Is there a consensus whether Honeywell's Humidicalc is better or worse
than using an actual outdoor sensor, as with Aprilaire humidifiers that
automatically adjust the humidity?

The following is from a Honeywell PDF manual:
"The HumidCalc+™ software inside your automatic humidity control is
designed to measure or infer outdoor temperature and automatically
adjust the humidity based on the frost factor setting that the homeowner
sets to allow for variances in furnace size, window type and insulation."

In trying to find info on the web, I found this:

"Honeywell humidistat wins 'Seven Wonders' Engineering Award.
Contracting Business, April, 1999

"No outdoor sensor needed for most applications Honeywell's new
humidistat has earned a Seven Wonders of Engineering Award from the
Minnesota Society of Professional Engineers. The H1008 Automatic
Humidity Control with HumidiCalc+[TM] Software is the first standalone
humidistat to control to dewpoint instead of relative humidity."

Thank you very much.
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