Quest Honeywell HumidiPro Digital Humidistat

Honeywell HumidiPro Digital Humidistat for Quest Systems

This is a Honeywell-manufactured digital humidistat sold by Quest for use with Quest and Santa Fe 24V humidifiers and dehumidifiers, giving those systems a dedicated humidity control interface beyond whatever onboard controls the unit itself has.

It installs either as a wall-mount control or directly in an HVAC return duct, and runs in automatic mode using an outdoor sensor or in manual mode with a fixed relative humidity setting, depending on how much hands-on adjustment an operation wants to do.

Key Features & Benefits

• 24V compatibility with Quest and Santa Fe systems — works across both brands' 24V humidifiers and dehumidifiers rather than being locked to one product line.
• Wall-mount or return duct installation — installers can choose the mounting location that fits the specific facility layout rather than being locked into one installation style.
• Automatic mode with outdoor sensor — adjusts humidity targets based on outdoor conditions when paired with the appropriate sensor, rather than running a fixed setpoint regardless of outside weather.
• Manual relative humidity setting — gives operators direct control over a fixed target humidity when automatic adjustment isn't wanted.
• Digital display and control — provides clear readouts rather than a basic analog dial with no feedback on actual conditions.

Who Should Use This

This humidistat fits operators of Quest or Santa Fe 24V humidity control systems who want a dedicated Honeywell control interface, whether they prefer automatic outdoor-sensor-based adjustment or a straightforward manual humidity setpoint.

About Quest

Quest is a Therma-Stor brand. It focuses on commercial dehumidification. Therma-Stor is headquartered in Madison, Wisconsin. It's the same parent company behind the Anden brand. Therma-Stor has built dehumidifiers and environmental-control equipment for decades. Quest specifically targets commercial and industrial moisture control. Think indoor cultivation, food production, and commercial buildings. That's a different focus than residential basement units. Many overhead models use the company's patented M-CoRR design. M-CoRR stands for multi-coil refrigeration. The design recycles heat pulled from the air. That happens during dehumidification itself. It improves energy efficiency as a result. It also cuts heat sent back into the room.

Frequently Asked Questions

Does this humidistat work with Santa Fe equipment, or only Quest?

It's compatible with both Quest and Santa Fe 24V humidifiers and dehumidifiers, since both brands use a compatible 24V control interface. Confirm your specific unit runs on 24V control wiring before purchasing.

What's the difference between automatic and manual mode?

Automatic mode uses an outdoor sensor to adjust the humidity target based on outside conditions, which is useful where outdoor humidity swings significantly by season. Manual mode instead holds a fixed relative humidity setting that the operator sets directly, without factoring outdoor conditions into the target.

How is this installed in an HVAC return duct instead of on a wall?

It's designed to support either wall-mount installation or direct installation in an HVAC return duct. Choose based on your facility's layout and whichever location gives the most representative humidity reading for the space being controlled.

Is the outdoor sensor included with this humidistat?

Check the current product listing and packaging to confirm whether the outdoor sensor ships with the humidistat or is sold separately, since automatic mode depends on that sensor being connected. Manual mode operation does not require the outdoor sensor.