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How to Stay Safe, Cool, and Protect Your Home
Summer is getting hotter. If you live in Central Ohio or Southwest Florida, you’ve already felt the shift-longer stretches of abnormally hot weather, nights that never quite cool down, and air conditioning systems pushed to their limits. Extremely hot weather increases the risk of heat exhaustion and heatstroke, puts stress on your home’s cooling equipment, and can turn a routine July week into a genuine health emergency. This guide walks you through how extreme heat affects your body, which heat related illness symptoms demand action, and exactly what you can do to protect your home and family.
Key Takeaways
- Extreme heat waves are now more common in Central Ohio and Southwest Florida. During June–August 2024, Central Ohio recorded multiple stretches above 95°F with a heat index over 105°F-and the trend is accelerating.
- Heat exhaustion and heat stroke can develop quickly, especially for outdoor workers, children, and older adults, and require immediate action to prevent serious harm or death.
- A well-maintained air conditioning system, proper home insulation, and smart cooling habits dramatically reduce both health risks and energy bills during high heat.
- Dor-Mar Heating, Air Conditioning & Plumbing offers AC repair, installation, tune-ups, and Home Comfort Memberships to help homeowners stay safe during extreme heat.
Understanding Extreme Heat and Heat Waves
A heat wave generally means three or more consecutive days with high temperatures well above normal-typically highs above 90–95°F combined with a heat index above 100°F. The heat index is what the temperature actually feels like when you factor in humidity. In humid weather like Central Ohio and Southwest Florida experience, a 90°F day can feel like 105°F or more because your body can’t cool itself through sweat evaporation.
Here’s why this matters right now:
- Heat waves have become more frequent since the 1950s. The EPA reports that the number of heat waves in American cities has roughly tripled since the 1960s.
- Extreme heat exposure tripled between 1983 and 2016, meaning far more people are dealing with dangerously hot weather each summer.
- Central Ohio saw temperature departures of 4–6°F above long-term norms in June 2024, with more 90°F+ days than the region experienced in the 1990s.
- Southwest Florida is dealing with longer, more intense heat waves and warm nights where lows stay above 75°F, making overnight recovery nearly impossible.
- Marine heatwaves are now twice as likely as they were in 1980, reflecting how broadly climate change is reshaping weather patterns on land and sea.
The national weather service issues heat advisories and warnings when these conditions arise, but understanding what the numbers actually mean helps you plan ahead rather than react in a crisis.
How Extreme Heat Affects Your Body
Your body cools itself through two main mechanisms: sweating (which evaporates moisture to pull heat away from your skin) and vasodilation (widening blood vessels near the surface to release heat). When humidity is high, sweat doesn’t evaporate efficiently, and these processes break down. Here’s what happens next:
- When the heat index exceeds 100–105°F, your heart works significantly harder to circulate blood toward your skin. Blood pressure fluctuates, and dehydration accelerates as you lose fluids faster than you can replace them.
- Heat can cause dehydration and stress the heart and kidneys. Heat exposure can also lead to acute kidney injury and low-quality sleep, compounding the strain over several weeks of a persistent heat wave.
- Early signs of heat stress include headache, dizziness, heavy sweating, nausea, fatigue, and muscle cramps. These are your body’s warnings, not minor inconveniences-ignoring them is how heat exhaustion escalates.
- Hot nights with outdoor temperature lows above 75°F prevent your body from recovering. Your body temperature stays elevated, and each day of a multi-day heat wave becomes more dangerous than the last.
- Certain medications impair your body’s ability to regulate temperature. Diuretics increase fluid loss. Beta-blockers, ACE inhibitors, anticholinergics, and some psychiatric medications can reduce sweating, blunt thirst cues, or alter cardiovascular response. The CDC provides detailed guidance on which drug classes carry the greatest risk. Alcohol also impairs thermoregulation and should be limited in high heat.
- Heat waves can worsen chronic health conditions like heart disease, making it critical for anyone with ongoing medical issues to take extra precautions.
Heat-Related Illnesses: Signs, Symptoms, and When to Call 911
Understanding the difference between heat cramps, heat exhaustion, and heat stroke can save a life. Here’s how to identify each one and what to do.
Heat Cramps
Heat cramps are the mildest form of heat illness. They typically appear as painful muscle cramps or spasms in the legs or abdomen during or after strenuous physical activity in the heat.
- Move to a cool, shaded place and rest.
- Drink fluids or sports drinks to replace lost electrolytes and prevent heat cramps from worsening.
- Gently stretch and massage the affected muscles.
Heat Exhaustion
Symptoms of heat exhaustion include heavy sweating, weakness, and dizziness. You may also notice cold or clammy skin, a rapid but weak pulse, nausea, headache, and fatigue.
