Cleanroom & Contamination Control worked example

Cleanroom Humidity Control Cost at 55% hours requiring active humidity control: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop hours requiring active humidity control to 55%, then walk the calculation through step by step. Estimate humidity-control operating cost for a cleanroom using controlled hours, humidification or dehumidification cost per hour, active-control share, and fixed service cost.

The inputs for this scenario

  • Humidity-controlled cleanroom hours: 720 room-hr (held at the documented default)
  • Humidity control cost per hour: 42 $ / room-hr (held at the documented default)
  • Hours requiring active humidity control: 55 % (the input this scenario stresses; the baseline uses 76)
  • Fixed sensor calibration, desiccant, steam, or service cost: 5,100 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable humidity-control operating cost = humidity-controlled cleanroom hours × humidity control cost per hour × hours requiring active humidity control.
  • Total cleanroom humidity control cost works out to 21,732 total cleanroom humidity control cost at these inputs, and this is the headline figure for the scenario.
  • Humidity control cost per room-hour works out to 30.18 $ / piece at these inputs.
  • Variable humidity-control operating cost works out to 16,632 $ at these inputs.
  • Fixed sensor calibration, desiccant, steam, or service cost works out to 5,100 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where hours requiring active humidity control sits at 76% and the headline result is 28,082 total cleanroom humidity control cost, this scenario comes in 22.61% below the baseline at 21,732 total cleanroom humidity control cost.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to hours requiring active humidity control, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. A single cost-per-hour rate blends humidification and dehumidification, which behave very differently by season and load; in humid summers desiccant or chilled-water cost can far exceed the average, while winter steam humidification dominates elsewhere.

Results at a glance

  • Total cleanroom humidity control cost: 21,732 total cleanroom humidity control cost (headline result)
  • Humidity control cost per room-hour: 30.18 $ / piece
  • Variable humidity-control operating cost: 16,632 $
  • Fixed sensor calibration, desiccant, steam, or service cost: 5,100 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Cleanroom Humidity Control Cost calculator, set hours requiring active humidity control to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.