With the sub freezing temperatures all your mechanical devices get put to the test. It is very important to make sure snow and ice don’t form around your condensate drains. Your furnace and your water heater both have a vent and condensate drain. If snow piles up in front of this or if your condensation freezes then it will prevent these units from working properly. Your home builder warranty does not cover adverses weather conditions and it is important to make sure these vents and drains are clear and do not freeze.