Can Your Product Survive This? High-Low Temperature Test from -20℃ to 70℃

Most video intercoms work fine in a showroom. But can they survive a freezing winter night, a scorching summer afternoon, and the rapid temperature swings in between? At FARHD, we don’t guess—we test. Our high-low temperature chamber pushes products from -20℃ to +70℃ to prove they can handle the real world.

Every product looks good on a specification sheet. But specifications don’t tell you what happens when the temperature drops to -20℃ at 3 AM in a Russian winter, or when the sun beats down on an outdoor station at 70℃ in a Middle Eastern summer. They don’t reveal whether the screen will still be readable, whether the touch interface will respond, or whether the battery will hold its charge.

That is why FARHD runs every product through a high-low temperature test in our in-house environmental chamber. It’s one of the most demanding steps in our quality assurance process—and one of the most important.

Why Temperature Testing Is Critical for Video Intercoms

A video intercom is not a smartphone. It doesn’t live in a climate-controlled pocket. It is mounted at the building entrance, exposed to the elements 24 hours a day, 365 days a year.

Consider what an outdoor station faces:

Winter nights – Temperatures can plunge well below freezing, especially in Russia, Northern Europe, and Canada.
Summer afternoons – Direct sunlight can push surface temperatures far beyond ambient air temperature, particularly in the Middle East and desert regions.
Day-night cycles – Rapid temperature swings cause thermal expansion and contraction, stressing materials, seals, and solder joints.
Humidity and condensation – Temperature changes can cause condensation inside sealed enclosures if the design is not robust.

A product that isn’t tested for these conditions may work perfectly on day one—and fail on day one hundred.

The FARHD High-Low Temperature Test: -20℃ to +70℃

Our high-low temperature test is conducted in a programmable environmental chamber that precisely controls temperature over time. Products are powered on and operating throughout the test, so we observe real-world performance—not just passive survival.

Test parameters:

Parameter	Specification
Low temperature	-20℃
High temperature	+70℃
Cycles	Multiple transitions between extremes
Dwell time	Sustained exposure at each extreme
Power state	Powered on and fully operational
Monitoring	Continuous, with periodic functional checks

Note: The -20℃ limit applies specifically to our battery-powered wireless products, where lithium-ion chemistry sets a practical floor. For our wired video intercom systems, we test to an even more demanding -40℃—you can read about that test here.

What We Check During the Test

Temperature testing is not just about whether a product turns on. We verify that every critical function continues to perform.

Display and Touch

No black screen – The display remains powered and visible at both extremes.
No flickering – Backlight stability is maintained.
No distortion – Colours remain accurate; no warping or lag.
Touch response – Capacitive touch continues to register input correctly.

Camera and Night Vision

Image clarity – Video remains sharp with no ghosting or noise.
Night vision activation – IR LEDs and the IR cut filter switch correctly.
Lens clarity – No fogging or condensation inside the lens assembly.

Audio

Microphone sensitivity – Voice pickup remains clear.
Speaker output – Volume and clarity are maintained.
Two-way audio – Full-duplex conversation works without echo or dropout.

Power and Battery

Charging behaviour – Batteries charge safely within temperature limits.
Runtime – Battery capacity holds up at low temperatures.
Thermal protection – Charging stops automatically if the battery exceeds safe temperatures.

Wireless and Connectivity

RF performance – Wireless range and stability remain within specification.
Wi-Fi connection – The device reconnects reliably after temperature cycling.
Signal integrity – No packet loss or disconnections.

Physical Integrity

No cracking – Housings and glass lenses remain intact.
No delamination – Screen bonding holds.
No seal failure – IP65 weatherproofing is preserved.
No condensation – Internal electronics stay dry.

Why -20℃ for Wireless Products?

If you are wondering why our battery-powered products are tested to -20℃ rather than -40℃, the answer lies in battery chemistry.

Lithium-ion batteries—the same technology used in smartphones and electric vehicles—experience reduced capacity and slower charging at low temperatures. Below -20℃, many cells become unreliable, and charging can become unsafe without sophisticated heating systems. Rather than overstate our specifications, we test our wireless products to the limits of their realistic operating range, and we build in thermal protection to ensure safe behaviour at the edges.

For wired products, which draw power from mains electricity and don’t rely on battery chemistry, we push the limit to -40℃.

This honest approach to specification is part of what sets FARHD apart. We don’t claim performance we can’t prove.

What the Test Proves

After completing the full high-low temperature cycle, FARHD products demonstrate:

Condition	Result
-20℃	Powers on, display readable, touch responsive, camera and audio functional
+70℃	No black screen, no flickering, stable performance
Rapid transitions	No cracking, no condensation, no seal failure
Post-test function	All features work normally after returning to room temperature

This means that whether your project is in Moscow, Helsinki, Toronto, Dubai, or Riyadh, FARHD products are engineered to perform.

Where This Matters Most

Temperature reliability is not a theoretical concern. It directly affects project outcomes in specific regions and applications.

Region / Application	Challenge	FARHD Advantage
Russia & CIS	Prolonged sub-zero winters	Wired systems tested to -40℃; wireless to -20℃
Northern Europe	Cold, humid winters	Sealed housings prevent condensation
Middle East	Extreme summer heat, direct sun	Stable operation at +70℃
Canada	Freezing winters, hot summers	Full-cycle reliability
Desert regions	Rapid day-night temperature swings	No cracking or distortion after cycling
Coastal areas	Salt air plus temperature variation	Corrosion-resistant materials and sealed construction

For distributors and integrators, specifying a product that has been temperature-tested means fewer warranty claims and happier customers. For developers, it means a system that won’t generate maintenance calls in the first year.

The FARHD Quality Assurance Philosophy

The high-low temperature test is one part of a broader quality system that includes:

Functional testing – display, touch, camera, audio, calling, and unlocking
Aging room testing – 12+ hours of continuous operation under elevated temperature and humidity
Waterproof testing – IP65 verification on every outdoor station
Temperature cycling – as described in this article

Every FARHD product carries CE, FCC, RoHS, IP65, and EMC certifications, and our factory has completed over 10,000 large-scale projects across more than 90 countries.

We test because we know that the field is where it matters. A product that passes our chamber is a product you can trust in yours.