How Do You Prevent Pipes From Freezing in Winter?
Last updated October 23, 2026
The short answer
Insulate Exposed Pipes
Insulating pipes is a fundamental prevention method. Foam pipe sleeves or heat tape work well for water lines in unheated spaces like attics, garages, and crawl spaces. Pay special attention to areas where pipes enter the home from outside. Proper insulation helps maintain water temperature above freezing, even when the surrounding air gets very cold.
Check the condition of existing insulation each fall. Replace any that is cracked, damp, or missing. For pipes that are hard to reach, consider using spray foam insulation to seal gaps in walls or floors around them. This action reduces the cold air that can reach the pipes, adding an extra layer of protection against freezing.
Maintain Interior Heat
Keep your thermostat set to a consistent temperature, day and night, during cold spells. A common recommendation is to keep it at 55 degrees Fahrenheit or higher, even when you are away. This consistent warmth helps protect pipes inside walls and cabinets. Avoid setting the thermostat lower at night if a severe freeze is expected.
Open cabinet doors under sinks in kitchens and bathrooms. This simple step allows warm air from the room to circulate around the pipes. It is especially important for pipes on exterior walls. If you plan to be away, ask a neighbor to check that your heat remains on. Do not turn your furnace off completely.
Drain Outdoor Water Sources
Outdoor faucets and supply lines are extremely vulnerable. Any water left inside can freeze, expand, and cause a break. This break can then lead to water leaking back into your home when the valve is turned on again. Taking these steps before the first hard freeze is a key part of winter preparation.
If you have an irrigation system, a professional blow-out may be necessary. For simple outdoor faucets, after draining, consider installing insulated covers. These foam domes snap over the faucet to provide a barrier against cold air. Remember, a small amount of water trapped in a bent hose can also cause pressure to build up in your indoor pipes.
- Disconnect, drain, and store all garden hoses.
- Close the indoor shutoff valves that supply outdoor hose bibs.
- Open the outdoor faucets to drain any remaining water.
- If your outdoor faucets are not frost-proof, install insulated covers.
- Drain your sprinkler system according to the manufacturer's instructions.
- Drain and winterize swimming pool supply lines.
Let Faucets Drip Strategically
Allowing a small, steady drip from faucets served by exposed pipes can prevent freezing. Moving water is much harder to freeze than stagnant water. This drip relieves pressure that builds up in the pipes between an ice blockage and the closed faucet. It is this pressure buildup that often causes pipes to burst.
Focus on faucets that are farthest from where water enters your home. A cold trickle from both the hot and cold lines is often recommended during the coldest nights. While this uses a small amount of water, it can be far less costly than repairing the damage from a burst pipe. This is a temporary measure for periods of extreme cold.
Prepare for a Potential Burst Pipe
Despite your best efforts, a pipe can still freeze and burst. Locate your home's main water shutoff valve now and ensure everyone in the household knows where it is. If you discover a burst pipe, turning off this valve immediately is the first and most important step to minimize flooding and water damage.
After shutting off the water, you can call a plumber for repairs. If water has already spread, contacting local water damage pros for emergency water extraction can help save your property. They have equipment to remove water quickly and start the drying process to prevent secondary damage like mold and structural issues.
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Call Now (520) 286-8912Frequently asked questions
What temperature should I keep my house to prevent frozen pipes?
It is generally advised to keep your thermostat at 55 degrees Fahrenheit or higher during cold weather, even when you are not home. This temperature helps maintain enough warmth inside walls and crawl spaces where pipes are located. Consistency is key, so avoid significant temperature drops overnight.
What should I do if a pipe freezes but hasn't burst?
If you suspect a frozen pipe, keep the faucet open. Gently apply heat to the frozen section using a hair dryer, heating pad, or towels soaked in warm water. Never use an open flame. If you cannot thaw it, or if the pipe is inaccessible, call a plumber immediately.
Can a small drip really prevent a pipe from bursting?
Yes, a steady drip can be very effective. It relieves the pressure that builds up inside the pipe if ice forms. This pressure relief is what prevents the pipe from rupturing. The strategy is most useful for pipes in exterior walls or unheated spaces during brief, severe cold snaps.