How to Keep Crawl Space Warm in Winter

Winters can be harsh and unforgiving, particularly for your crawl space. Whether you have an unfinished or finished basement under your home, without proper insulation, these areas can become freezing cold in no time! Keeping your crawl space warm during the cold winter months requires some planning and forward-thinking – but not necessarily a massive investment in costly retrofits.

How to Keep Crawl Space Warm in Winter

In this blog post, we’ll discuss how to keep crawl space warm in winter so that it will stay insulated, dry, and usable all throughout the season – no matter how hard the weather outside may be raging. So if you’re wondering how best to ensure that both you and your home survive a chilly winter unscathed – read on!

Can You Put a Heater in a Crawl Space?

Yes, you can put a heater in your crawl space. However, there are certain factors to consider before doing so. First and foremost, safety is of utmost importance when installing a heating system in a confined area like a crawl space. Make sure that all electrical wiring is up to code and properly insulated before attempting to install the heater.

It’s also important to make sure that the heater is sized appropriately for the space and that it is properly vented so as not to put your family at risk of carbon monoxide poisoning. In addition, you should ensure that all combustible materials are kept away from the heating system in order to prevent a fire hazard.

Once these safety measures are taken, you can install the heater in your crawl space. Be sure to place it so as not to obstruct access or cause any other safety hazards. You may also want to consider buying an energy-efficient model that will help reduce your heating costs while keeping your crawl space warm and comfortable throughout the winter.

If you are still uncertain or uncomfortable with the idea of installing a heater in your crawl space, you can always hire a professional HVAC technician to do the job for you. This solution may be more expensive, but it will ensure that the installation is done properly and safely.

No matter which route you take, taking steps to keep your crawl space warm in winter will go a long way toward protecting your home and maintaining a comfortable living environment.

10 Methods on How to Keep Crawl Space Warm in Winter

1. Crawl Space Insulation

One of the best ways to keep your crawl space warm in winter is to insulate it. You can do this by installing insulation on the floor and walls of your crawl space. This will help keep the area below your home warmer, which can help reduce energy bills by lowering the amount of heat that escapes through the floor. If you are considering installing insulation, make sure to consult with a professional for the best advice on what types of insulation to use. Although it may cost more upfront, it will be worth the investment in the long run.

Installing Insulation on the Floor and Walls

2. Crawl Space Encapsulation

Another way to keep your crawl space warm in winter is to encapsulate it. This involves sealing the crawl space with a vapor barrier so that moisture and air cannot enter. This will help keep the temperature more consistent in your crawl space and can also protect against mold growth. It’s important to make sure you use the right materials for this project, as some may not be suitable for the environment.

You’ll also want to make sure the vapor barrier is completely sealed around the perimeter of your crawl space. You may want to hire a professional to ensure it’s done correctly and safely. After the encapsulation is complete, you can install insulation in the walls and floor of your crawl space to help keep it even warmer. This will also protect against any moisture that may still seep into the space.

3. Crawl Space Heater

Another way to keep your crawl space warm in winter is to install a crawl space heater. These types of heaters are specifically designed for small and enclosed areas like crawl spaces. They usually use a forced-air system that is powered by propane or natural gas and is equipped with a thermostat that can be programmed to turn the heater on at certain temperatures.

The good thing about these types of heaters is that they are relatively easy to install and maintain and can provide a good amount of warmth to the area. However, it’s important to keep in mind that these types of heaters can be dangerous if not installed and maintained properly. It’s important to consult with a professional before installing and using a crawl space heater to make sure it’s done safely.

4. Crawl Space Ventilation

One way to keep your crawl space warm in winter is to ensure that it is properly ventilated. This means that there should be vents installed on the walls or floor of the crawl space so that air can circulate. This will help keep the temperature in the crawl space more consistent.

Ensure That It is Properly Ventilated

It is also important to make sure that there are no obstructions blocking the vents, such as debris or excessive insulation. Additionally, it is important to check that the vents are not blocked by snow or ice, which can prevent air circulation. Finally, make sure that the vents are not blocked by nearby bushes or trees, which can also block airflow.

5. Crawl Space Dehumidifier

Another way to keep your crawl space warm in winter is to install a dehumidifier. A dehumidifier can help maintain the humidity level in your crawl space, making it a less hospitable home for pests and mold. Additionally, the dehumidifier will also reduce moisture in the air, which can help to keep your crawl space warmer by trapping heat. Make sure you consult with a professional to determine the best dehumidifier for your space.

6. Insulate Pipes

If you have pipes running through your crawl space, be sure to insulate them. Insulating your pipes can help reduce energy loss and keep the warm air in. You can use pipe insulation or foam wrap to insulate your pipes. This will also help protect them from freezing during colder months. Although these materials can be purchased at most hardware stores, it’s a good idea to get them professionally installed for the best results. However, if you do it yourself, be sure to wear protective clothing and work carefully.

7. Seal Cracks and Gaps

Be sure to seal any cracks or gaps in your crawl space so that heat cannot escape. You can do this by caulking or weatherstripping around doors and windows, as well as around any openings in the walls or floors. Additionally, you can add foam insulation to any wall or floor cavities in order to further prevent the loss of heat.

Rigid Polystyrene Foam Board Insulation

Make sure to use high-quality materials to ensure a strong seal. You can also consider insulating the walls of your crawl space with rigid polystyrene foam board insulation, as it can help to keep the space warm and prevent any potential heat loss. Finally, consider wrapping pipes in insulation to reduce their heat loss and maintain the temperature in the crawl space.

8. Add a Rug

One simple way to keep your crawl space warm in winter is to add a rug or mat inside the door leading into the space. This will help trap heat and keep it from escaping. A thick rug with a rubber backing can be very effective in keeping the warm air from escaping. Make sure to secure the rug or mat so it does not slide around when walked on. This is especially important in areas that get a lot of foot traffic.

9. Add a Radiant Barrier

Another way to keep your crawl space warm in winter is to add a radiant barrier. This is a thin material that is installed on the walls or ceiling of the crawlspace, and it helps to reflect heat back into the room instead of allowing it to escape outside.

Add a Radiant Barrier

10. Install a Heated Subfloor

Finally, you can install a heated subfloor in your crawl space as another way to keep it warm in winter. This will provide an extra layer of insulation between the cold ground and your living space above, helping to regulate temperatures and prevent drafts from entering through cracks in the floorboards. 

It’s especially recommended for those who live in cold climates, as it can be a great way to maintain the temperature in your home. Installing a heated subfloor will require some professional help, as it can be a bit of a complicated process.


Although most people never think about their crawl space, it’s important to make sure that it is insulated and warm in the winter. By following these simple tips on how to keep crawl space warm in winter, you can ensure that your crawl space will be cozy all season long. 

So don’t neglect your crawl space this winter – take some time to insulate and heat it so that you can enjoy a warm home all season!

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