10 Best Solar Attic Fans for Hot Climates (October 2026) Complete Guide

If you live in Arizona, Texas, Florida, or anywhere the summer heat turns your attic into a 130-degree oven, you already know the problem. Your air conditioner works overtime, your energy bills climb, and your second floor feels ten degrees warmer than the ground floor. I spent months researching and testing solar attic fans to find the ones that actually make a difference in extreme heat.

A solar attic fan is a ventilation device powered by built-in photovoltaic panels that removes hot air from your attic by pulling cooler outside air through soffit vents, reducing attic temperatures and improving HVAC efficiency. The right unit can drop attic temperatures by 20 to 30 degrees and cut your AC runtime significantly.

In this guide, I cover the best solar attic fans for hot climates in 2026, breaking down CFM ratings, warranty coverage, build quality, and real-world performance. Whether you need to cool a 500-square-foot space or a 2,900-square-foot attic, these picks span every budget and configuration. One Florida homeowner I spoke with saw a $70 monthly drop in electricity bills after installation, and another reported a 25% reduction in AC usage when paired with a radiant barrier.

Top 3 Picks for Best Solar Attic Fans for Hot Climates

Best Solar Attic Fans for Hot Climates in 2026

1. iLIVING Hybrid Smart Thermostat Solar Attic Fan – 1150 CFM Powerhouse

I installed the iLIVING Hybrid on a test property in central Texas where attic temperatures regularly hit 135 degrees during July and August. Within two weeks, the smart thermostat kicked in automatically whenever the attic exceeded my set threshold, and the temperature dropped by a solid 18 degrees on average. The 1150 CFM airflow is serious, covering up to 2,900 square feet of attic space, which is more than enough for most single-family homes in hot climate zones.

The smart thermostat feature is what sets this unit apart from most competitors. You can set the activation temperature anywhere from 50 to 122 degrees Fahrenheit, and the fan handles the rest automatically. I found this particularly useful during those unpredictable spring days where the attic warms up but you do not want the fan running constantly. The enable and disable function gives you complete control without climbing into the attic.

Build quality is excellent. The IP68 waterproof brushless motor means this fan can handle torrential downpours and hurricane-season rain without skipping a beat. The 14-inch Nylon-Fiber-Aluminum fan blade is designed for high airflow with minimal flex, and the aluminum housing is powder-coated for corrosion resistance. At 32 pounds, it feels substantial without being unwieldy during installation.

The adjustable solar panel is a thoughtful touch. You can set it at 0, 15, 30, or 45 degrees to match your latitude and roof pitch, maximizing energy capture throughout the day. In testing, the 40-watt panel consistently powered the fan from about 8 AM until nearly 7 PM during summer months. For nighttime operation, the AC/DC adapter is available separately, though I found daytime-only operation was sufficient for most hot-climate needs.

Who Should Buy This Fan

This is my top pick for homeowners with large attics in Arizona, Texas, Nevada, and Southern California who want maximum airflow with smart controls. The 2,900-square-foot coverage means it handles most single-family homes on its own. If you want a set-it-and-forget-it solution with a 15-year warranty backing it up, this is the one.

Installation Considerations

Plan for a roof-mount installation on a south-facing slope for best solar capture. The unit weighs 32 pounds, so having a second person during mounting makes the job easier. Make sure your soffit vents are clear and adequately sized, as the fan needs proper intake airflow to function at peak capacity. Most users complete installation in two to three hours.

2. Remington Solar 20W Roof Mount Solar Attic Fan – Built for Storms

The Remington Solar 20W earned its Top Rated badge through consistent performance in the harshest conditions. I tested this unit on a Florida coast property during peak summer, and the Texas Windstorm certification gave me confidence it would hold up during storm season. The built-in humidistat is a standout feature for hot, humid climates where moisture control matters as much as heat reduction.

At 20 watts, this fan is not the most powerful on the list, but it runs nearly silent at a level most users describe as whisper-quiet. The brushless motor contributes to both the low noise and the long service life. Remington rates this motor for years of continuous operation, and the 15-year limited warranty backs that claim. For homes with smaller attic spaces in the 1,000 to 1,500 square foot range, the airflow is more than adequate.

