If you are in the market of door-replacement (or addition for that matter), here is an article by Angie's List to aid the process.

Door to door

Doors are one of the few upgrades that will add a dramatic new look to both the interior and exterior of your home. Today’s doors are more energy efficient; carry better warranties and come in hundreds of styles. Whether it’s for looks or to increase energy savings, consider these tips when shopping for new doors.

Materials

• The front door is a great way to increase curb appeal, but don’t forget the back and interior doors.
• If your door is 15 years or older, chances are the weather stripping is worn out.
• Three options when it comes to exterior doors – fiberglass, wood and steel. All three can be painted, but only fiberglass and wood can be stained.
• New insulated fiberglass doors have very high U-values and are sealed much like a refrigerator door to dramatically reduce energy loss. More durable than wood and steel and require less maintenance.
• Durability is especially important for doors that aren’t shielded by a porch or overhang.
• Composite frames hold up better than wood and require less maintenance.
• Window installers tell us French doors have become more popular than sliding doors. This is due mostly to aesthetics, but French doors also offer more accessibility – you can open up both sides which makes moving furniture easier.

• Prices vary from $200 – several thousand depending on size, style and glass options. Steel is the cheapest, while fiberglass and wood are similar in pricing.
• Hardware also adds to the price and can range from $100 - $500.

• Choose a high-performance deadbolt lock that is durable and secure.
• According to the experts we spoke to, the door frame itself has historically been the weak link in terms of security. Ask about steel reinforced frames and plates behind the jams.
• Multi-point locks with rods that go into the header and sill and strike plate reinforcement can provide extra security.

• Every home is different, but, on average, you can reduce 80 percent to 90 percent of the energy loss by installing a new, energy efficient door.
• Virtually every door meets the minimum Energy Star requirements, but the amount of glass is the biggest determinant to how energy efficient the door is. It’s a trade off between energy efficiency and aesthetics. U-value for a door typically ranges from .15 (no glass) to .33 (full decorative glass).

• Most door installations can be done in one day or less.
• Hire a reputable installer. It’s critical that the door is hung and framed properly.
• Spring through summer and early fall is busy season for installers.