Every summer, Environment Canada issues heat warnings across the GTA and York Region — and every summer, emergency rooms see a rise in older adults suffering from heat exhaustion and heat stroke. For families caring for an aging parent, those bulletins can feel genuinely alarming.
The good news is that most heat-related illness is preventable. With a little planning and consistent check-ins, you can help your parent stay safe and comfortable even when the thermometer climbs above 30°C. Here is what you need to know.
Why Older Adults Are More Vulnerable to Heat
Aging changes the body in ways that make extreme heat harder to tolerate. Older adults often have a reduced ability to sense thirst, so they may not realize they are becoming dehydrated. The sweating response that cools the body becomes less efficient with age. And many common medications — including diuretics, beta-blockers, and antihistamines — can interfere further with the body's ability to regulate temperature.
Chronic conditions such as heart disease, diabetes, kidney disease, and COPD add additional risk. If your parent has any of these, a heat wave deserves the same preparation you would give a winter ice storm.
Signs of Heat-Related Illness to Watch For
It helps to know the difference between the two main heat-related conditions:
- Heat exhaustion typically presents as heavy sweating, cool or pale skin, a fast or weak pulse, nausea, dizziness, and fatigue. The person is still sweating and conscious. Move them to a cool place, offer water in small sips, and apply cool cloths.
- Heat stroke is a medical emergency. Signs include a body temperature above 39°C, hot and red skin (which may be dry or damp), a fast and strong pulse, confusion, or unconsciousness. Call 911 immediately.
If you are ever unsure which you are dealing with, treat it as an emergency and call for help. It is always better to be cautious.
Practical Steps to Protect Your Parent Before a Heat Wave Hits
1. Check the air conditioning situation now
Does your parent have a working air conditioner? Have it serviced before the hottest months arrive. If your parent's home does not have central air, a window unit or portable unit in the bedroom — where they sleep — is a worthwhile investment. Check that ceiling fans are turning counter-clockwise in summer to push cool air downward.
2. Know their local cooling centre
During declared heat emergencies, most municipalities in the GTA and York Region open designated cooling centres — public libraries, community centres, and recreation facilities where anyone can go to get out of the heat. Find out where the nearest one is to your parent's home before you need it. Most local municipal websites post updated lists each spring.
3. Review medications with their doctor or pharmacist
Ask whether any of your parent's current medications affect heat tolerance or hydration. A pharmacist is an excellent and often underused resource for this kind of conversation. Never adjust medications on your own, but being informed means you can raise the right questions.
4. Stock the fridge with hydrating foods and drinks
Many older adults resist drinking plain water throughout the day. Help by keeping the fridge stocked with options they actually enjoy: chilled herbal tea, diluted juice, sparkling water, yogurt, sliced cucumbers, watermelon, and other water-rich foods. Warm soups and salty snacks in moderation can also help maintain electrolyte balance — ask their healthcare provider what is appropriate given their conditions.
During a Heat Wave: Daily Habits That Make a Difference
- Close blinds and curtains on south- and west-facing windows during the hottest part of the day (usually between noon and 5 p.m.) to block radiant heat.
- Encourage light, loose clothing in natural fabrics like cotton or linen.
- Limit outdoor activity to early morning or after sundown if your parent enjoys walking or gardening.
- Check in by phone or in person at least twice a day during an extreme heat event — once in the morning and once in the afternoon when temperatures peak.
- Keep a spray bottle of cool water near their favourite chair so they can mist their face and wrists easily.
When You Can't Be There Every Day
This is where many families feel the pressure most acutely. You might work full-time, live across town, or be managing your own household with children at home. Daily in-person check-ins during a heat wave may simply not be possible.
A consistent in-home companion can make a significant difference. Having a familiar, trusted person visit your parent during a heat event means someone is there to notice early warning signs, encourage hydration, ensure the home is as cool as possible, and call for help if needed. It also means you get a reliable update — not just a brief phone call where your parent says "I'm fine, don't worry."
If you are exploring companion care for your parent in the GTA or York Region, Hearthlane is launching in 2026 with a focus on consistent, same-caregiver visits. You are welcome to join the waitlist now so you are among the first to arrange care when it opens.
After the Heat Wave Passes
Do not assume the risk disappears the moment temperatures drop. Dehydration and exhaustion can linger for several days. Continue encouraging fluids, watch for lingering confusion or unusual fatigue, and follow up with your parent's doctor if anything seems off. If they did experience heat exhaustion during the event, a brief medical check-in is a sensible precaution.
A Note on Planning Ahead Each Year
Ontario's hottest stretches tend to arrive between late June and mid-August, though heat warnings have been issued as early as May and as late as September in recent years. Building a simple "heat plan" into your family's spring routine — reviewing the AC, updating the medication list with the pharmacist, identifying the nearest cooling centre — takes less than an afternoon and can genuinely protect your parent when the season turns.
The goal is not to alarm, but to prepare. And in this case, a little preparation goes a very long way.