How to Keep Pipes From Freezing Without Heat: 9 Steps

Knowing how to keep pipes from freezing without heat can save you from a burst pipe and a flooded basement while you wait for a repair. Frozen pipes happen when water lines in cold spots drop below freezing and the water expands. Here are 9 safe steps to protect your plumbing during a heating outage in a Massachusetts winter, and what to do if a pipe freezes anyway.

Key Takeaways

• Moving water resists freezing. Drip faucets on outside walls.
• Let warm air reach the pipes. Open sink cabinets.
• Heat safely. No ovens, grills or open flames.
• If heat will be off a long time, shut off and drain the water.
• Thaw gently. Never use a torch.

1. Drip Faucets on Outside Walls

• Let cold and hot faucets drip slowly on sinks along exterior walls.
• A slow drip relieves pressure and keeps water moving.
• Start with the faucets farthest from where water enters the house.

2. Open Cabinet Doors

• Open kitchen and bathroom sink cabinets so room air reaches the pipes.
• Move cleaning products out of reach of kids and pets.

3. Keep Interior Doors Open to Pipes, Closed to Cold Rooms

• Keep doors open to rooms with plumbing so warm air can circulate.
• Close doors to rooms with no plumbing to hold warmth where it counts.
• Keep the garage door closed if water lines run through it.

Need your heat back fast? Request a no-heat repair visit and tell us if any pipes are at risk.

4. Use Space Heaters Safely

• Use UL-listed electric heaters with tip-over shutoff.
• Plug directly into a wall outlet, not an extension cord.
• Keep 3 feet of clearance from anything that can burn.
• Never leave them running unattended or while sleeping near bedding.
• Never use an oven, grill, camp stove or kerosene heater indoors for heat.

5. Protect the Coldest Spots

• Basements, crawlspaces, exterior walls and unheated porches freeze first.
• Wrap exposed pipes with foam pipe insulation.
• Seal drafts near pipes with weatherstripping or temporary insulation.
• Listed heat tape can protect vulnerable runs; follow the instructions exactly.

6. Shut Off and Drain if Heat Will Be Out Long

• Find the main water shutoff, usually where the line enters the basement.
• Turn it off, then open faucets on the lowest and highest floors to drain the lines.
• Flush toilets to empty tanks.
• Boilers and water heaters need special care. Ask a pro before draining a heating system.

7. Know the Signs of a Frozen Pipe

• A faucet that gives only a trickle or nothing at all.
• Frost on an exposed pipe.
• A bulge or crack in the pipe.

8. Thaw a Frozen Pipe Safely

• Open the faucet so water can flow as it melts.
• Warm the pipe gently with a hair dryer, heating pad or warm towels, starting near the faucet.
• Never use a torch or open flame.
• If you cannot reach the frozen section or a pipe has burst, shut off the main water and call a plumber.

9. Get the Heat Restored

The real fix is getting heat back. Start with the checklist in no heat in house. After a storm, see no heat after a power outage.

How Cold Is Too Cold?

Pipes in unheated spaces can freeze whenever temperatures stay below 32°F long enough. Pipes inside a house that is losing heat are at risk once the house itself gets cold. A common rule of thumb is to keep a vacant home at 55°F or higher in winter. Insulated, interior pipes hold out much longer than pipes on outside walls.

A heating system that fails less often is the best protection. Per DOE's guide to furnaces and boilers, new condensing systems reach 90% to 98.5% AFUE, and per DOE's maintenance checklist, a clean filter can lower energy use by 5% to 15%. As of 2026, a fall heating tune-up remains the simplest way to avoid a mid-winter outage.

Protect Your Pipes, Then Restore Your Heat

How to keep pipes from freezing without heat comes down to moving water, warm air at the pipes, safe heating and draining the system if needed. Then get the heating system fixed before the next cold night.

Jose has worked in HVAC since 2015. HomePros repairs furnaces, boilers and heat pumps across the North Shore with a written flat price before any repair. Schedule heating repair, or call (781) 426-8428.