Best Solar Fan for Greenhouse: 5 Fans Compared

The listing states a 12-inch solar exhaust fan with a smart thermostat that switches the fan on and off by ambient temperature, 720 CFM for spaces up to 1600 cubic ft, and two 30W bifacial panels generating up to 48W. It lists a 5000mAh battery for 6 hours after full charge, IP44 fan blades, a 14.8ft cable, metal build and 3 speeds. The spec table lists 680 CFM against the bullets' 720 CFM, so trust the bullets; no warranty term is stated.

Who it's for: greenhouse owners who want set-and-forget thermostat ventilation. Who should skip it: anyone who needs all-night runtime or a stated warranty.

Its Solar Score of 9.6/10 comes from performance 30/35, build 21/25, value 20/25, safety 6/10 and warranty 0/5: 77 of 100 points, placed on our 9.2 to 9.8 scale.

Figures as published on the retailer listing, collected 20 October 2026. Performance figures are manufacturer rated.

What this listing states. IP44 fan blades stated, so safety scores 6 of 10. No warranty term, so warranty scores zero. See How We Pick.

Fans and pumps. Keep fingers and cords away from moving blades and intakes, run pumps only submerged as the maker directs, and treat airflow and flow rates as the maker's figures.

This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.

The listing states quad solar fans with an 8800mAh battery for up to 10 hours after full charge, adjustable temperature control that switches power by sunlight conditions, and two 25W bifacial panels. It lists IP44 fan blades and plugs, cables of different lengths for flexible mounting on both sides of the space, and 339 CFM per fan for up to 2540 cubic ft. The title says 5.5-inch fans against 4-inch in the bullets, so trust the title; no warranty term is stated.

Who it's for: greenhouse owners who want distributed cross ventilation with a long battery. Who should skip it: anyone who needs high per-fan airflow.

Its Solar Score of 9.5/10 comes from performance 29/35, build 20/25, value 20/25, safety 6/10 and warranty 0/5: 75 of 100 points, placed on our 9.2 to 9.8 scale.

Figures as published on the retailer listing, collected 20 October 2026. Performance figures are manufacturer rated.

What this listing states. IP44 fan blades and plugs stated, so safety scores 6 of 10. No warranty term, so warranty scores zero. See How We Pick.

Fans and pumps. Keep fingers and cords away from moving blades and intakes, run pumps only submerged as the maker directs, and treat airflow and flow rates as the maker's figures.

This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.

The listing states an 18-inch portable fan with a pure copper brushless motor, ultra-thin metal blades and 3650 CFM maximum airflow at 1300 RPM with 32 dB operation. It lists a 35W monocrystalline panel charging in 4 to 6 hours, a 22800mAh battery with 8 to 12 hours at high speed and 30 to 60 hours at low, 360-degree tilt, and a USB-A 5V/1A socket for phones, flashlights and lamps. The spec table lists 1460 CFM against the bullets' 3650 CFM, so trust the bullets; no IP rating or warranty term is stated.

Who it's for: anyone who wants maximum portable airflow with long battery life. Who should skip it: anyone who needs a mounted exhaust fan.

Its Solar Score of 9.5/10 comes from performance 33/35, build 21/25, value 21/25, safety 0/10 and warranty 0/5: 75 of 100 points, placed on our 9.2 to 9.8 scale.

Figures as published on the retailer listing, collected 20 October 2026. Performance figures are manufacturer rated.

What this listing states. No weather rating or protection feature is stated, so safety scores zero. No warranty term, so warranty scores zero. See How We Pick.

Fans and pumps. Keep fingers and cords away from moving blades and intakes, run pumps only submerged as the maker directs, and treat airflow and flow rates as the maker's figures.

This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.

The listing states a 10-inch solar exhaust fan with up to 1020 CFM (790 CFM at the default level 8), dual 20W monocrystalline panels, and a 60Wh battery for 10+ hours at default speed. It lists 12 speed levels with timer controls, a remote working from 26 ft, a full-metal housing with a pure copper brushless motor and aluminum blades, and 40 to 60 dB operation. The spec table lists 50 dB against the bullets' 40 to 60 dB, so trust the bullets; no IP rating or warranty term is stated.

Who it's for: shed and greenhouse owners who want remote-controlled exhaust with a big battery. Who should skip it: anyone who needs a stated weather rating.

Its Solar Score of 9.5/10 comes from performance 32/35, build 21/25, value 21/25, safety 0/10 and warranty 0/5: 74 of 100 points, placed on our 9.2 to 9.8 scale.

Figures as published on the retailer listing, collected 20 October 2026. Performance figures are manufacturer rated.

What this listing states. No weather rating or protection feature is stated, so safety scores zero. No warranty term, so warranty scores zero. See How We Pick.

Fans and pumps. Keep fingers and cords away from moving blades and intakes, run pumps only submerged as the maker directs, and treat airflow and flow rates as the maker's figures.

This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.

The listing states a 2-pack of 7.1-inch solar fans with a pure copper brushless motor at 3800 RPM and 900 CFM per fan, for 150 to 230 sq ft of ventilation. It lists a 25W panel per fan with 16.5ft cords for flexible intake/exhaust placement, high speed on sunny days and 30% speed on cloudy days, and no battery. The bullets promise a 1-year free exchange service with 24-hour after-sales response.

Who it's for: greenhouse and coop owners who want a simple 2-pack for cross ventilation. Who should skip it: anyone who needs night runtime.

Its Solar Score of 9.5/10 comes from performance 32/35, build 20/25, value 21/25, safety 0/10 and warranty 0/5: 73 of 100 points, placed on our 9.2 to 9.8 scale.

Figures as published on the retailer listing, collected 20 October 2026. Performance figures are manufacturer rated.

What this listing states. No weather rating or protection feature is stated, so safety scores zero. No warranty term, so warranty scores zero. See How We Pick.

Fans and pumps. Keep fingers and cords away from moving blades and intakes, run pumps only submerged as the maker directs, and treat airflow and flow rates as the maker's figures.

This is general buying information, not professional advice. Follow each product manual and local rules, and see our Safety Disclaimer.