主题： indoor-climate
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Two consumer hygrometers in one room disagree less on dew point than on relative humidity
Hypothesis: two consumer temperature-humidity devices placed at different spots in one room report relative humidity values that differ mainly because their temperatures differ, so the dew points computed from each device's own pair agree more closely than the raw RH readings once the fixed inter-device offset is removed; no measurement is reported.
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A heating-season log: heating input, indoor temperature and degree days on one timeline
A proposed protocol for one heating season: read the household's heating input (a heat, gas or electricity meter or thermostat runtime) at a fixed time, log indoor temperature and setpoint changes beside it, derive heating degree days from logged daily highs and lows with a stated base, and keep a conditions column so that a month's consumption can be checked against weather and events; no target temperature or saving is asserted.
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Logging a consumer PM2.5 sensor: what to record beside each reading and what the number cannot say
A consumer particulate sensor reports an estimate of the mass of particles 2.5 micrometres and smaller; the EPA states that such sensors come with lower accuracy and higher uncertainty than regulatory monitors, describes collocation with reference instruments as an effective way to assess them, and notes that an outdoor correction may not apply indoors and that changing temperature and humidity may affect some sensors. A household log therefore stores the raw value, the averaging interval, placement, indoor events and the nearest official monitor's value with its distance.
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A window and door draught observation log with a tissue strip: numbered points, a three-level movement scale and an outdoor wind note
A proposed record-only protocol for observing air movement at window and door edges with a hanging strip of thin tissue paper rather than a flame or smoke: numbered observation points per opening, a fixed hold distance and duration, a three-level movement scale defined in the header, and an outdoor wind estimate using the Beaufort land descriptions as the National Weather Service lists them; no sealing, insulation or energy advice is given.
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Indoor line-drying time tracks the gap between room temperature and dew point more closely than relative humidity alone
Hypothesis: the National Weather Service describes the dew point as the temperature to which air must be cooled to reach 100 % relative humidity and notes that relative humidity can be misleading because the same figure means different moisture at different temperatures; the proposal is that, for similar wet loads weighed at intervals on the same indoor rack, the time to a stable mass is ordered better across days by the difference between room temperature and dew point than by relative humidity, in a within-household comparison; no result is claimed.
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Logging indoor temperature and relative humidity: a placement and reading protocol
A proposed protocol for a room log: fix each sensor's position and height, record temperature and relative humidity as a pair with time and the window and heating state, and treat relative humidity as temperature-dependent when comparing rooms or days; no comfort, mould or health threshold is asserted.
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A condensation and surface-spot observation log: fixed positions, a fixed morning time, a photo with a grid, and the dew point beside each entry
A proposed record-only protocol for logging window condensation and dark surface spots at numbered positions at one fixed morning time, with indoor temperature, humidity and dew point, outdoor temperature, the previous evening's ventilation and moisture events, and a photograph against a grid per position; the NWS explanation that cooling air below its dew point makes water vapour leave it as liquid and the EPA statement that condensation can be a sign of high humidity are the context, and no identification of the spots, health or remediation guidance is given.
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