use most often cool, especially sleeping areas.
• On very hot days, if your home is not air-conditioned, find an air-conditioned spot nearby where you can cool off for a few hours. This will help you cope with the heat.

Reduce indoor heat sources

• Limit use of appliances that generate heat, such as the oven, dryer or dishwasher.
• Choose no-cook meals and keep food preparation light and simple.

Take a cool shower or bath

• Helps to lower your body temperature quickly.

Monitor indoor temperature

• Use an easy-to-read digital room thermometer to check indoor temperature.
• If indoor temperatures are uncomfortable or stay above 26 degrees Celsius, go to a cooler indoor or air-conditioned space.
• Risk of heat illness increases with sustained indoor temperatures of 31 degrees Celsius or higher. Older adults, people with health conditions and others at risk of heat illness are recommended to seek cooling options. 

Check on others

• Call, text or visit neighbours, friends and family during hot weather. If possible, visit them in person to see how they are doing and whether their space is cool enough.
• If calling or texting, ask questions such as:
  • Are you drinking enough water?
  • Is your home cool enough?
  • How hot does it feel indoors? Do you know the temperature?
  • Do you need help getting to a cooler place?

• During extreme heat, check more often on people at higher risk, including older adults, especially those living alone, people with health conditions and those who work or are active outdoors.

How to Use Fans Safely

• Place your fan near an open window. Box fans are best.
• Plug fans directly into a wall outlet. If you need an extension cord, use one approved by the Canadian Standards Association (CSA).
• Do not use a fan in a closed room without open windows or doors to the outside.
• Fans do not cool air or lower the room temperature of a room. They help cool your body by moving air around and by evaporating sweat.
• Avoid blowing extremely hot air on yourself. This can increase the risk of heat exhaustion.
• If you do not feel comfortable opening your window to use a fan, choose other ways to keep cool. See the additional cooling tips on this page.
• Do not use fans when the temperature in a room is 34 degrees Celsius or higher. At very high temperatures fans can increase heat exposure instead of cooling you down. This is especially important for older adults and people taking certain medications who may have a decreased ability to sweat.

Who is at Greater Risk of Heat-Related Illness

• Older adults
• Infants and young children
• People with chronic illnesses/on certain medications
• People who work or are active outdoors
• People experiencing homelessness or housing instability

Talk to your health care provider (doctor, nurse or pharmacist) to learn whether your medication increases health risks during hot weather.

If you live alone, arrange regular check-ins with family, friends or neighbours during very hot days in case you need help. In-person visits can help identify signs of heat illness that may be missed over the phone or online.

Check on family, friends and neighbours

During heat warnings, call, text, video chat or visit people in-person who may be at higher risk, especially those living alone.

Car Safety in Hot Weather

If your child gets locked inside a car, or if you witness a child left in a hot car, call 911 immediately.

Temperatures inside a vehicle can heat up quickly during warm weather, creating a dangerous environment that may cause serious harm or death.

During the summer, as the outside air temperature increases, temperatures inside a vehicle can reach dangerously high levels. Opening the car window slightly or parking in the shade does not keep a vehicle at a safe temperature.

Why parked cars are dangerous

Young children, especially infants, are much more sensitive to heat than adults. Even on mild or warm days, rising temperatures inside a vehicle can lead to significant heat stress on children causing severe dehydration, heat exhaustion or heat stroke.

What parents and caregivers need to know

• Never leave a child in an unattended vehicle, even with the windows open.
• Teach children not to play in, on, or around vehicles.
• Always lock car doors and trunks when parked in the driveway or near your home so that children do not play in them and become trapped.
• Before leaving your vehicle, check that all children have exited the vehicle safely, including sleeping infants and young children.
• Check the temperature of your child’s car seat surface and seat belt buckles before use. Your child’s skin can be severely burned when coming in contact with car seat surfaces that are dangerously hot.
• Keep car keys out of reach and out of sight of children.