- Move to a cooler location-an air conditioned room, shaded area, or cooling center.
- Sip water or electrolyte drinks slowly. Drink plenty of fluids but avoid gulping.
- Loosen or remove excess clothing to cool down during heat stress.
- Apply cool, damp cloths or use an ice pack on the neck, wrists, or forehead.
- Heat exhaustion can lead to heat stroke if untreated. If confusion sets in, vomiting occurs, or symptoms don’t improve within about one hour, seek urgent medical attention.
Heat Stroke
Heat stroke is a life-threatening heat illness. Heat stroke occurs when core temperature exceeds 104°F (40°C). The skin may be hot and dry, or very hot and moist. Confusion, loss of consciousness, seizures, or delirium are common signs.
- Call 9-1-1 immediately if someone shows signs of heat stroke.
- Move the person to shade or an air conditioned space.
- Cool rapidly using cold packs, wet towels, or a cool bath while waiting for paramedics.
- Do not give fluids if the person is unconscious.
Older adults living alone, infants, and people with chronic diseases are most likely to progress quickly from heat exhaustion to heat stroke during a heat wave. Heat-related deaths in people over 65 reached 345,000 globally in 2019, underscoring how deadly these conditions can be for aging populations.
Who Is Most at Risk During Extreme Heat?
Not everyone faces the same level of danger during extreme heat. Some groups carry a significantly higher risk, and knowing who they are helps you protect the people around you.
- Adults over 65 have reduced ability to regulate body temperature and may not sense thirst as readily. Heat-related deaths increased significantly from 2000 to 2019, with older adults bearing the heaviest burden.
- Infants and young children depend entirely on caregivers to keep them cool and hydrated.
- Pregnant women face greater risk from overheating because of increased metabolic demands and blood volume changes.
- People with chronic conditions-heart disease, lung disease, diabetes, kidney issues-and those taking multiple medications are especially vulnerable.
- Outdoor workers in construction, landscaping, roofing, and agriculture face combined environmental and physical heat stress. Heat waves are the deadliest weather events in NYC, and much of that toll falls on those who work outside.
- People in homes without central air conditioning, particularly in older apartments or urban heat island areas with limited access to shade, face dangerous temperature inside conditions.
- Pets left outside or in uncooled spaces can suffer heat exhaustion and heat stroke too-dogs and cats cannot sweat efficiently. Never leave children or pets in a parked vehicle, even for a few minutes. Temperatures inside a car can climb 20°F in just 10 minutes.
Check on vulnerable populations like the elderly and young children during extreme heat. A phone call or brief visit during the first 48–72 hours of a heat wave with triple-digit heat index values can genuinely save a life. More than 70,000 Europeans died in the 2003 heat wave-many of them older adults living alone who had no one checking in.
Practical Ways to Stay Safe in Extreme Heat
When a heat wave hits, daily habits matter more than anything else. Here’s what works:
- Stay indoors in air conditioning during the hottest part of the day, roughly 11 a.m. to 6 p.m. If your home AC is unavailable, head to public cooling centers, libraries, or malls. Use air conditioning or fans to stay cool indoors whenever possible.
- Stay hydrated. Hydration is crucial during extreme heat-drink water regularly. When outdoors or in warm spaces, sip every 15–20 minutes. Drink plenty of water throughout the day and limit sugary, caffeinated, and alcoholic drinks, which dehydrate you.
- Wear lightweight, loose-fitting, light colored clothing. Wearing lightweight and light-colored clothing helps reduce heat buildup by allowing air to circulate and reflecting heat from the sun. Wide-brimmed hats and breathable footwear help during outdoor activities.
- Limit outdoor activities during the hottest parts of the day to avoid heat stress. Adjust schedules to perform strenuous activities in the early morning or late evening when cooler temperatures prevail.
- Use fans wisely. Fans help circulate air when indoor temperatures are below about 95°F, but in very high temperatures, fans alone just blow hot air around and cannot prevent heat illness without AC.
- Cool down actively. Taking cool showers or baths can lower your body temperature effectively. Damp washcloths on your neck and cool foot baths are low-cost options that work.
- Dor-Mar can help. If your AC isn’t performing before or during a heat wave, Dor-Mar offers emergency AC repair to get your home back to a safe, cool space quickly.
Protecting Outdoor Workers and Active Families
If you work in your yard, coach youth sports, or have kids in summer activities, extreme heat demands a different approach to your schedule.
- For homeowners working on DIY projects, roofing, or yard work, schedule heavy tasks in the early morning before 10 a.m. Rotate between physically demanding and lighter tasks, and take frequent shaded breaks.
- When the heat index climbs above 90°F, add extra breaks and push hydration. Above 103–105°F, minimize intense outdoor work entirely when possible.
