A build-up of ice inside a freezer reduces storage space and makes the compressor work harder, which can increase your energy bill over time. Defrosting periodically keeps it running efficiently.
How Do You Defrost a Freezer?
To defrost a freezer, switch it off and empty the contents, leave the door open with towels laid down to catch melting ice, and once fully defrosted, wipe the interior dry before switching it back on. Placing bowls of hot water inside speeds up the process considerably compared with waiting for ice to melt naturally at room temperature.
What You Will Need
- A cool bag or spare freezer space for food during defrosting
- Old towels
- A bowl for hot water, to speed up melting
- A plastic scraper, never metal, for stubborn ice
- A cloth for cleaning once defrosted
How to Defrost a Freezer: Step by Step
1. Plan Ahead for Your Food
Move frozen food to a cool bag with ice packs, or temporarily to a neighbour’s freezer, since defrosting can take several hours depending on how much ice has built up.
2. Switch Off and Unplug
Turn off and unplug the freezer before starting, both for safety and to allow the internal temperature to rise so the ice can melt.
3. Lay Down Towels
Place old towels around the base of the freezer and inside to absorb melting water as the ice breaks down.
4. Speed Up the Process With Hot Water
Placing a bowl of hot, not boiling, water inside the freezer and closing the door for ten to fifteen minutes at a time helps loosen ice considerably faster than leaving the door simply open to room air.
5. Remove Loosened Ice Carefully
Once ice has softened, use a plastic scraper to gently remove larger chunks. Never use a metal tool or knife, since this risks puncturing the cooling coils behind the ice.
6. Wipe Down the Interior
Once fully defrosted, wipe the interior with a cloth and a mild solution of warm water and baking soda, which also helps neutralise any odours.
7. Dry Thoroughly Before Switching Back On
Dry all interior surfaces fully before plugging the freezer back in and returning food, since residual moisture will simply refreeze and reduce the benefit of defrosting.
How Often Should You Defrost a Freezer?
Manual defrost freezers typically need defrosting every three to six months, or sooner if ice buildup exceeds around 5mm thick, since this is the point at which efficiency starts to noticeably decline. Frost-free models are designed to avoid this need entirely through automatic internal cycling.
If you are considering upgrading to a frost-free model, our fridge freezer buying guide covers what to look for.
Frequently Asked Questions
How long does it take to defrost a freezer?
Defrosting typically takes two to six hours depending on how much ice has built up, though using bowls of hot water can significantly speed up the process.
Can I use a hairdryer to defrost a freezer faster?
This is not recommended, since mixing electrical appliances with melting ice and water creates an electric shock risk. Hot water bowls are a much safer way to speed up defrosting.
Why does my freezer keep icing up quickly?
A poor door seal, frequent door opening, or leaving the door ajar are the most common causes of rapid ice buildup, since warm, moist air entering the freezer is what forms new ice.
Is it safe to use a knife to remove freezer ice?
No. A metal tool or knife risks puncturing the cooling coils behind the ice lining, which can cause expensive damage. Always use a plastic scraper instead.
Do frost-free freezers ever need defrosting?
Rarely, since they are designed with automatic internal cycles that prevent significant ice buildup, though an occasional check and wipe-down is still worthwhile.
Always unplug the freezer before defrosting, and never use metal tools to remove ice near the cooling coils.
About the Author
Spire Homes Editorial Team researches and writes practical, UK focused home improvement guides covering renovation planning, financing, interior design, and home appliances.
