U.S. Sunlight Solar Attic Fan Review

U.S. Sunlight Solar Attic Fan Review

If your home has an attic, you might be surprised to learn that it can have a significant impact on your HVAC system. Many attics accumulate heat in the summer and moisture in the winter. Both extremes can force your HVAC unit to work harder.

Thankfully, there’s a solution to this problem: a solar-powered attic fan. An attic fan will help circulate air in your attic to prevent heat build-up. However, the vast array of solar attic fans on the market can make it challenging to choose the right one for your home.

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Remington Solar Attic Fan (20 Watt)

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U.S. Sunlight is one of the best solar attic fans available, but is it the right one for you? In this U.S. Sunlight solar attic fan review, we’ll take a closer look at their most popular model, the 25-watt roof-mount solar attic fan. U.S. Sunlight also offers a smaller 10-watt roof-top fan and a 25-watt gable-mount option.

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U.S. Sunlight Solar Attic Fan Overview

What Is a U.S Sunlight Solar Attic Fan?

Best Solar Attic Fan - US Sunlight

As the name suggests, the U.S Solar Attic Fan uses solar energy to function, which saves energy. Additionally, the solar fan only runs when you need it. Drawing energy from the sun, it runs at its best on hot days where your attic temperature is likely to be higher.

This model is roof-mounted and needs to be placed in a location with maximum sun exposure. It’s adequate for up to 2,600 square feet of attic space, making it powerful enough for most single-family homes.

U.S. Sunlight’s Solar Attic Fans Features

The U.S. Sunlight brand makes their fans in China. Each fan includes a low-profile, galvanized steel protective dome housing, three rust-resistant blades, and a 38-volt motor.  Other features that come with the solar fan include:

Heavy-duty Construction

This fan features a heavy-duty ABS fan cover that protects the blades and motor from debris and inclement weather, while the commercial-grade solar panel is built to withstand even the most extreme conditions. It is wind-, hail-, and corrosion-resistant.

Auto-tilt Maximizes Sun Exposure

As the sun moves throughout the day, the solar panel tilts and rotates, maximizing sun exposure and so power production, allowing the fan to run longer and stronger.

Powerful 38-Volt Motor

The U.S. Sunlight solar attic fan is 25% more powerful than most attic fans on the market, allowing for superior cooling even in large spaces.

Easy Installation

As no electrical hook-up is required, this solar attic fan is relatively easy to install. The entire process takes less than an hour and only requires basic hand tools.

All-in-One Package

U.S. Sunlight solar attic fans come ready to install and don’t require any additional parts, such as a solar controller. However, if you wish, you can add a solar controller for night-time use.

Not sure if an attic fan is worth the investment? Check out our post Do attic fans really work to learn more.

Technical Specifications

  • Wattage: 25W
  • Venting Capacity: 1,820 CFM (2,600 square feet of attic space)
  • Assembled Dimensions: 24″ x 12″ x 24″
  • Motor Voltage: 38 volts
  • Number of blades: 3
  • Material: 20-gauge steel
  • Warranty:
    • Motor: 5-year limited
    • Solar panel and housing: 20-year limited

Who Is This Product for?

The U.S Sunlight solar attic fan is ideal for anyone looking to save on heating and cooling costs without increasing their electric bill. In the summer, the fan will greatly reduce attic temperatures. High attic temperatures can increase cooling costs by as much as 43%!

In the winter, the fan will act to remove moisture, preventing common issues such as mold and mildew while ensuring your attic insulation isn’t damaged. Insulation moisture can lead to the need for premature replacement and increase heating costs.

U.S. Sunlight Solar Attic Fan Review

The U.S. Sunlight Solar Attic Fan is one of the least expensive models on the market and packs a powerful punch for the price. Its oversized 38-volt motor provides up to 25% more power than similarly priced solar options, and its commercial-grade solar panel tilts and swivels automatically to maximize power production. The result is a robust yet efficient solar fan that can effectively cool attics up to 2,600 square feet in size.

