Whole house fans earn their keep at night, pulling cool evening air through open windows while the house sleeps. That makes them one of the few appliances bought almost entirely on their noise, and the category responds: four makers publish real figures, and the best pair their decibels with airflow, speed tables and HVI-916 ratings.
Nineteen models carry maker published figures. The range runs from "33.0" dBA, QuietCool's Energy Saver on low, to 68 at the top of AirScape's biggest range.
The sone era is over
Whole house fans were long a sone category, like the bathroom exhaust fans and range hoods they share an industry with. No longer: every current spec sheet in our sweep publishes decibels. QuietCool's sheets carry a per-speed dBA row, AirScape publishes a min to max range, Centric Air prints dBA per speed, and Solatube writes plain dB. The sone figures still quoted around the web for Tamarack fans trace to retailer blogs, while Tamarack's own spec sheet publishes airflow, watts and R values and no noise figure at all, which keeps an otherwise interesting fan out of this guide.
What did not survive the transition is rigor. Only two figures in the entire category state a measuring distance, both AirScape's. Nobody names a standard for the acoustics, even as the airflow side is properly HVI-916 rated. Our comparing decibel ratings explainer says why that caps what cross brand gaps can prove.
Read the low speed column
These fans run overnight on low, and the low speed figures are where the category shines. QuietCool's ES-3100 publishes "Low: 33.0" dBA against "2,020 CFM", which is more air per published decibel than nearly anything on this site. The ECM Energy Saver line also cuts wattage roughly in half against the AC motor Classics at matched sizes, 79.5 W against 201 W on the 2250s' low speeds.
The duplicate rows deserve honesty: the ES-4700 prints the identical "47.4 / 33.0" row as the ES-3100 despite a larger fan, QuietCool's two big Classics share a 49.4 high, and every Centric Air size declares the same 49 and 47. Figures that repeat across different machines read as line-level declarations, and we rank them with that grain of salt stated.
Ducted boxes against direct fans
Every quiet leader here is a ducted damper box design: the fan hangs in the attic and a stretch of duct separates it from the ceiling grille. AirScape's Sierra adds powered R13 damper doors and ships acoustic ducting in the box; QuietCool hangs its heads on suspension with R5 barometric dampers; Solatube uses R6 doors and includes the duct. Direct through-ceiling designs, AirScape's Ventura line and the unrated Tamarack and Cool Attic fans, put the blades at the grille, and AirScape's own numbers show the cost: the direct Ventura 1700 starts at "44" dBA where the ducted fans start in the 30s.
The Ventura 1700 still earns its pick, because shallow attics exist and because its "44 to 55 dBA @ 1m" is one of only two figures in the category that says where the microphone stood.
A sourcing note
QuietCool's website refused our connection outright, so every QuietCool figure here was read from archived copies of QuietCool's own spec sheet PDFs, with the maker's canonical URLs cited and the current RF revision cross checked against an older sheet showing identical figures. AirScape, Centric Air, Solatube and Tamarack were read live.
We did not measure any of these fans. Every figure is the maker's own, quoted as published, with the condition attached wherever the maker attached one.
