An entrance is only good if the contractor is experienced who installed it. Make sure that you are dealing with a contractor who understands the requirements of door installations. Installers who buy products from home centers or big-box retailers and just "make it fit" to be avoided at all costs.
Similarly, a contractor records check on the website of your local Better Business Bureau to get their grade. An independent source of information is priceless because it will save quite a bit of heartache. Check also that the contractor has been in business for over 15 years. You can search for doors & windows installation services in Oshawa from various online sources.
The door itself, it should be noted that the door to high-quality steel and fiberglass replacement is usually filled with the same insulation material in their interior cavity. This insulation, called polyurethane foam, increasing the R-value.
The higher the R-value, the better equipped the door is to keep the temperature that is out of place on the outside. In addition, the door has a thermal-break quality which helps to maintain the cold temperature in contact exterior doors of the interior surface infiltration.
Once you compare the R-value to find the most efficient door for your home, your attention should turn to the perimeter of the door. After all, even the most isolated door is worthless if it is not custom-made with the exact dimensions of your door frame.
Aside from the draft coming in through the side and top of the entrance of a substitute, the problem with cheaper, low-quality doors often come from the preparation under the door.