Auto Vent Opener - 2 Pack

How does the Auto Vent Opener work?

It uses a temperature-activated hydraulic cylinder—no batteries or electricity needed.

At what temperature does it open?

Starts opening between 60–77°F (15–25°C), with a max lift of 18 inches.

What is the lift capacity?

Up to 15 lbs.

What makes it different from single-spring models?

It uses a dual-spring system for stronger force, better stability, and wind resistance.

What materials is it made from?

Aluminum alloy with stainless steel springs, powder-coated for weather resistance.

Is it universal?

Yes, it installs easily on most greenhouse roof windows.

How well do polycarbonate and hybrid greenhouses keep heat inside?

Performance depends on climate and setup, but in general:
Polycarbonate greenhouses hold heat better and usually stay about 5–10°F warmer than outside (with 8 mm PC panels).
Hybrid greenhouses (PC roof + glass sides) offer medium insulation, typically about 2–7°F warmer than outside.
PC panels trap heat more effectively, while glass allows more heat to escape.

What type of heater is best for my greenhouse?

The best type of greenhouse heater depends on your greenhouse size, local climate, power availability, and plants you’re growing. Here is a simple, general recommendation.

A. Small greenhouses (up to ~120 sq.ft)
Choose an electric greenhouse heater (with fan + thermostat).
B. Medium greenhouses (~120–250 sq.ft)
Use one larger electric heater, or in colder areas, two smaller electric heaters.
C. Large greenhouses (250+ sq.ft)
Use a propane / natural gas heater or 2–3 electric heaters spread around the space.

What heater features should I look for?

• Built-in thermostat (keeps a steady temperature)
• Overheat / tip-over protection
• Fan or circulation to move warm air
• For gas heaters: use in a ventilated area and follow safety instructions

How many BTUs do I need to heat my greenhouse? (Greenhouse Heating BTU Recommendation )

Climate Region
Suitable for both mild-cold and cold regions: use lower value for mild-cold, higher value for colder areas.

Temperature Increase Target
·In Moderately cold regions (USDA Zones 7–9),
The typical winter minimum temperature ranges from 0–30°F (-17.8 to -1.1°C). Greenhouse heating is generally designed to raise the indoor temperature by about 20°F (approximately 11°C).
·In Colder regions (USDA Zones 5–6),
The typical winter minimum temperature ranges from -20–0°F (-28.9 to -17.8°C). Greenhouse heating is generally designed to raise the indoor temperature by about 30°F (approximately 17°C).