A freeze-proof faucet is a great outdoor plumbing fixture. Having a freeze-proof faucet will allow you to have water outside the house even in the winter. A freeze-proof faucet does well in cold temperatures because the main water line that supplies it is up to 12” away from the spigot inside the insulated wall or under the insulated house. When the spigot is turned off the water is stopped in the far end of the pipe where it is insulated so there is less chance of it freezing and bursting the pipe.
Like everything else a freeze-proof faucet will eventually wear out and will need to be rebuilt or replaced. Most likely a problem with the faucet will become apparent after the winter when you go to turn the faucet on and it leaks. The freeze-proof faucet can leak from several different areas. The source of the leak will determine the type of repair that is needed.
The freeze-proof faucet can leak from around the handle stem. If this is the source of the leak when you turn the handle to open the spigot water will tend to pool out from around the handle. This type of leak can usually be fixed by tightening the packing nut. To do this remove the screw that holds the handle in place and take the handle off. This will give you access to the packing nut. Tighten it, replace the handle, and test for a leak. If this does not work you can replace the packing with either new packing or a faucet rebuild kit which will have new packing.