Ice Storms and Power Outages: Keeping Carlisle Homes Warm

What actually stops working, and why

• Gas furnace: the blower, inducer, ignition control, and gas valve are all electrically operated
• Oil furnace: the burner motor, fuel pump, ignition transformer, and blower all need power
• Boiler: circulator pumps and zone valves stop, so even if the boiler could fire, heat does not move
• Heat pump: entirely electric, including the auxiliary strip heat
• A standing-pilot gravity system, if you happen to have one, is the rare exception — and almost nobody does anymore

Generators: the right way and the deadly way

A generator can absolutely keep your heat running. Doing it wrong kills people every winter in Pennsylvania.

• Never run a generator in a garage, basement, crawlspace, or under a deck — including with the door open. CO accumulates far faster than most people believe.
• Place it at least 20 feet from the house with the exhaust pointed away from doors, windows, and vents
• Never back-feed through a dryer outlet or an extension cord into a wall receptacle. It energizes the utility line and can kill a lineman working to restore your power.
• Use a properly installed transfer switch, wired by an electrician. That is the correct and legal way to run a furnace from a generator.
• Size it for the startup surge, not just the running load — a furnace blower draws several times its running current at start
• Have working CO alarms regardless. Every year people die from a generator they were certain was far enough away.

Safe heating without a generator

• A properly maintained, correctly vented fireplace or wood stove — the safest non-electric option, if you have one and its flue is in good condition
• UL-listed propane or kerosene heaters rated and labeled for indoor use, following the manufacturer’s ventilation requirements exactly
• Consolidate everyone into one room and close the doors — heating 200 square feet is far easier than heating the whole house
• Layer clothing and use sleeping bags rather than trying to warm the air
• Never a gas range or oven, never an outdoor propane heater, never charcoal. These are the sources that fill emergency rooms during every regional outage.

Protecting the house through a multi-day outage

• Open cabinet doors under sinks on exterior walls
• Run a pencil-width trickle from the fixture farthest from the main
• If temperatures will stay below freezing for days with no heat, consider shutting off the water at the main and draining the system
• Keep interior doors open to allow whatever heat exists to distribute
• Close curtains at night; open south-facing ones during daylight
• Move to a warming center if the house drops below the mid-fifties and there is no restoration timeline

What to do the moment power returns

Do not simply flip everything back on at once. Bring the heating system up deliberately.

• Set the thermostat to a moderate setpoint rather than 75°F — a house that has been cold for two days does not need to be shocked back
• Listen to the startup. Grinding, screeching, or a hard-start rattle after an outage points at a motor that took a hit
• Check for water. A heat pump that was iced when power dropped may have a meltwater mess under it.
• Check every faucet for flow. A pipe that froze may only reveal a split once it thaws and pressure returns.
• Reset any tripped GFCI outlets and check the condensate pump if you have one

Ice damming and heat pumps

Ice storms are particularly hard on outdoor heat pump units. Freezing rain coats the coil and the fan, the defrost cycle cannot keep up, and meltwater refreezes underneath into a solid shelf.

If your unit is encased in ice, do not chip at it — you will puncture the coil, which converts a nuisance into a several-thousand-dollar repair. Switch to emergency heat, let the ice melt naturally or with warm water, and have the defrost system checked afterward.

This is also the argument for riser-mounting outdoor units rather than setting them on a slab at grade. Clearance underneath keeps meltwater from building an ice shelf under the coil in the first place, which is why we mount that way as standard.

What to have in the house before the forecast turns

Ice storms are forecast days ahead, which makes them one of the few emergencies you can genuinely prepare for. The useful preparation is unglamorous and most of it costs very little.

The single highest-value item is a way to know the house is getting cold when you are not in it. A low-temperature alarm that sends an alert changes an undetected multi-day failure into a same-day response, and that is the difference between an inconvenience and a burst supply line.

• A low-temperature alarm that alerts your phone, particularly for a property you may leave
• Fuel: a full oil or propane tank before the storm, since deliveries stop when the roads ice
• A battery or crank radio, torches, and charged power banks rather than candles
• Water drawn off in advance, because well pumps stop with the power
• Knowledge of where the main water shutoff is and confirmation that it turns
• Blankets and warm layers staged in one room you intend to occupy

Documenting an outage event for a claim

If an outage leads to a freeze and water damage, the claim will be settled on evidence gathered in the first day, most of which is impossible to reconstruct later. Photographs cost nothing and are worth taking before anything is cleaned up.

The distinction insurers apply is usually between sudden accidental damage and gradual deterioration, so anything establishing that this was an event with a date matters. Outage notifications from the utility, weather records and timestamped photographs all support that.

Keep the damaged components rather than disposing of them, and get the mechanical system assessed even if it appears to work. A furnace that ran hard through a freeze, or one that was flooded and started afterwards, can have compromised controls that fail later without an obvious link to the event.