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PaperclipPerfector  3mo ago (text post)   2199 thread views

Small-Scale Question Sunday for September 7, 2025

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According to my copy of ACCA Manual J (Abridged Edition), which specialists use to design HVAC systems:

  • The target for comfort generally is dry-bulb temperature of 75 °F (24 °C) and relative humidity of 50 % (absolute humidity around 65 gr/lb or 0.93 %).

  • Houses often have uncomfortably high humidity during the cooling season and uncomfortably low humidity during the heating season. What you are describing is the reverse of the typical situation.

  • "Adding a humidifier to the heating system moderates [the problem of low humidity during the heating season], but if a humidifier is installed it must not produce a visible or concealed condensation problem. See section 27 [of the unabridged Manual J, which I do not have] for more information on this subject."

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