It’s also versatile, as it can be installed stand-alone or with a solar controller for night-time use. When installed without a solar controller, the unit will only run during the day. This option may be fine if night-time temperatures tend to be lower in your area and extreme temperature swings are uncommon.

If you add a solar controller, you can hard-wire your solar attic fan to your home’s electrical system. In which case, the fan will kick on for 8 minutes every half hour to keep your attic cool without significant energy use.

This option also comes with a generous limited warranty on the motor, solar panel, and housing and is eligible for the Federal Residential Energy Credit. You can claim 30% of your installation costs, including the cost of the solar fan itself and labor, should you work with an installer.

Pros: What We Like About the U.S. Sunlight Solar Attic Fan

  • The use of solar energy means that the fan is only on when it’s needed.
  • Renewable power is greener than other energy production methods, reducing your carbon footprint while still keeping your house cool.
  • It has a tilted solar panel that allows for maximum sun exposure.
  • Installation is easy as no electrical hook-up is required.
  • The solar panel is durable to ensure long-term attic cooling.
  • Installation increases the lifespan of your home and roof by 10%.
  • It comes with a 5-year-warranty on the motor and a 20-year warranty on solar panels and casing.

Cons: What We Don’t Like About the U.S. Sunlight Solar Attic Fan

  • The addition of the solar panel makes the U.S. Sunlight Solar Attic Fan more expensive than other models.
  • The solar fan can only go on shingled roofs.
  • Reliance on solar energy makes them slightly less powerful than typical attic ventilating fans.
  • While installation is more straightforward than other models, it still requires cutting a hole in your roof. Incorrectly installing it could create a leak.
  • The solar fan isn’t suitable for homes in cloudy regions.

U.S. Sunlight Solar Attic Fan Alternatives

If, for any reason, you don’t like this attic fan, you might want to consider the Remington solar-powered attic fan or Broan. These are two of the best U.S. Sunlight Solar Attic Fan alternatives.

Looking for more U.S. Sunlight alternatives? Check out our comparison post on the best solar powered attic fans.


Best Solar Attic Fan - Remington

Product Details:

  • Roof-Mounted
  • Available at Different Power Levels
  • 20 to 40 Watts
  • 1,280 to 2,340 CFM
  • Lifetime Warranty

Remington Solar Attic Fans are some of the best solar attic fans for keeping your attic cool. These roof-mounted solar fans come equipped with a thermostat and humidistat for precise temperature regulation. Based on this data, it can increase or decrease the fan speed automatically.

Remington Fans also have an adapter to switch back and forth from solar to electric power easily. The censor is automatic, so your fan will switch back to running on solar power as soon as it detects sunlight. Check out our detailed Remington Solar Attic Fan Review for more information.


Best Solar Attic Fan - Broan

Product Details:

  • Roof-Mounted
  • Plastic
  • 28 Watts
  • 537 CFM
  • 6-Year Warranty

The Broan-NuTone 345SOWW Surface Mount Attic Solar Fan is a good choice if you’re looking for something affordable. The basic materials keep the cost low, so you can get the ventilation system you need at the price you want.

Unfortunately, this model has a pretty low CFM compared to its competitors, so it won’t be as efficient. It also doesn’t come with a thermostat, humidistat, or any hybrid electric capabilities. For a small space, however, it should be an adequate solution in a pinch.

Final Thoughts

Overall, U.S. Sunlight’s solar attic fan is built tough and has suitable power for the average home. Installation is easy and comes with some customization options, such as wired or stand-alone power. As it falls on the lower end of the price scale, it’s an excellent option if you’re looking for a low-cost solution to maintain stable, cool attic temperatures.

We hope this U.S. Sunlight solar attic fan review helps you make an informed decision. Feel free to check out our other reviews if you’re still not sure this is the right fan for your home.