HGinline 40W Solar Attic Fan
#6 in Roof mountFull review
A flexible hybrid fan with speed control for a buyer who wants night running on a budget. The lack of a stated warranty is the main risk.
Amazon $299.99$299.99
The HGinline 40W Solar Attic Fan rates 3.4 among roof mount solar attic fans; the QuietCool AFG SLR SMT 50W Gable Fan rates 3.3 among gable mount ones. The HGinline 40W Solar Attic Fan costs $59.01 less ($299.99 vs $359).
QuietCool AFG SLR SMT 50W Gable Fan
#3 in Gable mountFull review
For a gable vented attic where the owner wants app control and steady airflow around the clock, at the same price as the simpler AFG SLR-40.
Amazon $359$359
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.
Scores side by side
These two sit in different mount classes (roof mount and gable mount), and each is scored against the reference points for its own class, so a rating says how well each does among its own mount peers. How we rank explains each factor.
| Factor weight | HGinline 40W Solar Attic Fan | QuietCool AFG SLR SMT 50W Gable Fan |
|---|---|---|
| Overall rating | 3.4/5 | 3.3/5 |
| Value 25% | 71 $0.17 per CFM ($299.99, 1,800 CFM credited of 2,000 claimed (45 per panel watt)) | 61 $0.20 per CFM ($359, 1,780 CFM) |
| Airflow 15% | 63 1,800 CFM credited of 2,000 claimed (45 per panel watt) | 62 1,780 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% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| HGinline 40W Solar Attic Fan | QuietCool AFG SLR SMT 50W Gable Fan | |
|---|---|---|
| Airflow | ||
| Mount | Roof | Gable |
| Airflow | 2,000 CFM | 1,780 CFM |
| Attic area | 2,500 sq ft | 2,250 sq ft |
| Fan | 12 in | - |
| Motor | brushless DC | DC |
| Power | ||
| Panel | 40 W | 50 W |
| Separate or tilting panel | Yes | - |
| Thermostat | Yes | Yes |
| AC backup | Yes | Yes |
| Build | ||
| Weight | 26.5 lb | - |
| Released | - | 2026-09 |