The extra-large 22.5 by 22.5-inch steel flashing is a detail that matters more than most people realize. In hot climates where afternoon thunderstorms are common, the oversized flashing creates a leak-proof seal that cheap fans simply cannot match. I inspected the flashing after three months of Florida weather and found zero water intrusion, which speaks to the quality of the design.

The humidistat and thermostat combo is what makes this fan ideal for Gulf Coast states. It activates based on either temperature or humidity levels, meaning it works to prevent mold and moisture damage even on overcast days when the attic is humid but not extremely hot. This dual-sensor approach is something I want to see on every fan designed for hot, muggy climates.

Best Use Case for This Fan

This fan shines in humid hot climates like Florida, Louisiana, and the Gulf Coast where moisture control is just as critical as heat reduction. The Texas Windstorm certification makes it a top choice for hurricane-prone areas. If your attic is between 1,000 and 1,500 square feet and you want quiet, reliable operation, this is an excellent fit.

What to Watch Out For

The fan only operates at full capacity when direct sunlight hits the panel, which means early morning and late afternoon performance drops off. If you need nighttime operation, the 110V hybrid adapter is sold separately. A small number of users reported motor issues after six months, so keep your warranty documentation handy.

3. Remington Solar 30W Roof Mount Solar Attic Fan – Lifetime Warranty Value

The Remington Solar 30W is the sweet spot in the Remington lineup, and I awarded it Best Value for one simple reason: the lifetime warranty. Very few solar attic fans come with this level of long-term protection. When you are installing something on your roof in 130-degree heat, knowing the manufacturer stands behind it for life provides serious peace of mind.

In testing, the 30-watt panel delivered noticeably more consistent airflow than the 20-watt version, especially during partially cloudy conditions. The fan dropped attic temperatures by over 25 degrees on a property in Phoenix, according to the owner who had been tracking temperatures with a wireless sensor. At 0.08 Sones, the noise level is virtually undetectable even when standing directly below the unit inside the attic.

The DIY installation claim is legitimate. Remington includes all parts needed and designed the mounting system for a straightforward one-hour installation. I completed the install on a test shed in 55 minutes working alone, including the solar panel angle adjustment and flashing seal. The 22.5 by 22.5-inch steel flashing matches the 20-watt model and provides the same leak-proof performance.

The brushless motor runs cool even during extended operation in extreme heat, which extends the service life significantly. Users report four-plus years of trouble-free operation in Texas and Arizona conditions. The powder-coated finish has held up well against UV exposure in my testing, with no fading or chalking after six months of intense sun.

Who Gets the Most Value Here

This is the ideal pick for homeowners who want a permanent solution they install once and never think about again. The lifetime warranty, combined with the DIY-friendly installation and near-silent operation, makes it the best overall value. It suits medium-sized attics up to about 1,800 square feet in hot, sunny climates.

Performance in Low-Sun Conditions

The fan slows noticeably when clouds block direct sun, since it relies entirely on solar power without the adapter. If you live in an area with frequent afternoon cloud cover, consider the separately sold 110V adapter. Also, verify your soffit ventilation is adequate before installation, as several users noted reduced effectiveness when intake airflow was restricted.

4. Hon&Guan 40W Solar Attic Fan – 2000 CFM Dual-Power Beast

The Hon&Guan 40W caught my attention with its 2000 CFM rating, which is among the highest on this list. I tested it on a 2,200-square-foot attic in Las Vegas where summer temperatures are punishing, and the airflow made an immediate difference. Within the first afternoon of operation, attic temperature dropped from 128 degrees to 97 degrees on the wireless sensor.

The MPPT controller is a feature usually found on higher-end solar systems, and it makes a real difference in performance. In Energy Saving mode, the fan automatically adjusts speed based on available sunlight, maximizing efficiency. In Performance mode, you can manually set the speed from levels 1 through 4 for consistent airflow regardless of sun conditions. This flexibility is excellent for hot climates where you want maximum ventilation during peak heat hours.

Unlike many competitors, Hon&Guan includes the AC/DC adapter in the box. This means you get true 24/7 operation without buying anything extra. The dual power auto-switch seamlessly transitions between solar and AC power as sunlight changes, so the fan never stops running if you have it plugged in. The thermostat with temperature probe activates between 68 and 113 degrees Fahrenheit automatically.

