Highland Ridge thermal testing was done in a controlled environment and functions of the coach were fully operational at time of testing. Testing was done in a controlled environment therefore; temperatures during testing may not represent actual temperatures in nature and cannot account for elements such as wind or moisture. In actual use, unit may perform differently. To prevent freezing and damage, our RVs should be winterized if they will be exposed to temperatures that will fall at or below 32°F (0°C). Highland Ridge's limited warranty does not cover damage caused by freezing.