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 3.0. The Remington Solar Builder Series 40W leads on warranty, panel and features. The QuietCool AFR SLR-25 Solar Roof Fan costs $210 less ($279 vs $489).
QuietCool AFR SLR-25 Solar Roof Fan
#9 in Roof mountFull review
For a small attic where a low cost hybrid fan with a long warranty matters more than airflow. Larger attics need the 40 W model or two fans.
Amazon $309 QuietCool $279$279
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Remington Solar Builder Series 40W for warranty (lifetime warranty vs 15-year warranty), panel (40 W panel vs 25 W panel) and features (thermostat, AC backup, separate or tilting panel vs thermostat, AC backup).
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 | QuietCool AFR SLR-25 Solar Roof Fan |
|---|---|---|
| Overall rating | 3.9/5 | 3.0/5 |
| Value 25% | 34 $0.33 per CFM ($489, 1,500 CFM) | 39 $0.30 per CFM ($279, 927 CFM) |
| Airflow 15% | 47 1,500 CFM | 17 927 CFM |
| Panel 20% | 60 40 W panel | 30 25 W panel |
| Features 15% | 100 thermostat, AC backup, separate or tilting panel | 70 thermostat, AC backup |
| Warranty 25% | 100 lifetime warranty | 58 15-year warranty |
Specifications
| Remington Solar Builder Series 40W | QuietCool AFR SLR-25 Solar Roof Fan | |
|---|---|---|
| Airflow | ||
| Mount | Roof | Roof |
| Airflow | 1,500 CFM | 927 CFM |
| Attic area | 2,400 sq ft | 1,200 sq ft |
| Motor | brushless DC | 24V brushless DC, IP67 |
| Power | ||
| Panel | 40 W | 25 W |
| Separate or tilting panel | Yes | No |
| Thermostat | Yes | Yes |
| AC backup | Yes | Yes |
| Build | ||
| Weight | 31 lb | - |
| Warranty | Lifetime | 15 years |