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 2.8. The Remington Solar Builder Series 40W leads on features. The QuietCool AFR SLR SMT 50W Roof Fan wins on panel. The QuietCool AFR SLR SMT 50W Roof Fan costs $50 less ($439 vs $489).
QuietCool AFR SLR SMT 50W Roof Fan
#11 in Roof mountFull review
For a homeowner who wants to watch and control attic conditions from a phone and run around the clock. Buyers after the most airflow per dollar should look elsewhere.
Amazon $439.99 QuietCool $439$439
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 features (thermostat, AC backup, separate or tilting panel vs thermostat, AC backup).
- Choose the QuietCool AFR SLR SMT 50W Roof Fan for panel (50 W panel vs 40 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 | QuietCool AFR SLR SMT 50W Roof Fan |
|---|---|---|
| Overall rating | 3.9/5 | 2.8/5 |
| Value 25% | 34 $0.33 per CFM ($489, 1,500 CFM) | 24 $0.39 per CFM ($439, 1,119 CFM) |
| Airflow 15% | 47 1,500 CFM | 27 1,119 CFM |
| Panel 20% | 60 40 W panel | 80 50 W panel |
| Features 15% | 100 thermostat, AC backup, separate or tilting panel | 70 thermostat, AC backup |
| Warranty 25% | 100 lifetime warranty | 0 warranty not published, scored as none |
Specifications
| Remington Solar Builder Series 40W | QuietCool AFR SLR SMT 50W Roof Fan | |
|---|---|---|
| Airflow | ||
| Mount | Roof | Roof |
| Airflow | 1,500 CFM | 1,119 CFM |
| Attic area | 2,400 sq ft | 1,500 sq ft |
| Motor | brushless DC | DC |
| Power | ||
| Panel | 40 W | 50 W |
| Separate or tilting panel | Yes | - |
| Thermostat | Yes | Yes |
| AC backup | Yes | Yes |
| Build | ||
| Weight | 31 lb | - |
| Warranty | Lifetime | - |
| Released | - | 2026-06 |