How to Prevent Frozen Pipes: A Homeowner’s Winter Guide (2026)
Key Takeaways
- Pipes freeze when water inside them drops below 32°F, most often in unheated spaces like attics, basements, garages, and exterior walls.
- Insulating exposed pipes, sealing drafts, and keeping your home at 55°F or higher are the core steps that prevent most freezes.
- During a hard freeze, let faucets drip slowly and open cabinet doors so warm air reaches the plumbing behind them.
- Know where your main water shut-off valve is — closing it fast can limit damage if a pipe does burst.
- Even a small pipe crack can release hundreds of gallons of water a day, so prevention is far cheaper than repair.
To prevent frozen pipes, keep water above freezing by insulating exposed pipes, sealing cold-air drafts near plumbing, holding your thermostat at 55°F or higher day and night, and letting faucets drip during a hard freeze. Pipes burst because water expands as it freezes, building pressure until the pipe fails — usually in unheated areas such as attics, crawl spaces, garages, and exterior walls. The three things that matter most: insulate the pipes most exposed to cold, keep warm air moving around them, and know where your main shut-off valve is so you can react fast. The steps below, drawn from guidance by the American Red Cross, walk through exactly how to protect your plumbing this winter, and how Empire Home Protect fits into the bigger picture of home-system protection.
Why Do Pipes Freeze and Burst?
Pipes freeze and burst because water expands by roughly 9% as it turns to ice, and that expansion builds pressure inside a closed pipe until the weakest point fails. The burst often is not at the ice itself but downstream, where trapped water has nowhere to go, which is why a frozen pipe can rupture far from the frozen section.
The pipes most at risk share one trait: they sit in spaces that are not heated to the rest of the home’s temperature. The highest-risk locations include:
- Exterior-wall plumbing with little or no insulation between the pipe and the cold.
- Unheated interior spaces — attics, basements, crawl spaces, and attached garages.
- Outdoor connections such as hose bibs, sprinkler lines, and pool supply lines.
- Pipes near drafts from cracked rim joists, vents, or gaps where cables enter the home.
How to Prevent Frozen Pipes: Step by Step
Preventing frozen pipes is a set of layered steps that keep pipe temperature above freezing: insulate, seal drafts, add heat where pipes are exposed, and keep water moving on the coldest nights. No single step is enough on its own during extreme cold, so combine them for the pipes most at risk.
- Insulate exposed pipes. Fit foam pipe sleeves or wrap on every accessible pipe in attics, basements, crawl spaces, and garages. Pay closest attention to pipes on exterior walls.
- Seal cold-air leaks. Use caulk or spray foam to close gaps where pipes pass through walls or floors, and where cables, dryer vents, or faucets let outside air in.
- Disconnect and drain outdoor hoses. Remove garden hoses, shut off interior valves to outdoor faucets, and drain the lines before the first hard freeze.
- Keep the heat steady. Set your thermostat to the same temperature day and night, no lower than 55°F, even when you are away.
- Open interior doors. Leave cabinet doors under sinks open so heated room air reaches the plumbing, and keep interior doors open to even out temperatures.
- Let faucets drip. During a hard freeze, let both hot and cold taps served by exposed pipes trickle. Moving water resists freezing and relieves pressure.
- Add heat where needed. For pipes that freeze repeatedly, use a UL-listed heat cable or keep a space heater (away from anything flammable) in the cold area.
If you are away for an extended stretch in winter, do not shut the heat off entirely. Our winter home maintenance checklist covers how to prepare a home before a trip.
What Temperature Should You Keep the House to Avoid Frozen Pipes?
The safe setting is 55°F or higher, held steady day and night, because that keeps interior air warm enough to protect pipes in walls and cabinets even during a cold snap. Dropping the thermostat overnight to save energy is a common mistake that lets vulnerable pipes cool to the danger zone.
Keep your home at a minimum of 55°F at all times during freezing weather, including when you travel. The U.S. Department of Energy notes that steady, moderate settings — rather than deep overnight setbacks — protect plumbing while still managing winter energy use (Energy.gov). The small amount you might save by turning the heat down at night is not worth the risk of a burst pipe. If you heat with a system you worry about failing mid-winter, see whether a home warranty covers your furnace.
