How to Protect Your HVAC System During Power Surge in Canada

Your AC is tougher than a Timbit left out in January—but even it can’t take a power surge head-on. With power grids across Canada getting moodier thanks to increased energy demand, unpredictable weather, and aging infrastructure, it’s not just your lights that flicker when things go sideways. Your HVAC system—your best friend in both sweltering summers and frosty winters—is just as vulnerable during blackouts. 

Let’s break down how to protect your HVAC system during power outages, what to do when the power returns, and why HVAC surge protection is like the goalie in your furnace’s playoff game. 

Why HVAC Surge Protection in Canada Matters—A Lot 

Power surges are sudden voltage spikes that can cause serious damage to your home’s heating and cooling systems. These surges usually happen during storms, grid failures, or when the electricity kicks back in after a blackout. And guess what? The more electronics and large appliances you have at home, the higher the stakes. 

When a surge hits, it’s like sending 10,000 volts into your HVAC system. That kind of electrical whiplash can fry your compressor, blow capacitors, burn out control boards, and even kill your unit completely. 

What Surges Can Do to Your AC or Furnace: 

• Overheat and short-circuit your motors 
• Burn up capacitors and control boards 
• Cause compressor failure (this one’s the big, expensive fix!) 
• Lead to costly repairs or full replacements 

If you’re thinking, “It’s probably fine,” just remember: HVAC systems aren’t cheap. Why risk it when HVAC surge protectors are your first and most affordable line of defence? 

What to Do Before a Power Outage 

Storm’s coming? Here’s how to prep like a pro—whether it’s +30°C or -30°C outside. 

✅ For Summer Power Outages: 

1. Turn off your AC at the thermostat AND breaker – This protects the system from damage when power is restored.
2. Close blinds and curtains – Keep the cool air inside and block heat from the sun.
3. Prep battery-powered fans and flashlights – Keep air moving and lights on safely.
4. Stock up on ice packs and frozen water bottles – These act as DIY coolers and hydration backups.
5. Book a seasonal AC tune-up – A clean, healthy system is less vulnerable when the power goes out.

❄️ For Winter Blackouts: 

1. Shut off your furnace at the breaker and thermostat – The same surge risk applies in winter.
2. Layer up and stick to one room – Choose the warmest, most insulated room.
3. Seal windows and door gaps – Heavy curtains, towels, or draft blockers work great.
4. Use safe heating alternatives – Hot water tubs, battery-powered heaters, or safe, outdoor-use generators.
5. Insulate your pipes – Burst pipes = a winter nightmare. Keep taps dripping to prevent freezing.

🔁 What to Do After the Power Comes Back 

Tempted to crank the heat or AC the second power returns? Hold your moose—give it a few! 

Your HVAC “Power-Back Checklist”: 

1. Wait at least 30 minutes – This gives the grid time to stabilize. Surges often follow the initial return of power.
2. Inspect your breaker box – If it’s tripped, turn it fully OFF, then ON. If multiple breakers are tripped, call a licensed technician.
3. Restart your thermostat – Set it to your preferred temperature and observe. If it’s unresponsive or making weird sounds, stop and call a pro.
4. Listen, smell, and watch – Unusual noises, burning smells, or no airflow? Shut it down immediately and call for help. 

Remember: electrical damage isn’t always visible, so don’t assume things are working just because they’re running. 

⚡Why Surge Protectors Are HVAC Superheroes 

You wouldn’t ride a bike in traffic without a helmet—so why run your furnace or AC without a surge protector? 

A surge protector for HVAC systems is a small investment that could save you thousands. It acts as a buffer between your HVAC unit and any rogue electricity surges, keeping everything from your AC compressor to your smart thermostat safe. 

Two Main Types of HVAC Surge Protection: 

1. Whole-Home Surge Protector
   

   Installed at your main electrical panel
   Shields ALL appliances and electronics in your home
   Great for homes with multiple expensive devices 

2. Dedicated HVAC Surge Protector 

   Installed right at your AC or furnace
   Tailored protection for your heating and cooling systems
   Offers a direct line of defence 

👉 Pro Tip: Use both for double-layered protection—think of it as putting a helmet and a seatbelt on your HVAC. 

🛠️Don’t Forget the Power of Routine Maintenance 

If surge protectors are your HVAC’s helmet, then seasonal tune-ups are its vitamins. 

Regular HVAC maintenance ensures that: 

• Your system can bounce back faster after outages 
• Minor issues are caught before becoming major repairs 
• Your equipment lasts longer and runs more efficiently 
• You maintain warranty coverage (many require annual service!) 

In the Canadian climate, where temperatures swing from one extreme to the other, a well-maintained system is your best friend year-round. 

📉 Blackouts Are Becoming More Common in Canada 

Between climate change, increased demand, and aging infrastructure, power outages across Ontario and Canada are on the rise. Whether it’s an ice storm, a wildfire, or a sweltering heat wave, it’s crucial to keep your HVAC system protected and ready for anything.

Surge-proofing your home isn’t just a luxury—it’s a smart, proactive move that keeps you comfy, safe, and stress-free no matter what Mother Nature throws your way. 

🔧 LG Home Comfort Has Your Back 

From surge protector installation to seasonal furnace or AC tune-ups, LG Home Comfort is your trusted HVAC partner. We’re proudly Canadian and proudly prepared—for every winter storm, summer heatwave, and everything in between.

We specialize in: 

• HVAC surge protector installation 
• Furnace and AC repairs and maintenance 
• Energy-efficient upgrades 
• Friendly, professional service across Ontario 

📞 Ready to Future-Proof Your HVAC? 

The best time to install surge protection was yesterday. The second-best time? Right now. Don’t wait for your HVAC system to take a hit. Protect it today and avoid getting left in the heat… or the cold. 

Contact LG Home Comfort: 

✅ Surge protector installation
✅ HVAC inspections and maintenance
✅ Seasonal tune-ups and system upgrades 

✅ Stay Cool. Stay Warm. Stay Ready. 

Your furnace, your AC, your comfort—it all matters. With power outages on the rise, surge protection isn’t just smart—it’s essential. LG Home Comfort keeps your home covered, while our partner brand LG Mechanical handles HVAC solutions for commercial spaces that can’t afford downtime.

Frequently Asked Questions

1. Can a power outage damage my AC or HVAC system?

Yes. Power outages can cause electrical surges that damage HVAC components like compressors, circuit boards, and motors. Installing a surge protector and shutting off your system during outages can help prevent costly damage. 

2. What should I do with my HVAC system during a power outage?

Turn off your HVAC system at the thermostat and circuit breaker. This prevents it from getting hit by a voltage surge when power is restored. Also, close doors and blinds to retain indoor temperature. 

3. How long should I wait to turn my AC or furnace back on after a power outage?

Wait at least 30 minutes. This allows the power grid to stabilize, reducing the risk of electrical damage. Check the breaker, then restart your thermostat and HVAC unit carefully. 

4. Do I need a surge protector for my HVAC system?

Absolutely. Surge protectors shield your HVAC from voltage spikes caused by outages, lightning, or grid failures. Whole-home and dedicated HVAC surge protectors offer layered protection. 

5. Is it safe to use my AC after the power comes back on?

Only after checking your system. Inspect for strange noises, smells, or a tripped breaker. If anything seems off, shut it down and call an HVAC technician to avoid further damage. 

6. How can I prepare my HVAC system for future blackouts?

Schedule regular maintenance, install surge protection, and have a blackout plan. A well-maintained system recovers faster and is less likely to suffer damage during outages.