condensation-margin psychrometric card · index card with a stamped header

Compare a Surface Scenario with an Explicit Over-Water Dewpoint Approximation

Room humidity and a cold surface are separate measurements. Keep the air inputs, estimated dewpoint and surface scenario together instead of turning one RH percentage into a building verdict.

1 · Air-sample code | air temperature Celsius | relative humidity percent

FIRST-LOAD

HYPOTHESIS / PROTOTYPE — checkout unavailable. Calculation is local. A draft is saved automatically in this browser profile when storage is available; Reset to sample clears it. Optional Pro history stores only five summaries and has its own deletion control. State links encode your inputs and can remain in browser history, clipboard or recipients’ records; share only non-sensitive rows. Optional external AI formatting leaves this device. The required site analytics beacon reports page activity; shared URLs contain encoded inputs. Do not treat an encoded URL as private. The calculator has no input-collection endpoint.

Data note: This condensation-margin psychrometric card calculates in the tab from Air-sample code | air temperature Celsius | relative humidity percent. No input-collection endpoint, AI request or file upload is built into it. Drafts may be saved locally; explicit input-state links and optional external formatting can disclose the records. Use non-sensitive codes and clear the draft when finished.

Perspective: Before: one humidity percentage seemed to decide a damp-room story. After: paired air observations, a separate surface scenario and an explicit approximation define a limited temperature margin.

2 · Read the condensation-margin psychrometric card

Bounded over-water approximation only: no mold, health, condensation, frost or building-safety diagnosis and no repair prescription. Verify measurements and actual moisture concerns with a qualified building professional; take health concerns to a qualified clinician.

Paid layer: condensation-margin psychrometric card filing layer

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one full, unwatermarked condensation-margin psychrometric card App execution
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What $4 one-time adds

subsequent condensation-margin psychrometric card App calculations through a browser-local convenience signal
boundary-preserving print and row-and-summary CSV of this condensation-margin psychrometric card; conditional retyping budget uses only your entered minutes
five local headline/count/time summaries, separately deletable; full-input draft is separate and not a backup

HYPOTHESIS / PROTOTYPE: the proposed $4 one-time price concerns filing this condensation-margin psychrometric card, not obtaining its answer. No checkout is available. An optional manual-retyping baseline computes a conditional one-export retyping budget; preparation, review, measured savings and buyer demand are not implied.

Local history (this device)

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Filing prototype — checkout unavailable

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Optional filing controls are a local prototype.

Checkout is unavailable. The reading above is complete; print, CSV and five local summaries are optional enhancements, not hidden answers.

Before using the condensation-margin psychrometric card

Use measured or explicitly hypothetical indoor air inputs and one clearly stated surface-temperature scenario. This approximation accepts air from 0 through 50 °C and RH from 0.1 through 100 percent; it is deliberately bounded and over water, not a universal meteorological model. The surface setting can range from −20 through 50 °C, but negative surfaces do not turn this into a frost prediction. The app has no sensor, weather feed, thermal camera or building inspection. A positive margin cannot rule out local condensation, mold, leakage or an unsafe room, and a negative margin does not prove those conditions occurred. Actual damp or health concerns need qualified investigation.

Boundary and sources

Declared local method: Let a = 7.5 ln(10), b = 237.3 °C, T be entered air temperature and h be RH divided by 100. Compute g = ln(h) + aT/(b+T), then estimated dewpoint Td = bg/(a−g). Margin is surface minus Td. The headline is the smallest row margin; row signs stay visible. A margin at or below zero receives an arithmetic review mark. The formula and coefficients are disclosed so another implementation can check the same convention rather than an unstated physical standard.
Every sample code, measurement, date, price, fingerprint and scenario is invented. Artifact checks do not verify reader data, policies, actual files, tickets, votes or health/accessibility outcomes.
National Weather Service RH/dewpoint calculator and its linked formula notes, fetched 2026-10-01, describe the humidity/dewpoint relationship. This local card states its own bounded over-water coefficients and does not calculate wet-bulb temperature, station pressure or an inspection outcome.
Google’s official Gemini pricing page, fetched 2026-10-01, lists AI Studio access in its Free section, limited model access and free input/output tokens. Free-tier content may be used to improve products. Optional external formatting may require an account; limits/access can change. Manual local entry needs none. Do not send sensitive records.

Mechanism: competence-autonomy-loop

Optional AI formatting, never the calculation

Manual entry completes this condensation-margin psychrometric card for free without signup. If available to you, the free AI Studio interface linked in the sources may format fictional or non-sensitive notes; external access may require an account. No API key or AI call is built into this tool. Free-tier content may be used to improve products. Review each cell and transcribe it to the labeled row schema; do not paste the JSON object into the row box.

Format only these fictional or non-sensitive notes for a condensation-margin psychrometric card. Return strict JSON shaped as {"rows": [{"label": "string", "cells": ["string", "string"]}], "setting": "string"}. The columns are Air-sample code | air temperature Celsius | relative humidity percent; the setting is Scenario surface temperature (°C). Keep all supplied strings and quantities exactly; do not calculate, infer missing entries, invent dates or add advice. If any required value is missing, return an empty rows array and ask me for it separately. I will verify every cell against my source and manually transcribe rows using vertical bars before running the local calculator.

An AI response is not executed, fetched or trusted as a result. Missing values remain questions; the strict local parser checks the rows you actually enter.