Long Island Heat Waves Are No Joke — Is Your Home Ready?
When a heat wave rolls through Suffolk and Nassau County, temperatures can climb into the mid-90s and stay there for days. That kind of sustained heat puts enormous strain on your air conditioning system — and on your family's comfort and safety.
The good news: a few smart moves before and during a heat wave can make a big difference. Here's what A1 Heating & Air Conditioning recommends to keep your home cool and your AC running efficiently when the heat is at its worst.
1. Set Your Thermostat Strategically
During a heat wave, resist the urge to crank your thermostat down to 65°F. Your AC system is designed to maintain a temperature roughly 20 degrees cooler than the outdoor air. When it's 95°F outside, asking your system to hit 68°F indoors puts it under extreme stress and can cause it to run continuously without ever reaching the setpoint.
A realistic target of 74–76°F keeps your home comfortable while allowing your system to cycle properly and avoid overheating. If you have a smart thermostat, use pre-cooling: drop the temperature to your target by mid-morning before the outdoor heat peaks in the afternoon.
2. Close Blinds and Curtains on South- and West-Facing Windows
Up to 30% of unwanted heat enters your home through windows. During a heat wave, direct sunlight streaming through south- and west-facing windows can raise indoor temperatures by several degrees — forcing your AC to work much harder.
Close blinds, shades, or blackout curtains on sun-exposed windows during the hottest hours (roughly 11 a.m. to 5 p.m.). This single step can reduce your cooling load significantly and help your system keep up.
3. Run Ceiling Fans to Boost Perceived Cooling
Ceiling fans don't actually lower the air temperature — but they create a wind-chill effect that makes a room feel 4–6 degrees cooler. Running ceiling fans allows you to set your thermostat a few degrees higher without sacrificing comfort, which reduces the load on your AC and lowers your electric bill.
Make sure your ceiling fans are spinning counterclockwise in summer (when viewed from below) to push air straight down and create that cooling breeze.
4. Avoid Heat-Generating Appliances During Peak Hours
Your oven, dishwasher, clothes dryer, and even your stovetop generate significant heat. Running these appliances during the hottest part of the day — typically 1 p.m. to 6 p.m. — adds to your home's heat load and makes your AC work overtime.
During a heat wave, shift cooking to early morning or evening. Use a microwave or outdoor grill instead of the oven. Run the dishwasher and dryer after 8 p.m. when outdoor temperatures begin to drop.
5. Check and Replace Your Air Filter
A clogged air filter is one of the most common reasons an AC system struggles during a heat wave. When the filter is dirty, airflow is restricted — your system can't move enough cool air through your home, and it may run continuously without ever reaching your set temperature.
Check your filter right now. If it's gray and visibly dirty, replace it with a fresh one (1-inch filters should be changed every 1–3 months). This is the easiest, cheapest thing you can do to help your AC perform at its best when you need it most.
6. Keep Vents Open and Unobstructed
It's a common misconception that closing vents in unused rooms saves energy. In reality, closing vents increases static pressure in your duct system, which can cause your AC to work harder and even damage the blower motor over time.
During a heat wave, keep all supply and return vents fully open and make sure furniture, rugs, and curtains aren't blocking airflow. Good circulation is essential for your system to cool your home evenly.
7. Clear the Area Around Your Outdoor Unit
Your AC's outdoor condenser unit needs adequate airflow to release heat efficiently. During a heat wave, the condenser is working at maximum capacity — and any obstruction makes its job harder.
Walk outside and check that there's at least 2 feet of clear space around all sides of the unit. Remove any debris, overgrown shrubs, or items stored nearby. If the condenser coils look dirty or clogged with grass and cottonwood, call us — a professional coil cleaning can restore efficiency quickly.
8. Watch for Warning Signs Your AC Is Struggling
Heat waves are when AC problems tend to surface. Watch for these warning signs that your system needs attention:
- Warm or lukewarm air from vents — could indicate low refrigerant or a failing compressor
- Ice forming on the indoor unit or refrigerant lines — a sign of restricted airflow or low refrigerant
- System running non-stop without reaching setpoint — may indicate the system is undersized or has a refrigerant leak
- Tripped circuit breaker — the system may be overheating due to a dirty condenser or electrical issue
- Unusual noises — grinding, banging, or squealing — mechanical problems that worsen under heavy load
If you notice any of these signs during a heat wave, don't wait. Call A1 Heating & Air Conditioning at 631-331-2102 — we offer 24/7 emergency service throughout Long Island.
9. Use the "Two-Degree Rule" for Overnight Cooling
On Long Island, summer nights typically cool down to the mid-70s or lower — much more manageable than the afternoon peak. If your home has cooled down overnight, take advantage of it: open windows in the early morning to flush out warm air and bring in cooler outside air before the day heats up again.
Close everything back up by 9 or 10 a.m. before outdoor temperatures start climbing. This pre-cooling strategy reduces how hard your AC has to work during the hottest part of the day.
10. Schedule a Tune-Up Before the Next Heat Wave
The best time to find out your AC has a problem is not during a 95-degree heat wave. A professional tune-up from A1 Heating & Air Conditioning includes a full system inspection, refrigerant level check, coil cleaning, electrical component testing, and airflow verification — everything needed to confirm your system is ready to handle whatever summer throws at it.
If your system is more than 10 years old, runs constantly, or has needed repairs in recent seasons, a tune-up is especially important. Catching a small issue now is far less expensive than an emergency breakdown in the middle of a heat wave.
Stay Cool This Summer — A1 Is Here When You Need Us
Heat waves on Long Island can be dangerous, especially for young children, elderly family members, and pets. If your air conditioning system isn't keeping up, don't tough it out — call the team at A1 Heating & Air Conditioning.
We've been serving Suffolk County homeowners since 2019 with honest, reliable HVAC service. Whether you need a quick tune-up, an emergency repair, or a full system replacement, we're available 24/7 at 631-331-2102.
