Spray foam insulation can be applied at temperatures as low as 5 degrees Fahrenheit, but this can cause problems with the application and effectiveness of the insulation. It is important to maintain the foam at the temperatures required by the manufacturer and not to spray a substrate that is too cold. Open-cell aerosol foam should be used indoors, while closed-cell aerosol foam can be used indoors or outdoors. When applying the spray foam, an ambient air and substrate temperature of at least 40 degrees Fahrenheit is ideal.
It can take up to 24 hours for aerosol foam insulation to completely dry, and heated equipment may be used to ensure that the foam is applied at the correct temperature and cures properly regardless of the temperature and humidity of the climate. Band heaters are traditionally used to preserve foam temperatures at a low cost. The components must be kept in a specific temperature range, as should the surfaces to be sprayed. While cold weather isn't ideal for a successful application of spray foam, it is possible to apply it in cold climates with the right preparation.