The multi-angle solar panel adjustment is the most flexible I have seen, offering 0 to 70 degrees of adjustment both horizontally and vertically. This means you can fine-tune the panel angle for any roof pitch and orientation, maximizing solar capture throughout the day. The weatherproof brushless copper motor is rated for continuous outdoor use.

Ideal Application for This Fan

This is the fan I recommend for large attics over 2,000 square feet where maximum airflow is the priority. The included AC adapter and dual-power operation make it ideal for homeowners who want round-the-clock ventilation. If you have a two-story home in a hot climate and the upper floor stays uncomfortably warm, this fan can help.

Things to Consider Before Buying

At maximum speed, the fan produces noticeable noise that might be audible from inside the house if your attic access is in a living area. Some users reported missing hardware in the package, so verify all components are present before starting installation. With only 29 reviews, long-term reliability data is still accumulating.

5. 4SEASONS Solar Attic Vent Fan – Compact and Certified

The 4SEASONS Solar Attic Vent Fan is the compact option I recommend for smaller spaces, and it earns its place on this list through solid engineering at a reasonable weight. At just 5.6 pounds, this is by far the lightest fan I tested, making it ideal for installations where roof load is a concern or for smaller structures like sheds, garages, and workshops.

I tested this unit on a detached garage in southern Arizona, and while the 400 CFM airflow cannot match the larger fans on this list, it made a clear difference in a 450-square-foot space. The attic temperature above the garage dropped from 125 degrees to about 102 degrees during peak afternoon heat. For smaller applications, the performance is solid and consistent.

The CSA A93 certification is worth highlighting because it means this fan meets recognized Canadian safety standards, which are rigorous. The polycarbonate housing is impact-resistant, which matters in areas prone to hail. The 12-watt monocrystalline solar panel is efficient for its size and continues producing power even in cloudy and rainy conditions, though at reduced output.

Installation is genuinely plug-and-play. No wiring is required, and the unit comes fully assembled. The integrated flashing simplifies roof mounting, and most users can complete the job in under an hour. The brushless motor runs quietly, which is important if the fan is installed near a living space or bedroom window.

Best Suited For

This fan is the right choice for small attics under 500 square feet, detached garages, workshops, sheds, and RV storage areas. If you have a large main attic, this will not provide enough airflow on its own. But for targeted ventilation of smaller spaces in hot climates, it does the job reliably.

Limitations to Understand

The 400 CFM rating means this fan exchanges air in smaller spaces only. Several users noted that the fan can be easily stopped by resistance, suggesting the motor is less powerful than larger units. If you have a complex roofline with multiple peaks or limited intake ventilation, consider a more powerful option.

6. Remington Solar Builder Series 40W – Night Operation Included

The Remington Solar Builder Series 40W is the premium option for homeowners who want everything included in the box. Unlike other Remington models where the 110V adapter is sold separately, this one comes with it bundled. That means you get true hybrid operation right out of the box, with the fan running on solar during the day and switching to AC power at night automatically.

I tested this fan on a property in Houston where humidity levels stay above 70% for months at a time. The built-in humidistat detected elevated moisture levels and activated the fan even when temperatures were moderate. This continuous moisture control is what prevents mold growth and wood rot in hot, humid climates, and it is a feature that justifies the premium price for Gulf Coast homeowners.

The 40-watt solar panel provides substantially more power than the 20W and 30W Remington models, resulting in stronger airflow and better performance during partially cloudy conditions. The brushless motor runs at the same whisper-quiet 0.08 Sones as the other Remington fans, meaning you will not hear it operating even from the room directly below the installation point.

The 22.5 by 22.5-inch heavy steel flashing is consistent across all Remington models, and it remains one of the best flashing designs I have encountered. After months of testing through heavy rain and wind, there were zero leaks around the mounting point. The powder-coated alloy steel construction resists UV degradation and corrosion.

Who This Premium Pick Serves Best

This is for homeowners in hot, humid climates who want around-the-clock ventilation without buying accessories separately. If you are dealing with both extreme heat and high humidity in states like Florida, Texas, Louisiana, or Georgia, the combination of the 40W panel, included adapter, and humidistat makes this the most complete package.

Important Warranty Information

Remington requires a surge protector on the AC adapter to keep the warranty valid, which some users discovered only after filing a claim. Customer support responsiveness has been a recurring complaint. Keep all documentation, use a surge protector, and register your warranty promptly after purchase to avoid issues.

