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Can I Leave My Home Unheated During the Winter?

Last updated October 31, 2026

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The short answer

Why Unheated Homes Are Risky

A home without heat in winter faces two main threats: frozen pipes and moisture buildup. When water freezes inside pipes, it expands and can cause them to crack or burst. That leads to water damage that affects walls, floors, and belongings.

Cold air holds less moisture, but when warm indoor air meets cold surfaces, condensation forms. This dampness can soak into drywall and wood, creating conditions where mold can grow. In a humid continental climate with cold snowy winters, these risks are real.

What Temperature to Keep

Most pros suggest keeping your thermostat at 55 degrees Fahrenheit or higher when you are away. This temperature is enough to keep pipes from freezing in most areas, even in a cold climate. It also helps maintain a stable indoor environment.

If you have rooms with poor insulation or exposed pipes, consider raising the temperature slightly. You might also open cabinet doors under sinks to let warm air reach the plumbing. This simple step can make a difference in older homes.

  • Set the thermostat to at least 55 degrees
  • Open cabinet doors to expose pipes to warm air
  • Seal drafts around windows and doors
  • Let faucets drip slowly during extreme cold
  • Keep garage doors closed if pipes run through
  • Consider a smart thermostat to monitor temperature

Draining Water Systems

If you plan to leave the home unheated for a long period, draining the water system may be a safer option. Turn off the main water valve, then open all faucets and flush toilets to remove water from pipes. Also drain the water heater and any irrigation lines.

Remember to pour antifreeze into traps and drains if you drain the system. This prevents water in those areas from freezing and cracking. If you are unsure about the process, a plumber can help you do it correctly.

Preventing Condensation and Mold

Even at 55 degrees, moisture can still build up. Use exhaust fans in bathrooms and kitchens, and keep interior doors open to allow air to circulate. You might also run a dehumidifier to pull excess moisture from the air.

If you notice musty odors or visible mold when you return, address it quickly. Mold can spread and cause health issues. A mold professional can assess the situation and recommend safe removal methods.

  • Use a dehumidifier in damp areas
  • Keep interior doors open for airflow
  • Run exhaust fans periodically
  • Wipe down condensation on windows
  • Check for leaks before leaving
  • Store items off the floor to avoid water contact

What to Do After a Cold Spell

When you return, check for frozen pipes before turning on the water. Look for visible frost or cracks. If a pipe is frozen, do not use a torch or open flame to thaw it; that can cause a fire. Use a hair dryer or warm towels instead.

If you suspect water damage from a burst pipe, contact local water damage pros. They can extract water, dry the structure, and help prevent mold growth. Acting quickly can reduce the extent of the damage.

  • Inspect pipes for cracks or frost
  • Thaw frozen pipes slowly with warm air
  • Turn off water if you see a leak
  • Call a plumber for pipe repairs
  • Contact water damage pros for drying and cleanup

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Frequently asked questions

What is the lowest safe temperature for an unoccupied home?

Most pros recommend keeping the thermostat at 55 degrees Fahrenheit or higher. This helps prevent pipes from freezing and reduces condensation. If you have poor insulation or exposed pipes, consider a higher setting.

Can I just turn off the water and leave the heat off?

You can, but you must drain all water from pipes, toilets, and appliances. Even small amounts of water can freeze and cause damage. Also, add antifreeze to traps. If you are unsure, have a plumber do it.

What should I do if I find frozen pipes when I return?

Turn off the main water valve immediately. Thaw the pipe slowly with a hair dryer or warm towels, never with a flame. Check for cracks. If you see damage, call a plumber and a water damage pro to dry the area.

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