New exterior doors often fit and insulate better than older types. If you have older doors in your home, replacing them could be a good investment, resulting in lower heating and cooling costs. If you're building a new home, you should consider buying the most energy-efficient doors possible.
Steel doors offer a number of benefits when used as exterior entry doors. They are resistant to shrinking, warping, sagging and rotting. Steel doors can provide up to 10 times more protection against home intrusion than a wood door. Steel is also fireproof and offers protection against the spread of fire. Doors constructed of steel are energy-efficient, up to four times as much as doors made of wood.
Fiberglass doors require the least maintainence. They resist scratches and dents, and will not rot, deteriorate or rust. Fiberglass doors will also not warp, bow or twist. They can be painted or stained and are available in wood-grain designs. Fiberglass doors are energy-efficient, providing five times the insulation value of wood doors.