The French door is just a double door. So the question facing the French door home owner is how fancy a security fix is wanted or needed. The important issue here is to make sure the door frame is strong enough to sustain the pressure of someone trying to kick the door in or to use their shoulder to shove in the door. The internet is full of examples of people kicking or shoving with their shoulder on single doors and gaining entry with little or no apparent effort.
Most security French door companies provide a steel frame for installation of their doors. Their installation instructions are easy to follow with minimal amount of tools required, yet their security is high enough to be adequate for the home owners need. Some of the features to look for are the hinges, locks, openers, safety glass, and styles of the door.
On higher end doors, locks will include two-way bank vault locks, sliding bolt locks, or keyed and keyless locks. The closer will usually be a heavy duty brass handle with the option for an upgrade usually to nickel, but other metals are offered. Hinges will be concealable and / or tamper-proof, some will be piano hinges which offer smoother and more secure opening, with greater resistance to pressures to break them. Yet, some manufacturers will offer several hinges in the place of the larger piano hinge. The result being the same, smoother opening and greater security against the door being caught by the wind and pulled out of its frame.
French doors will also have options for ventilation. Tempered safety glass with options for moveable panels to allow for air flow. If the Security French door fits over an existing door, the added benefit of insulation for the home is evident with the possibility of decreasing utility bills to a significant amount.
Other options to securing the French door is to install a bar across the door from the inside. This would provide for greater integrity of the entire door system by transferring the pressure of a home invaders kicking to the wall where the bar supports are attached.
The appearance of these devices are attractive. The metal holders come in various colors which match or contrast with the wall. The reinforcing bar is also colored to blend in with the existing decor. Curtains can be used to cover the appliance if the home owner wishes to distract from the appearance of the bar holders. But curtains will add to the insulation value by cutting down on sunlight coming into the home. Some of the tempered glass have UV reduction factors which will reduce the negative effects of sunlight on furniture.
Increasing the security of French doors will increase property value as French doors are generally seen as being one of the weakest areas of the home to protect from home invaders. In addition to the exceptional eye appeal of decorative French doors, being able to describe them as security doors will add to the property value.