How to read the result
The Indoor Comfort Score is a quick room check, not a verdict on the whole home. A high score means the temperature, relative humidity, and dew point are sitting near a range many people find comfortable for everyday indoor rooms. A lower score points to the part of the room condition most likely to be felt: heat, chill, dry air, sticky air, or moisture that lingers near cooler surfaces.
Use the score when a room feels off but the thermostat alone does not explain it. A bedroom can be 72 F and still feel clammy if the dew point is high. A basement can feel cool and still smell damp if humidity stays elevated. The number does not prove that a room is healthy, dry inside the walls, or properly designed. It is a practical signal for what to measure next. If humidity is the main issue, compare this page with the Indoor Humidity Comfort Calculator. If condensation or damp corners are the concern, check the Room Moisture Watch Calculator.
Formula or method
The Indoor Comfort Score is an IndoorComfortKit heuristic that combines room temperature, relative humidity, and dew point. It is not a standard health index, building index, or HVAC design index. It starts from a practical target around 23 C, 45% relative humidity, and a dew point below about 16 C. It subtracts points as the room moves away from those conditions. Temperature has a steady penalty in either direction, relative humidity is compared with a middle comfort point, and dew point adds a stronger penalty once the air contains enough moisture to feel sticky or condense on cool surfaces.
This is an estimate. It does not use clothing level, activity level, radiant heat from windows, air speed, personal preference, or the temperature of wall and window surfaces. Those details matter. A sunny home office can feel warmer than the air reading because the desk, monitor, and window area radiate heat. A bedroom at night can feel cooler because air movement and bedding change how the same temperature feels. Treat the score as a triage tool: it points you toward a likely cause, then you confirm with room observations.
Room examples
A bedroom at night may score well at 21 to 23 C and 40 to 55% humidity, but fall if humidity climbs after a closed-door evening. If the air feels heavy when you wake up, compare the room humidity with the hallway and look at the dew point using the Dew Point Calculator for Indoor Rooms.
A bathroom after shower can drop sharply even if the room is warm. Steam raises relative humidity and dew point, and the score should be read as a temporary moisture event. The question is whether the room recovers after the fan runs and the door is left open.
A basement may look comfortable by temperature alone because it is cool, but the score can fall when humidity remains high. That is a cue to check storage corners, exterior wall closets, and cold floor areas, then review when a room needs a dehumidifier.
A sunny home office may score lower in the afternoon because heat gain pulls temperature away from the comfort center. If humidity is normal, shade, air movement, or AC sizing may matter more than moisture control.
What to try first
Start with measurement. Put the hygrometer in the room for at least 20 minutes, away from vents, windows, and electronics that run hot. Recheck after the room has been used in its normal way.
Compare rooms. A single high reading matters less than a pattern. If one room is always more humid than nearby rooms, look for closed doors, blocked returns, damp storage, or an exterior wall with poor air movement.
Use behavior changes before buying equipment. Run bath and kitchen fans during moisture-heavy tasks and for a short period afterward. Open interior doors when privacy is not needed. Move large furniture a few inches from cold exterior walls.
Control sun and internal heat. Close shades before direct sun hits the room. Turn off unused electronics. Use a small fan to mix air if the room has warm and cool pockets.
If humidity stays high, consider equipment sizing rather than guessing. The Dehumidifier Size Calculator can help estimate a starting range, and the AC BTU Room Size Calculator can show when cooling capacity may be mismatched.
Sources and limits
Sources used for this page include the EPA mold and moisture guide, which is useful for basic U.S.-oriented moisture prevention context, especially the idea that moisture control matters in ordinary homes. Local climate, building practices, ventilation norms, and appliance labels vary, so use the score as a household note rather than a regional standard.
The score is not medical advice, building inspection advice, HVAC engineering advice, or safety certification. It cannot identify hidden mold, gas hazards, electrical issues, structural moisture, or code compliance. If there is standing water, repeated leaks, damaged materials, unexplained symptoms, or a safety concern, use the calculator only as a note-taking aid and contact the appropriate qualified professional.
Sources and method notes
Last reviewed: 2026-06-14