Exterior doors should not allow air infiltration. For energy efficiency, exterior doors should, at a minimum consist of solid wood. Better exterior doors are built of metal or fiberglass with insulated cores. All the doors of a house should swing without scraping the floor. Check all water distribution lines for exposure to freezing conditions.
Pipes can freeze if they are located in or too close to exterior walls.
Pipes in attics may also be susceptible to freezing. Check the water heater for type and capacity. Because an electric water heater has a longer recovery time, its size should be between 50 and 60 gallons. Necessary features on a water heater are a shut-off valve and a temperature and pressure relief valve. Check water flow from all fixtures in a house for pressure and leaks.