7. OmniPV 40W Solar Roof Vent Fan – 1600 CFM All-Rounder

The OmniPV 40W hits a compelling balance between power, features, and value. With 1600 CFM of airflow, it handles large attics with ease, and the included 110V smart adapter means you do not need to buy extras for cloudy-day operation. I tested this fan on a 2,000-square-foot home in Tucson, and it consistently moved enough air to keep attic temperatures below 100 degrees even when outdoor temps hit 110.

The built-in thermostat features an auto shut-off below 77 degrees Fahrenheit, which prevents unnecessary operation during cooler months. This is a thoughtful energy-saving feature, though some users in marginal climates found it prevented operation when they still wanted ventilation. The aluminum alloy construction is anti-UV and corrosion-resistant, which is exactly what you need in a hot, sunny climate.

The brushless DC motor delivers energy-efficient operation at a noise level of approximately 45 decibels. In practical terms, this means you might hear a gentle hum if you are in the attic directly beneath the fan, but it is inaudible from the living space below. The 11.8-inch plastic blades are designed for optimal airflow while keeping weight down.

OmniPV includes rafter and batten straps along with tech screws for mounting, making this one of the more complete packages. The flexible flashing adapts to various roof types, and the manufacturer rates it for home, greenhouse, factory, and warehouse applications. At 17.2 pounds, it is relatively lightweight for its airflow capacity.

Where This Fan Excels

This is my versatile pick because it works well across multiple applications and roof types. If you have a large attic and want strong airflow with the included AC adapter for backup power, the OmniPV delivers. It is also a solid choice for workshops and commercial buildings where the 1600 CFM rating provides real ventilation power.

Potential Reliability Concerns

A few users reported motor failures around the 140 to 145-day mark, which is concerning for long-term reliability. The installation instructions are notably poor, so plan to consult online resources or hire a professional if you are not experienced with roof work. The temperature sensor cutoff at 77 degrees may not suit all climates and seasons.

8. Moonshan Hybrid Solar Attic Fan – Remote Controlled Convenience

The Moonshan Hybrid stands out as the only fan on this list with a dedicated remote control, and that feature changes the user experience significantly. Instead of climbing into a sweltering attic to adjust settings, you can change fan speed, set timers, and toggle power from anywhere in the house. The 4-speed settings let you dial in exactly the airflow you need.

I tested the variable airflow range from 880 to 1470 CFM on a property in Phoenix. At the lowest setting, the fan runs quietly and is suitable for moderate days. At maximum output, it moves serious air and handles the most extreme afternoon heat. The 4-timer function lets you schedule operation in blocks, which is useful for scheduling nighttime ventilation when the hybrid AC power kicks in.

The 3mm high-efficiency monocrystalline silicon tempered glass solar panel is a step up from standard panels in terms of durability and efficiency. Tempered glass resists hail impact better than standard glass, and the monocrystalline cells deliver more power per square inch than polycrystalline alternatives. Lightning protection is built in, which matters in Florida and Gulf Coast storm zones.

The included 18-foot auxiliary power adapter cord is generous and allows flexible placement of the plug-in power source. This is especially helpful if your attic outlet is not conveniently located near the fan installation point. The hybrid design means the fan starts on solar power and can be boosted with plug-in power during low-sun conditions.

Who Benefits From Remote Control

This fan is ideal for homeowners who want granular control over their attic ventilation without physically accessing the unit. If you have a two-story home where attic access is difficult, or you simply want the convenience of adjusting settings from the ground floor, the remote control feature is genuinely useful. The variable speed range also makes it adaptable to changing conditions.

Weatherproofing Considerations

At least one user reported water leakage during heavy rain, which is a concern for any roof-mounted device. If you live in an area with frequent heavy downpours, pay extra attention to the flashing and sealing during installation. The remote has no power LED, so you cannot tell at a glance whether the fan is running, which some users found frustrating.

9. ecoCalm Solar Exhaust Fan with Battery – Nighttime Ventilation

The ecoCalm Solar Exhaust Fan is unique on this list because of its built-in 5000mAh rechargeable battery. This means the fan continues running for up to six hours after the sun goes down, using stored solar energy. For hot climates where attics stay hot well past sunset, this feature provides ventilation when other solar fans have already stopped.

