How to Keep Your Home Warm During a Power Outage
How to Keep Your Home Warm During a Power Outage
Winter power outages in the DMV are more common than most homeowners realize. Ice storms, heavy snow, and high winds can knock out power for hours or days, and when your heating system depends on electricity — even gas furnaces need electricity for the blower, controls, and ignition — your home cools rapidly. According to the U.S. Department of Energy (energy.gov), a well-insulated home loses approximately 1°F per hour during a power outage when outdoor temperatures are 20°F. A poorly insulated home can lose 3-5°F per hour.
At JDL HVAC & Plumbing Services, we receive calls every winter from DMV homeowners dealing with power outages and failed heating systems. Here’s how to prepare and stay safe.
Before the Outage: Preparation
Have a plan before winter storms hit. Insulate your home properly — every degree of insulation slows heat loss during an outage. Seal air leaks around windows and doors. Stock emergency heating supplies. Have the furnace professionally maintained.
| Emergency Heating Source | Safety Level | Heat Output | Cost | Runtime |
|---|---|---|---|---|
| Fireplace (wood) | Safe if maintained | 20,000-40,000 BTU | Cost of firewood | As long as wood lasts |
| Propane/kerosene space heater (vented) | Use with extreme caution, CO risk | 5,000-25,000 BTU | $100-300 + fuel | 8-12 hours per tank |
| Electric space heater (with generator) | Safe | 5,000 BTU (1,500W) | $30-100 + generator fuel | Depends on generator |
| Portable generator (powering furnace) | Safe if outside only | Powers full furnace | $500-2,000 + fuel | 8-12 hours per tank |
| Whole-house generator | Safest, most convenient | Powers entire home | $5,000-15,000 installed | Unlimited (natural gas) or 24+ hrs (propane) |
Never use outdoor-only heating devices indoors (charcoal grills, camp stoves, outdoor propane heaters). Carbon monoxide kills dozens of Americans every winter during power outages.
During the Outage: Staying Warm
Isolate one room. Choose an interior room on a middle floor and close all other rooms in the house. Move everyone into this room. Hang blankets over windows and doorways for extra insulation. Body heat from occupants will help maintain temperature.
Layer clothing. Multiple thin layers are warmer than one thick layer. Wear a hat indoors — you lose significant heat through your head. Use sleeping bags for sleeping since they’re warmer than blankets.
If you have a gas fireplace with a battery backup or standing pilot, it will work without electricity. If you have a wood fireplace, use it — this is exactly what it’s for. Keep the damper open while the fire is burning and close it when the fire is completely out.
Stay hydrated and fed. Your body burns more calories maintaining temperature in a cold environment. Eat regularly and drink warm fluids if you can heat water.
Protecting Your Plumbing During an Outage
When your home drops below 55°F, pipes in exterior walls, crawl spaces, and attics are at risk of freezing. Open cabinet doors under sinks on exterior walls. Allow cold water to drip from faucets served by exposed pipes. If you have a water main shut-off accessible from inside, know where it is in case a pipe bursts. If the power outage will last more than 24 hours and your home will drop below 45°F, consider a partial plumbing drain-down.
Generator Safety
If you have a portable generator, always run it outside — never in a garage, basement, or enclosed area, even with the door open. Position it at least 20 feet from any door, window, or vent. Connect appliances with heavy-duty extension cords — never plug a generator directly into a wall outlet (backfeeding) as this is illegal and potentially lethal to utility workers. A portable generator can power your furnace blower to restore heat if you have gas or oil heating.
Whole-House Generator Options
A whole-house standby generator ($5,000-15,000 installed) starts automatically when power fails and runs on natural gas or propane. It powers your entire home — furnace, lights, refrigerator, sump pump — without any action required. For DMV homeowners who work from home, have medical equipment needs, or simply want peace of mind, a whole-house generator is a worthwhile investment.
Frequently Asked Questions
How long can my house stay warm without heat?
A well-insulated home loses approximately 1°F per hour in a 20°F outdoor temperature. Starting from 70°F, you’d reach 55°F in about 15 hours and 45°F in about 25 hours. Poorly insulated homes lose heat 2-3 times faster. Concentrating occupants in one room with blankets extends comfort significantly.
Can I run my gas furnace during a power outage?
No — even gas furnaces require electricity for the blower motor, electronic ignition, and control board. Only gas fireplaces with standing pilot lights or battery ignition work without power. A generator can power the furnace blower.
What size generator do I need to run my furnace?
Most residential furnaces require 800-2,000 watts for the blower motor, control board, and ignition. A 3,500-5,000 watt portable generator can power the furnace plus basic essentials. A whole-house generator (12,000-22,000 watts) powers everything.
Does JDL install generators?
JDL HVAC & Plumbing Services can advise on generator sizing for your HVAC system and coordinate with licensed electricians for installation. We also ensure your furnace is properly maintained for reliable operation when power is restored. Call (844) 535-4822.
Serving the Greater DMV Area
JDL HVAC & Plumbing Services proudly serves homeowners across Maryland, Virginia, and Washington D.C.
Maryland: Laurel | Bowie | Crofton | Upper Marlboro | Columbia | Annapolis | Odenton | Severn | Glen Burnie
Virginia: Northern Virginia | DC: Washington, DC
📞 Call (844) 535-4822 | Schedule Online