- Use shade structures, pop-up tents, and cooling towels. These are inexpensive and can lower perceived temperature significantly for outdoor workers and kids at practices.
- Coaches and parents should shorten practices, increase water breaks, and actively watch for early symptoms of heat exhaustion in players during heat waves. Remove excess clothing and move anyone showing signs of distress to a cool area immediately.
- Garages, attics, and sheds can be 20–40°F hotter than the outdoor temperature. Ventilate these spaces before entering and avoid prolonged work inside them during afternoon peak heat.
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Cooling Your Home: AC, Ventilation, and Smart Energy Use
Your cooling system is your first line of defense during extreme heat. Making it work efficiently protects both your health and your wallet.
- Central air conditioning, ductless mini-splits, and window units each keep indoor temperatures in a safe range-generally 72–78°F depending on comfort and health needs. Mini-splits avoid duct losses and work well in hard-to-cool zones. Window units are useful backups but must be sized correctly for the room.
- Air conditioning also reduces indoor humidity, lowering the heat index inside your home and reducing the risk of mold and discomfort. Keeping indoor relative humidity around 40–50% makes a room feel cooler at the same thermostat reading.
- Programmable or smart thermostats help prevent system strain by adjusting the temperature inside when you’re away, rather than forcing the system to recover from extreme highs.
- On cooler evenings, safely open windows for cross-ventilation when the outdoor temperature and humidity drop. Use bathroom and kitchen exhaust fans to push out hot, moist air.
- Keep blinds and curtains closed on sun-facing windows during the day. Reflective shades or window films can reflect heat and reduce cooling load noticeably in rooms that overheat.
- Seal air leaks around windows and doors and add attic insulation to keep cold, conditioned air inside during a heat wave. These improvements help your AC run less and last longer.
- Dor-Mar provides AC installation and replacement, repair, maintenance, and indoor air quality solutions designed for the climate challenges of Central Ohio and Southwest Florida.
Why AC Maintenance Matters in Extreme Heat
Extreme heat puts maximum stress on your air conditioner. Systems that haven’t been maintained are far more likely to break down on the hottest day of the year-exactly when you need them most.
- Core maintenance tasks: cleaning or replacing air filters, checking refrigerant levels, cleaning condenser and evaporator coils, inspecting electrical connections, clearing condensate drains, and testing overall system performance.
- Efficiency gains: a well-maintained system can cool more effectively and use less electricity. Dirty coils and clogged filters force the system to work harder, increasing energy bills during long heat waves.
- Dor-Mar’s Home Comfort Membership includes annual or seasonal tune-ups, priority service, and potential discounts on repairs-helping homeowners avoid surprise breakdowns in July and August.
- Schedule AC maintenance before peak summer. But if your system is already struggling, emergency repair services are available when systems fail during a heat wave.
Indoor Air Quality and Humidity Control in Hot Weather
High humidity during hot weather makes rooms feel hotter than the thermostat says and creates ideal conditions for mold and dust mites.
- Modern air conditioning systems dehumidify air by passing it over cold evaporator coils, condensing moisture out along with heat. This is why running your AC in humid weather does more than just lower the temperature.
- Supplemental solutions like whole-home dehumidifiers and proper bathroom and kitchen ventilation help maintain relative humidity around 40–50%.
- Good indoor air quality-clean filters, proper ventilation, and air purification when needed-is especially important for people with asthma or COPD during hot, stagnant weather when outdoor air quality also declines.
- Dor-Mar can assess indoor air quality, recommend filtration and dehumidification upgrades, and ensure the AC system is sized correctly for both cooling and moisture removal in your specific home.
Preparing Your Home Before a Heat Wave Hits
The best time to deal with extreme heat is before it arrives. Here’s a pre-season checklist:
- Test your AC early. Turn on and run the system in late spring-April to May in Ohio, March to April in Florida-to catch issues before the first major heat wave.
- Change filters and clear the outdoor unit. Remove debris around the condenser, and check that vents and registers aren’t blocked by furniture or curtains.
- Make simple improvements. Add weatherstripping, seal duct leaks, improve attic insulation, and install ceiling fans to enhance comfort and reduce cooling load.
- Build a heat safety kit. Stock water, electrolyte drinks, lightweight clothing, battery-powered fans, flashlights, and a list of local cooling centers.
- Schedule a professional tune-up. A Dor-Mar AC tune-up is especially valuable for older systems approaching 10–15 years of age, where hidden problems are most likely to surface during peak demand.
Staying Safe During Power Outages in Extreme Heat
When the power goes out during a heat wave, homes heat up fast-especially upper floors, mobile homes, and poorly insulated spaces.
