Automatic Heat‑Activated Greenhouse Window Opener | No Power Required

🌡️ Auto Venting By Heat, Zero Electricity, Zero Wiring

No batteries, no solar panels, no external power needed. Built‑in wax‑filled hydraulic cylinder expands under rising temperature to open your greenhouse vent, and contracts to close window as temperature drops. It works fully automatically to stabilize interior temperature, prevent plant overheating and sun scald. Perfect for when you are away from home, at work or on vacation.

💪 Upgraded Heavy‑Duty Construction (Why We Cost More Than Budget Versions)

Many low‑cost competitors use thin stamped steel brackets and thin‑wall cylinders that bend, leak or fail within one growing season. Our version adopts：

1. Thickened hydraulic cylinder：Improved wax filling process, stable expansion & contraction, less prone to oil leakage after long‑term outdoor exposure
2. Reinforced solid aluminum‑alloy bracket + stainless‑steel pivot pin Light‑weight but high strength. Aluminium alloy resists rust naturally；stainless‑steel hinge pin prevents seizure & squeaking even after years of rain and UV exposure. No rust jam on rotating joints.
3. Precision‑fit connection structure：Reduce friction & squeaking noise after thousands of open‑close cycles

👉 This is exactly why our price is higher than cheap 2‑pack options on market: we upgraded core wearing‑parts to avoid frequent replacement. Buy once, use for multiple gardening seasons.

⚙️ Adjustable Trigger Temperature & Lifting Capacity

You can fine‑tune the trigger point for window opening. ‑ Trigger opening temperature：15‑25℃ (59‑77℉) ‑ Fully open：25‑35℃ (77‑95℉) ‑ Max lifting load：7kg / 15.4 lbs ‑ Max opening stroke：up to 45cm /17.7 inch

Notice: NOT for heavy glass windows. Do not exceed the max 7kg vent weight limit.

🛠️ Quick Installation, Fit Most Home‑Use Greenhouses

Comes with full set mounting screws. Install onto greenhouse frame in minutes. Compatible with most popular hobby greenhouses, cold frames, plant shelter vents. No complex modification required.

Specification