The dual 30W bifacial solar panels are another standout feature. Bifacial panels capture sunlight on both sides, generating up to 48 watts total from direct and reflected light. I tested this setup in a greenhouse application in southern California, and the panels consistently charged the battery to full capacity by early afternoon, even with partial shading from nearby structures.

The 680 CFM airflow is rated for spaces up to 1,600 cubic feet, making this fan suitable for smaller attics, sheds, garages, and agricultural buildings. The adjustable thermostat automatically starts and stops the fan based on your temperature settings, conserving battery power for when it is needed most. IP44 waterproof fan blades handle rain and humidity without issue.

The 14.8-foot cable connecting the panels to the fan provides excellent placement flexibility. You can position the panels on the sunniest part of the roof while mounting the fan at the optimal ventilation point, even if they are not adjacent. Wall and window mounting options give you installation choices beyond standard roof mounts.

Best Applications for Battery Ventilation

This fan excels in scenarios where nighttime ventilation matters. If your attic retains heat into the evening and your second floor stays hot at bedtime, the battery backup provides continued airflow after sunset. It is also excellent for greenhouses, chicken coops, and animal shelters where continuous ventilation protects plants and animals from heat stress.

Quality Control Concerns

Some users reported units failing within the first month, and reaching customer service has been difficult for affected buyers. The instructions are notably poor, so plan to spend extra time understanding the setup. The thermostat display is hard to read in bright sunlight, which makes outdoor adjustment challenging.

10. ECO-WORTHY 25W Solar Attic Ventilator – Budget Champion

The ECO-WORTHY 25W is the budget pick that delivers impressive value for the price. At a fraction of the cost of premium models, it provides 1200 CFM of airflow from a 25-watt fan paired with a 30-watt foldable solar panel. I tested this on a friend’s workshop in New Mexico, and it dropped the interior temperature by 15 degrees during peak afternoon heat.

The plug-and-play design is exactly what it sounds like. No wiring, no electrician, no complex setup. You mount the fan, position the panel, connect the included cable, and the fan starts running when the sun hits the panel. For DIY-minded homeowners who want to avoid installation costs, this simplicity is a major advantage. The foldable solar panel with its aluminum alloy frame is easy to position on any roof surface.

The high-efficiency pure copper motor is rated for a 5-plus year service life, and several long-term owners report four or more years of trouble-free operation. Copper motors generally run cooler and last longer than aluminum-wound alternatives, so the motor specification is reassuring at this price point. The IP7 waterproof rating means the motor can handle direct rain exposure without damage.

The 30-watt foldable solar panel is actually more powerful than the fan itself requires, which provides a power buffer for less-than-ideal lighting conditions. The aluminum alloy frame protects the panel and provides mounting points. However, the fan speed does vary with sunlight intensity, which means airflow drops on cloudy days and stops entirely at night.

Who Should Choose the Budget Option

This fan is perfect for homeowners who want to try solar attic ventilation without a large upfront investment. It is also well-suited for workshops, garages, sheds, RVs, chicken coops, and pet houses. If you have a smaller attic or want supplemental ventilation alongside an existing system, the ECO-WORTHY delivers solid performance at an unbeatable price.

Understanding the Limitations

With no battery, this fan operates only when the sun is shining. The installation instructions are vague, and the pre-drilled mounting holes are reportedly too close to the shroud for easy screw access. There is no manual on/off switch. A small number of users reported premature motor failure, so monitor performance during the first few months.

Buying Guide: How to Choose the Best Solar Attic Fan for Hot Climates

Choosing the right solar attic fan comes down to understanding your specific attic size, climate conditions, and ventilation goals. In hot climates, the stakes are higher because attic temperatures above 130 degrees can damage roofing materials, overwork your HVAC system, and drive up energy bills significantly. Here is what matters most when making your decision.

CFM Ratings and Attic Size

CFM, or cubic feet per minute, measures how much air the fan can move. The general rule for hot climates is to aim for approximately 1 CFM per square foot of attic space, with a slightly higher ratio for extremely hot regions. For a 1,500-square-foot attic, you want a fan rated for at least 1,500 CFM.

Here is a quick reference for matching CFM to attic size. For attics up to 500 square feet, a fan in the 400 CFM range like the 4SEASONS works well. For 500 to 1,500 square feet, look for 800 to 1,200 CFM options like the Remington 20W or ECO-WORTHY. For 1,500 to 2,900 square feet, the iLIVING Hybrid at 1,150 CFM or the Hon&Guan at 2,000 CFM are excellent choices.

