Short answer: Sun and heat are hard on a garage door. Finishes fade, the bottom seal and weatherstripping dry out and crack, lubricant dries faster, and dust builds up in the tracks. Keep the finish clean, check the seals each season, lubricate a little more often, and shade the safety sensors if direct sun confuses them. Leave springs and cables to a professional.
In a hot, sunny place the garage door takes a beating that is easy to overlook. It faces the street, it sits in full sun for hours, and the garage behind it can get very hot by the afternoon. None of that breaks a door overnight. It just wears things down faster, and small problems show up sooner than they would somewhere milder.
The good news is that most heat and sun care is simple. It is mostly cleaning, looking and lubricating on a regular rhythm. Here is what to watch for and what to do about it.
Wash the outside of the door a few times a year with mild soap and water and a soft cloth or sponge. Rinse it well. Skip harsh cleaners and pressure washers, which can strip the finish or force water where it shouldn't go.
While you clean, look for peeling, cracking or bare spots. On a steel door, a scratch that reaches bare metal can start to rust, so touch it up with paint the door maker recommends. On a wood door, sun and dry air can pull moisture out of the wood and lead to cracks or warping. Wood doors need their paint or stain kept up, usually more often in strong sun. Check your door maker's care guide for the right products.
Close the door and look along the bottom from inside the garage. If you see daylight, or the seal feels stiff and flat instead of soft, it is probably time for a new one. Do the same along the sides and top. A seal that has shrunk away from the frame lets in dust and heat and makes the garage harder to keep cool.
Bottom seals and weatherstripping are wear parts. Replacing them is normal upkeep, not a sign that anything is wrong with the door.
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Heat and dry air shorten the life of lubricant. In a hot climate it makes sense to lubricate a little more often than the usual few times a year. Use a lubricant made for garage doors on the hinges, the roller bearings and the springs, and follow your opener manual for the chain or screw. A light coat is enough. Wipe off the extra so it doesn't collect dust.
Don't grease the tracks. Wipe them clean with a dry cloth instead. Grease in the tracks grabs dust and turns into grit. If your door has already started squeaking or grinding, our guide to common garage door noises explains what each sound usually points to.
The photo eye sensors near the bottom of the tracks send a beam across the opening. In some garages, low afternoon sun shines straight into the receiving sensor and the opener reads it as a blocked beam. The door then refuses to close or reverses for no clear reason, often at about the same time each day.
If that sounds familiar, check your opener manual first. Some sensors can be swapped so the receiver sits on the shaded side, and simple sun shields are sold for this problem. Keep the lenses clean and the sensors pointed at each other. If the door still won't close, see why a garage door won't close for the other common causes. After any change, test that the door still stops and reverses when something breaks the beam.
The opener itself is built to handle a warm garage, but a few easy habits help. Keep the opener's vents clear of stored boxes. If your opener has a battery backup, test it once in a while and replace the battery when the manual says to. Swap remote batteries when the range starts to drop, and try not to leave spare remotes on a dashboard in direct sun.
If you plan to replace your door someday, an insulated door can help keep a garage cooler in the afternoon. That is a choice for down the road, not something you need to act on today.
Springs, lift cables and the bottom brackets where the cables attach are under high tension. They carry the weight of the door. Heat doesn't change that. Don't adjust, loosen or pry on any of them. If you see a gap in a spring, a frayed or rusty cable, or a door that hangs crooked, stop using it and have a professional look. Our list of spring warning signs covers what to watch for, and our garage door safety guide has more on keeping everyone clear of moving parts.
A yearly professional visit is where the heavy parts get checked. A good one looks at springs, cables, balance, the opener settings and the safety features. Here is what a tune-up actually checks.
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Heat and strong sun mostly wear on the finish, the seals and the lubricant. Finishes fade, rubber and vinyl dry out and crack, and moving parts dry out faster. Regular cleaning, seal checks and lubrication handle most of it.
In some garages, low sun shines into the safety sensor and the opener reads it as a blocked beam. Clean the lenses, check alignment and see your opener manual about shading or swapping the sensors.
A little more often than the usual few times a year, since heat dries lubricant out. Use a garage door lubricant on hinges, roller bearings and springs, and keep grease out of the tracks.
Often, yes, since it is a simple wear part. Follow the door maker's instructions. If the bottom brackets or cables are in the way, leave that part to a professional.