2026-04-13 7 min read
If you've lived in Covina for more than one summer, you already know what the heat feels like. Temperatures regularly push into the upper 80s and low 90s, and on the hottest days they can flirt with 99°F. That kind of sustained heat isn't just uncomfortable for you — it's quietly doing real damage to your garage door, one brutal afternoon at a time.
Covina sits in the San Gabriel Valley with a classic Southern California Mediterranean climate: hot, arid summers and mild winters. That means your garage door absorbs intense direct sunlight for months on end, often without relief from coastal breezes that cool down places closer to the ocean. If your door faces south or west — common on homes in Charter Oak, Covina Hills, or along the older residential tracts near downtown — you're dealing with peak afternoon sun beating directly onto the panels every single day.
Here's what that heat actually does to your system.
Steel doors expand when heated and contract overnight when temperatures drop back into the mid-60s. In Covina, that daily swing can be 25–30 degrees or more. Over time, this repeated expansion and contraction fatigues the metal, leading to warping, bowing panels, and gaps along the edges where the door no longer sits flush. Wood doors are even more vulnerable — the dry summer air pulls moisture out of the wood, causing cracking and splitting that gets worse every year.
Fading is the most visible sign. UV exposure bleaches paint finishes, especially on darker-colored doors. A door that looked sharp five years ago can look chalky and worn by the time you're ready to sell. If you're noticing this, take a look at our garage door buying guide for Covina homeowners before deciding whether to repaint or replace.
This one surprises most homeowners. Your garage door springs — both torsion and extension types — are made of tempered steel that's sensitive to temperature. In intense heat, the metal becomes slightly more pliable, which changes the tension calibration. More critically, the lubrication inside the coils dries out much faster in hot, dry conditions. Once the lube is gone, you get metal-on-metal friction that accelerates wear dramatically.
The result? Springs that should last 10,000 cycles might fail at 6,000 or 7,000 in Covina's climate. If your door feels heavier to lift manually, makes a grinding noise when opening, or suddenly slams down faster than usual, a heat-stressed spring could be the culprit. Our garage door spring replacement guide covers what to look for in detail — but the short version is: don't wait until it snaps.
Garage door openers are typically installed in the garage ceiling, which becomes one of the hottest spots in the house during summer. Garages in Covina's older ranch-style homes — many built between the 1940s and 1980s — often lack proper ventilation, trapping heat well above 100°F near the ceiling on hot days.
Most opener motors have a thermal overload protection feature that automatically shuts the unit down when it overheats. If your opener suddenly stops working on a hot afternoon and then works fine a few hours later, that's almost certainly the cause. Running through this cycle repeatedly shortens the motor's lifespan. A smart opener with a heat-tolerant motor — or simply improving garage ventilation — can make a real difference. Explore your opener options on our services page if you're due for an upgrade.
The rubber weatherstripping around your garage door takes a beating from UV rays and heat. In Covina's climate, vinyl and rubber seals can become brittle and crack within just a few years, especially on doors that face direct western exposure. Once the bottom seal cracks, you lose your defense against dust, insects, and hot air infiltration. That matters for your home's cooling costs — a failed bottom seal on an attached garage is essentially a gap in your home's thermal envelope.
Check your seals every spring before the heat arrives. If you can see daylight around the bottom corners or the rubber crumbles when you press it, it's time to replace them.
Lubricate twice a year. In Covina's dry heat, once a year isn't enough. Use a silicone-based or lithium-based spray on the springs, hinges, rollers, and tracks every spring and fall. Avoid WD-40 — it evaporates quickly and leaves residue.
Park strategically. If you can leave your garage door in the shade during peak afternoon hours (2–5 PM), you reduce panel stress significantly. Even a patio cover or pergola can extend the life of your door's finish.
Upgrade to an insulated door. A single-layer steel door acts like a frying pan in Covina summers. An insulated door with a quality polyurethane core dramatically reduces heat transfer into the garage, which protects everything inside — including your opener, stored items, and the wall connecting to your living space.
Watch for the warning signs early. The 10 signs your garage door needs repair become more relevant in summer — slow response times, unusual noises, and visible panel gaps all get worse in the heat.
If you're noticing any of these issues and aren't sure what's causing them, Garage Door Covina can take a look. A short inspection now is a lot cheaper than an emergency call in July. Reach out to schedule a visit before the hottest months arrive.
Q: Can heat actually cause my garage door spring to break? A: Yes. Extreme heat dries out the lubrication in spring coils and stresses the metal over time, which can lead to premature failure. Springs in hot climates often don't last as long as their rated cycle count suggests. Keeping them well-lubricated and having them inspected annually helps.
Q: My garage door opener stops working on really hot days. Is it broken? A: Probably not broken — most openers have a thermal shutoff that kicks in when the motor overheats. If it cools down and works again, that's the cause. However, if this is happening frequently, it's a sign the motor is under stress and may fail sooner than expected. Better ventilation or an opener upgrade can solve it.
Q: How often should I lubricate my garage door in Covina's climate? A: At minimum, twice a year — once before summer and once before winter. In Covina's dry heat, the lubricant in springs and rollers evaporates faster than in cooler, more humid climates. Use a silicone-based spray and avoid petroleum-based products that can attract dust and gum up the tracks.