- Act quickly. Move to the coolest room or basement. Use battery-powered fans, close curtains, and avoid using gas stoves or ovens that add indoor heat.
- If the temperature inside becomes unsafe, go to a friend’s home with power, a community cooling center, or any air conditioned public space. Don’t wait until you feel symptoms.
- People with limited mobility, those who rely on medical equipment, or anyone especially sensitive to heat should have an emergency plan and backup contacts established before summer begins.
- Once power returns, monitor your AC system closely. If it short-cycles, struggles to cool, or makes unusual noises or smells, consider having Dor-Mar inspect it to prevent further damage.
Extreme Heat, Energy Bills, and Long-Term Home Upgrades
Long stretches of 90–100°F days keep AC systems running almost constantly, and monthly energy bills reflect it. Here’s how to manage costs without sacrificing safety:
- Use programmable thermostats and set reasonable targets-76–78°F when home, slightly higher when away. Even a few degrees of adjustment makes a meaningful difference in saving energy.
- Zoning systems allow you to cool occupied rooms without wasting energy on empty ones.
- Long-term upgrades deliver the biggest returns: energy efficient AC units with higher SEER ratings, heat pumps suitable for both cooling and heating, and improved insulation and windows. Upgrading from a 14 SEER to 16 or 18 SEER system can reduce cooling energy consumption by 20–30%. Heat pump systems are increasingly popular in both Central Ohio and Southwest Florida for their year-round energy efficiency.
- Check for potential rebates or incentives for high-efficiency cooling equipment. These can offset initial costs and improve the payback period, especially in regions with long, hot summers.
- Dor-Mar can size and recommend the right air conditioner or heat pump for your home, climate, and budget, with free estimates for replacements.
How Dor-Mar Helps You Stay Safe and Comfortable in Extreme Heat
Dor-Mar Heating, Air Conditioning & Plumbing has been a family-operated home comfort provider since 1962, serving Central Ohio and now Southwest Florida. We understand how local weather patterns stress both people and hvac equipment.
- Core services: air conditioning repair, AC installation and replacement, heat pump services, ductless systems, and emergency cooling repairs during heat waves.
- Supporting services: plumbing checks for reliable water supply during extreme heat, electrical services for safe AC operation, and indoor air quality solutions.
- Home Comfort Membership: preventive maintenance visits, priority scheduling, and potential savings on repairs help homeowners avoid breakdowns during the hottest days of summer.
- Decades of local expertise. We know that a home in Gahanna, Ohio faces different cooling challenges than one in Cape Coral, Florida, and we tailor recommendations accordingly.
Ready to protect your home? Schedule an AC tune-up, repair, or free estimate online or by phone before the next major heat wave arrives. The best time to prepare is before the forecast turns red.
FAQ: Extreme Heat, Health, and Home Cooling
What indoor temperature is safest during an extreme heat wave?
For most healthy adults, keeping the temperature inside between about 72–80°F is generally safe during extreme heat. Infants, older adults, and people with chronic conditions should aim for the lower end of that range. If indoor temperatures climb above 85°F-especially overnight-vulnerable individuals face a much higher risk of heat related illness and should move to a cooler environment.
How often should I change my AC filter during very hot weather?
Check your filter at least once a month during peak summer and replace it every 30–60 days, or sooner if it looks dirty or clogged. Homes with pets, smokers, or allergy sufferers may need changes every three to four weeks to maintain proper airflow and system efficiency. A restricted filter forces your system to work harder, increasing energy use and raising the risk of a breakdown when you need cooling most.
Are portable or window AC units a good alternative if I don’t have central air?
Portable and window AC units can effectively cool single rooms or small spaces and serve as useful backups during emergencies. However, they are generally less energy efficient than properly sized central systems and may struggle in very high humidity. Size the unit correctly for the room, follow manufacturer installation instructions, and make sure you’re not overloading electrical circuits-using a dedicated outlet is safest.
How do I know if my AC system is struggling because of extreme heat?
Common signs include the system running nonstop without reaching the thermostat setting, weak airflow, warm air from vents, ice forming on refrigerant lines, or unusual noises and smells. If you see ice or hear grinding, turn the system off to prevent further damage and call a professional. These issues often indicate low refrigerant, a failing compressor, or restricted airflow-problems that worsen quickly under heavy summer demand.
When should I consider replacing my air conditioner instead of repairing it?
Consider replacement if your system is over 10–15 years old, needs frequent repairs, uses outdated refrigerant (like R-22), or consistently runs higher energy bills than comparable homes. Extreme heat often exposes weak or undersized systems that limp along in milder weather. Upgrading to a modern, high-efficiency AC or heat pump improves comfort, reliability, and long-term cooling options for future heat waves. Dor-Mar can help you weigh the costs and find the right system for your home.
