When water freezes it expands causing pipes to burst and possible flooding to occur. Domestic water lines, heating and cooling systems are all susceptible.
Before freezing weather occurs preventative maintenance to buildings and heating systems are crucial.
Seal/caulk windows, doors, electrical outlets, & ensure weather-stripping is in good condition
Insulate wall cavities
Insulate water pipes exposed to cold temperatures or drafts
Maintain heating equipment according to manufacturer recommendations
Inspect filters and piping for obstructions (dust, sludge, etc.)
Verify that dampers, vents and valves are in the proper positions, allowing for adequate air movement/water flow
Tips for when the weather is extremely cold.
Do not set thermostats lower than 13 degrees C (55 degrees F)
Open cabinet doors and run fans to allow warmer air to circulate around the plumbing (where piping is situated within enclosed vanities along exterior walls)
Consider monitored low temperature alarms in strategic locations to provide warning prior to freezing conditions. Know where all your shut off valves are located and keep tools and supplies required to shut valves readily available at all times. Portable heaters should only be used as a last resort and a temporary solution. Ensure extension cord use is limited and that the heaters have tip-over protection and a thermostat.