SunCooler™ Residential Solar Attic Fan | Premium Off-Grid Roof Ventilation That Actually Works

The SunCooler™ isn’t another cheap direct-drive solar attic fan that dies in two summers. This is a professional-grade solar exhaust system from Northwest Renewable Energy: The same engineering DNA as the full SunCooler industrial line, just sized for attics, homes, garages, private shops, barns and sheds.

It doesn’t just ventilate your attic, it delivers powerful fully ff-grid whole-house airflow with four intelligent modes: exhaust, induction, nightflush, and destratification. SunCoolers are made with anodized aluminum, state-of-the-art solar panels, and industrial-grade motors and circuit board control systems engineered for harsh environments: the true “one-and-done” investment that will serve your home for decades.

• The SunCooler Solves Extreme Attic Heat that makes the whole house hotter and drives up cooling bills.
• The SunCooler Solves Overheated Homes during brownouts and power outages that come with heat waves.
• The SunCooler Solves Attic humidity and mold risk that damages insulation and roof structure.
• The SunCooler Improves HVAC Inefficiency caused by super-heated attic air.
• The SunCooler Solves stagnant indoor air and CO₂ caused byt underventilation, heat, and occupant generated CO2 and humidity.
• The SunCooler Improves Winter Heating Costs via Destratification, to bring down that risen heat at the ceiling.

SunCooler™ installed on a single story rooftop: clean, powerful, and completely off-grid.

SunCooler modes for full structural air handling and ventilation.

The SunCooler™ is far more than an attic fan. It is a complete, autonomous solar air-handling system with four intelligent modes that work together to protect your attic, cool your home, improve indoor air quality, and cut energy costs all while running completely off-grid.

Exhaust Mode: Powerful Attic Heat & Humidity Removal

In Exhaust Mode the SunCooler rapidly pulls super-heated air out of your attic through the roof while creating strong negative pressure that draws cooler air into the living space below.

• Solves extreme attic heat that radiates down into your home and drives up cooling bills
• Prevents attic humidity and mold by removing trapped moisture before it damages insulation or roof structure
• Helps your existing HVAC work more efficiently by keeping the attic dramatically cooler

Exhaust Mode powerfully removes hot attic air and humidity.

Nightflush Mode: Free Overnight Pre-Cooling

At night the SunCooler switches to Induction and uses its onboard battery to flush your entire home with the coolest outdoor air available. Your house and its thermal mass become a free “thermal battery” for the next day.

• Keeps your home noticeably cooler the next day and delays or reduces HVAC runtime
• Provides grid-independent comfort during heat waves and brownouts
• Reduces energy bills while improving overall comfort without adding humidity

Nightflush Mode pre-cools your entire home overnight using cool night air.

Destratification Mode: Winter Heating Savings + Whole-House Air Circulation

In Destratification Mode the SunCooler seals off outdoor air and recirculates indoor air only, driving warm ceiling air down to the living zone. You can also add optional fresh-air mix (0–100%) for CO₂ regulation or run it in Filter Mode for continuous air movement.

• Cuts winter heating costs up to 30% by eliminating wasted ceiling heat
• Improves indoor air quality year-round: Circulation breaks up stagnant air, reduces dust, allergens, and helps mitigate virus transmission (with or without fresh-air mix)
• Keeps the entire house comfortable with even floor-to-ceiling temperatures

Destratification (or Filter Mode) circulates air for even temperatures and better IAQ.

Next: Induction Mode | Bringing cool fresh outdoor air straight to the living spaces →

Induction Mode is where the SunCooler™ truly shines for homeowners who want to live more sustainably. The unit opens its internal dampers and pushes large volumes of cool, fresh outdoor air downward in a high-velocity column that reaches the floor and spreads throughout your living spaces.

This natural approach delivers powerful psychrometric cooling, the same principle used in high-performance green buildings and passive cooling strategies. Homeowners may find they can dramatically reduce or even turn off their HVAC system during hot summer days, lowering their carbon footprint while keeping the entire house comfortable.

• Reduces reliance on grid-powered HVAC: High-velocity fresh air provides effective cooling without burning fossil fuels or drawing from the electrical grid
• Energy independence during heat waves and blackouts: The SunCooler keeps delivering cool air on solar + battery even when the power is out
• Brings fresh outdoor air directly to living areas: Improves indoor air quality and creates a healthier, more breathable home environment
• The ultimate green climate-adaptation solution: High-velocity off-grid ventilation is proven to be one of the most effective ways to stay comfortable as summers get hotter

For a deeper look at how high-velocity natural airflow is becoming the preferred green alternative to traditional air conditioning, see our page on solar ventilation as the leading heat-mitigation strategy.

Induction Mode assertively pushes cool, fresh outdoor air straight to the floor for natural whole-house cooling.

Ready to experience sustainable, off-grid home comfort? →

The SunCooler™ gives you complete, intuitive control over every aspect of operation right from your laptop. Gain control and authroity over your home's indoor air quality with the SunCoolers's suite of temperature, humidity, CO2, and pressure sensors that can be monitored live and have historical data downloaded as a spreadsheet. Our user-friendly SunConfig software connects wirelessly to the unit through a closed local network (or via simple USB if you prefer zero wireless). No app subscriptions, no cloud, no internet... your information stays at your home in your control.

You can set any fan speed from gentle circulation all the way up to full-power high-velocity ventilation. Schedule automatic events throughout the day or let built-in sensors trigger modes based on temperature, humidity, or time of day. Everything is graphical and simple so no programming knowledge required.

• Full fan-speed control: Run the SunCooler aggressively for maximum ventilation or dial it down to a gentle whisper for everyday comfort
• Scheduled events: Automatically run Exhaust in the afternoon, Nightflush at night, or Destratification in the morning
• Smart automation: Temperature and humidity sensors can trigger the perfect mode at the perfect time
• Manual override: Many clients have used our simple rocker switches inside the house so you can walk in and instantly turn on your favorite mode with one flip
• Live monitoring: See real-time fan speed, battery status, and performance data anytime

SunConfig screen to adjust fan speed, schedule events, or switch modes instantly.

SunConfig monitor screen to see live sensor information of your home or other structures.

Ready to take full control of your home’s ventilation? →