Warning Signs and What to Do If a Pipe Freezes
A frozen pipe shows clear warning signs: little or no water from a faucet, frost on exposed pipe, or a strange smell from a drain. Acting quickly when you spot them can keep a frozen pipe from becoming a burst one, which is the difference between a minor thaw and major water damage.
Watch for these signs and responses:
| Warning sign | What it means | What to do |
|---|---|---|
| Only a trickle or no water | Ice is blocking the pipe | Open the faucet and begin thawing the pipe gently |
| Frost or ice on a visible pipe | That section is frozen | Apply gentle heat with a hair dryer or towels; never an open flame |
| Bulging or cracked pipe | The pipe has failed or is about to | Shut off the main water valve immediately and call a plumber |
| Water stains or dripping sounds | A pipe may have already burst | Close the main shut-off and document the damage |
To thaw a frozen pipe, keep the faucet open, apply gentle heat starting near the faucet and working toward the cold section, and continue until full pressure returns. If a pipe bursts, your first move is the main water shut-off valve — our guide to the main water shut-off valve shows how to find and use it.
How Much Does a Burst Pipe Cost to Repair?
A burst pipe costs far more than prevention: emergency plumbing repair commonly runs $1,000 to $4,000, and that is before water-damage restoration, which can reach five figures for flooring, drywall, and mold remediation. The Red Cross notes that even a small, one-eighth-inch pipe crack can release hundreds of gallons of water a day.
Prevention costs a few dollars of pipe insulation; a single burst pipe can cost thousands in repair and cleanup. A whole-home re-pipe after severe freeze damage is among the most expensive plumbing jobs a homeowner faces — see our whole-house repipe cost guide and slab leak repair costs for context. It is worth knowing the line most policies draw: homeowners insurance may help with sudden water damage from a burst, while a home warranty covers the plumbing system’s mechanical failures from normal wear. Neither covers damage traced to neglect, such as leaving the heat off, which is one more reason prevention matters.
Frequently Asked Questions
At what temperature do pipes freeze?
Water freezes at 32°F, but pipes in unheated or exposed areas are generally considered at risk once the outdoor temperature drops to about 20°F or below, especially with wind. Pipes in exterior walls or unheated spaces can reach freezing even when indoor air is warmer, which is why insulation and steady heat matter so much.
Should I leave faucets dripping to prevent frozen pipes?
Yes, during a hard freeze letting faucets served by exposed pipes drip slowly is one of the most effective steps. Moving water is far less likely to freeze, and an open faucet relieves the pressure that actually causes a pipe to burst. Drip both hot and cold lines, and focus on faucets farthest from where water enters the home.
How long does it take for pipes to freeze?
Exposed pipes can begin to freeze within six to eight hours once the surrounding temperature falls below about 20°F, though well-insulated or interior pipes take much longer. The exact time depends on pipe material, insulation, wind exposure, and how cold it gets, so do not wait for a specific hour mark to take precautions.
Does a home warranty cover frozen or burst pipes?
A home warranty covers the plumbing system’s failures from normal wear and tear, not damage caused by freezing or neglect. If a covered plumbing component fails mechanically, your plan helps with the repair; damage from a pipe that froze because the heat was off is generally excluded. Review your contract, and keep the heat on to stay protected.
What is the first thing to do when a pipe bursts?
Shut off your main water valve immediately to stop the flow, then open faucets to drain the remaining water and reduce pressure. Turn off electricity in affected areas if water is near outlets or panels, document the damage with photos, and call a licensed plumber. Knowing your shut-off valve location before an emergency saves critical minutes.
Protect Your Plumbing System Year-Round
Freeze prevention guards against winter emergencies, but your plumbing can fail in any season from ordinary wear. A home warranty helps cover those mechanical breakdowns so a failed water line or component does not drain your savings. View our plans or get a free quote, and compare providers in our best home warranty companies rankings.
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