Remington Solar Builder Series 40W
#1 in Roof mountFull review
For a larger attic where the owner wants night running and a lifetime fan warranty in one box. The price is hard to justify on airflow alone.
Amazon $489$489
The Remington Solar Builder Series 40W is the better solar attic fan overall, rated 3.9 to 3.2. The Remington Solar Builder Series 40W leads on features and panel. The Remington Solar Builder Series 40W costs $165.70 less ($489 vs $654.70).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Natural Light SAF32 Solar Attic Fan
#12 in Roof mountFull review
For a medium attic where a lifetime warranty and an all aluminum build matter more than price. Cheaper hybrid fans move as much air for less than half the money.
Amazon $654.70$654.70
Which should you buy?
- Choose the Remington Solar Builder Series 40W for features (thermostat, AC backup, separate or tilting panel vs separate or tilting panel) and panel (40 W panel vs 32 W panel).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every roof mount solar attic fan; a clear win is highlighted. How we rank explains each one.
| Factor weight | Remington Solar Builder Series 40W | Natural Light SAF32 Solar Attic Fan |
|---|---|---|
| Overall rating | 3.9/5 | 3.2/5 |
| Value 25% | 34 $0.33 per CFM ($489, 1,500 CFM) | 15 $0.45 per CFM ($654.70, 1,440 CFM credited of 1,560 claimed (45 per panel watt)) |
| Airflow 15% | 47 1,500 CFM | 44 1,440 CFM credited of 1,560 claimed (45 per panel watt) |
| Panel 20% | 60 40 W panel | 44 32 W panel |
| Features 15% | 100 thermostat, AC backup, separate or tilting panel | 30 separate or tilting panel |
| Warranty 25% | 100 lifetime warranty | 100 lifetime warranty |
Specifications
| Remington Solar Builder Series 40W | Natural Light SAF32 Solar Attic Fan | |
|---|---|---|
| Airflow | ||
| Mount | Roof | Roof |
| Airflow | 1,500 CFM | 1,560 CFM |
| Attic area | 2,400 sq ft | 2,200 sq ft |
| Motor | brushless DC | DC |
| Power | ||
| Panel | 40 W | 32 W |
| Separate or tilting panel | Yes | Yes |
| Thermostat | Yes | No |
| AC backup | Yes | No |
| Build | ||
| Weight | 31 lb | - |
| Warranty | Lifetime | Lifetime |