Why Your Door Lock Sticks Every El Paso Summer

Every July and August we get the same call from Kern Place, from the Northeast, from Horizon City. The key goes in fine. It turns most of the way. Then it stops, and the door will not open unless somebody puts a shoulder into it.

Almost every time, the lock is not broken. The door moved.

Heat moves the door, not the lock

An exterior door in El Paso can see 100F on the outside face and air conditioning on the inside face at the same time. That difference makes the slab expand unevenly and the frame shift with it. The latch bolt that lined up with the strike plate in February is now sitting a couple of millimeters high.

A couple of millimeters is all it takes. The bolt catches the edge of the strike instead of dropping into it, and you feel that as a lock that will not turn.

That one test decides everything that follows, and it separates a minor adjustment from actual hardware work.

The second El Paso problem: dust in the cylinder

Spring dust storms push a fine grit into everything, and exterior cylinders take the worst of it. Grit alone will not stop a lock. Grit plus the wrong lubricant will.

What to try before calling anyone

1. 1

   Test with the door open

   Throw the bolt with the door open. Smooth means alignment. Rough means the cylinder or latch.

2. 2

   Look at the strike plate

   Check for a bright scrape mark on the metal. That mark shows you exactly where the bolt is hitting, and which way it needs to move.

3. 3

   Try the door at dawn

   If it works at 6am and sticks at 4pm, that is thermal movement confirmed. No further diagnosis needed.

4. 4

   Use the right lubricant

   Dry graphite or PTFE, one short application. If it improves for a day and returns, the cylinder is worn rather than dirty.

Most people can do all four in about five minutes. If the door passes the open-door test and the strike plate has a scrape mark, you are looking at an adjustment, not a new lock.

When it is actually the lock

Heat gets blamed for a lot of failures it did not cause. Treat these as real hardware problems rather than seasonal ones:

• The key turns fully but the bolt does not move. The cam or tailpiece is likely broken.
• The key sticks going in, in any weather, at any hour.
• The cylinder turns freely with no resistance and nothing happens.
• The bolt is rough with the door open, which rules alignment out entirely.

The part worth planning for

Doors that stick every single summer are usually telling you the strike was marginal to begin with. A door installed in a mild month can sit right at the edge of alignment and only fail once the heat pushes it over. Getting the strike plate set correctly once tends to end the annual problem, which is why we would rather adjust it properly than come back next August.

If the door is fighting you today, we cover the whole county and we will tell you on the phone whether it sounds like alignment or hardware.