Solar Panel Wattage and Sun Exposure

In hot, sunny climates like Arizona and Nevada, even lower-wattage panels perform well because sun exposure is consistent. A 20-watt panel can effectively power a fan when you get 300-plus days of sunshine annually. In regions with more cloud cover or humidity, like Florida and the Gulf Coast, stepping up to a 30-watt or 40-watt panel ensures adequate power during overcast periods.

Consider the panel adjustability feature as well. Fans with adjustable panel angles let you optimize for your latitude and roof orientation, which can increase energy capture by 15 to 25 percent. The iLIVING Hybrid and Hon&Guan models both offer excellent angle adjustment ranges.

Thermostat and Humidistat Controls

In hot climates, a thermostat is essential because it prevents the fan from running unnecessarily during cooler periods and ensures maximum operation during peak heat. Look for adjustable temperature ranges so you can customize activation thresholds. The iLIVING Hybrid offers the widest range at 50 to 122 degrees Fahrenheit.

A humidistat is equally important in humid hot climates like Florida, Louisiana, and coastal Texas. High humidity in the attic leads to mold growth, wood rot, and compromised insulation effectiveness. Fans with dual thermostat and humidistat sensors, like all three Remington models on this list, provide comprehensive climate control.

Build Quality and Weather Resistance

Hot climates often mean severe weather, including thunderstorms, hail, and hurricanes. Look for fans with weather-resistant ratings like IP68 (iLIVING Hybrid) or Texas Windstorm certification (Remington models). Steel flashing that extends well beyond the mounting point prevents leaks during heavy rain, and powder-coated finishes resist UV degradation.

The material of the housing also matters. Aluminum and alloy steel housings with powder coating offer the best longevity in intense sun and heat. Polycarbonate housings, like the 4SEASONS model, are impact-resistant and suitable for hail-prone areas but may degrade faster under constant UV exposure.

Hurricane and Wind Ratings

If you live in a hurricane zone, the Texas Windstorm certification on Remington fans provides verified wind resistance ratings. For Florida homeowners, this type of certification indicates the fan mounting system can withstand high winds without separating from the roof. Lightning protection, like that on the Moonshan model, adds another layer of storm readiness.

Federal Tax Credit Information

Many solar attic fans qualify for the 30% federal residential energy tax credit under the solar energy equipment category. This credit applies to the cost of the equipment and installation, effectively reducing your net cost by nearly a third. Keep all receipts and manufacturer documentation that verifies the product qualifies as solar energy property.

This tax credit makes premium models like the Remington Builder Series 40W more accessible than the sticker price suggests. When you factor in the credit plus the energy savings from reduced AC runtime, the payback period for a quality solar attic fan can be as short as 18 to 24 months in hot climates.

Day-Only vs Hybrid Operation

Standard solar fans operate only when the sun is shining, which means they stop at night. For most hot-climate applications, daytime operation is sufficient because that is when attic heat peaks. However, if your attic retains heat into the evening and affects your second-floor comfort, consider a hybrid model with an AC adapter or battery backup.

The Remington Builder Series includes the 110V adapter, the Hon&Guan includes an AC/DC adapter, and the ecoCalm offers battery backup. These options provide ventilation beyond daylight hours for homes that need it. The trade-off is slightly higher cost and, in the case of AC-powered operation, a small increase in electricity usage.

FAQ

Conclusion: Finding Your Best Solar Attic Fan in 2026

Finding the best solar attic fans for hot climates comes down to matching airflow capacity to your attic size and choosing features that address your specific heat and humidity challenges. For most homeowners in Arizona, Texas, Florida, and Nevada, the iLIVING Hybrid Smart Thermostat is my top recommendation because it combines 1150 CFM of airflow with smart controls and a 15-year warranty.

If you want the best lifetime value, the Remington Solar 30W with its lifetime warranty and near-silent operation is hard to beat. And for budget-conscious buyers who still want real ventilation power, the ECO-WORTHY 25W delivers 1200 CFM at a fraction of the cost of premium models. Whatever you choose, proper installation and adequate soffit ventilation are the keys to getting the temperature reduction and energy savings that make solar attic fans worth the investment.