Whether caused by summer thunderstorms, winter ice, or high winds off the lake, power outages are an unfortunate reality for Michigan homeowners. While food spoilage and lost lighting are top of mind when the grid goes down, many homeowners forget about one of the most expensive appliances in their home: their heating and cooling system.
When power is abruptly lost—and especially when it suddenly surges back on—your furnace, air conditioner, or heat pump is vulnerable to electrical damage, component failure, and system strain.
At Lake Michigan Heating Cooling Plumbing, we want to help you protect your investment. Here is how you can prepare your HVAC system for unexpected power outages and handle them safely when they happen.
1. Install Whole-Home Surge Protection
When utility power is restored after a blackout, a massive spike of electricity—a power surge—often rushes through your home’s wiring. Modern HVAC equipment relies heavily on sensitive electronic control boards and microprocessors. A single severe power surge can fry these electronic components, leaving you with an expensive repair bill just as power returns.
While plug-in surge strips work for electronics, high-voltage appliances like air conditioners and heat pumps require dedicated protection. A whole-home surge protector, installed directly at your main breaker panel or outdoor disconnect box, shields your HVAC equipment from voltage spikes caused by grid restoration or nearby lightning strikes.
2. Know How to Safely Shut Down Your System During an Outage
If the power goes out, take a moment to turn off your HVAC system at the thermostat.
Why This Step Matters:
- Prevents Sudden Startup Strain: Leaving the system “on” means it will try to draw maximum current the split-second power comes back, compounding the electrical stress from grid restoration.
- Protects Compressors: Air conditioner compressors need a few minutes for internal refrigerant pressures to equalize after stopping. A sudden power flicker can force the compressor to restart against high pressure, potentially blowing a fuse or damaging the motor.
Once utility power is fully restored and stable, wait 5 to 10 minutes before turning your thermostat back on.
3. Keep Up with Routine Maintenance & Battery Replacements
Simple preventative maintenance ensures your system recovers smoothly after an outage:
- Replace Thermostat Batteries: Many modern digital thermostats rely on AA or AAA batteries to retain memory settings and schedules during an outage. Replace these batteries annually so your thermostat doesn’t reset to default settings when power drops.
- Keep Filters Clean: Operating an HVAC system with a clogged filter strains the motor. If power fluctuates, an already struggling motor is much more likely to overheat or trip a breaker.
4. Generator Safety for Heating and Cooling
If you rely on a portable or standby generator during power outages:
- Whole-House Standby Generators: Ensure your standby generator is professionally sized by an electrician to handle the heavy startup amperage (starting watts) of your central air conditioner or heat pump.
- Portable Generators: Never plug a central HVAC unit directly into a small portable generator unless equipped with a certified transfer switch. Running an HVAC unit on underpowered or fluctuating generator power can permanently burn out blower motors and compressors.
What to Do If Your HVAC System Won’t Turn Back On
If utility power has returned but your heating or cooling system isn’t responding:
- Check the Circuit Breaker: Check your main electrical panel to see if the circuit breaker for your furnace or A/C tripped during the outage. Flip it fully to “Off” and then back to “On.”
- Check the Outdoor Disconnect Switch: Ensure the outdoor shutoff switch near your A/C unit wasn’t tripped.
- Inspect the Thermostat: Confirm the thermostat display is active and set to the correct mode (Heat or Cool) and temperature.
If the system still refuses to start, runs loudly, or blows the breaker again, do not force it. An electrical surge may have damaged a capacitor, fuse, or control board.
Protect Your HVAC Investment with Lake Michigan HCP
Don’t let the next storm leave you stranded without heat or air conditioning.
At Lake Michigan Heating Cooling Plumbing, our certified technicians install whole-home surge protection, perform electrical safety inspections, and repair storm-damaged HVAC systems across West Michigan.
Want to protect your heating and cooling equipment before storm season hits? Contact Lake Michigan Heating Cooling Plumbing today to schedule a safety check or surge protection installation!