IndoorComfortKit

Indoor comfort calculators

Start with the readings you have. Open the sections below for other room checks.

Have a meter reading?

Use your own inputs. These tools do not measure the room.

No reading yet? Check meter placement.

Is the air outside drier?

Compare indoor and outdoor temperature and humidity together.

Compare indoor and outdoor moisture

Cold windows or dry air?2 tools

Check the condensation limit before planning added moisture. These estimates disclose their assumptions.

  • Window Condensation Calculator: Surface and RH

    Compare a measured window surface or a simplified U-factor scenario with indoor humidity. Understand the threshold and why colder edges can get wet sooner.

  • Humidifier Size Calculator

    Estimate winter moisture replacement in gallons and liters per day. Compare air-change assumptions and check window condensation first.

More room indicators2 tools

Site-defined comfort and moisture watch signals from the same temperature and humidity inputs. These are not health or safety ratings.

  • Room Comfort Calculator: Temperature and Humidity Score

    Calculate a site-defined room comfort score from temperature and humidity. Compare the temperature–RH chart and see what the score leaves out.

    Needs: room temperature and relative humidity.

  • Room Moisture Watch Calculator

    Use humidity and dew point to flag room moisture conditions where dampness may linger around windows, walls, closets, or basements.

    Needs: room temperature and relative humidity.

Compare equipment sizes2 tools

Small-room planning estimates before comparing product labels and the conditions in the actual room.

  • AC BTU Calculator: Adjust for Your Room

    Enter room area, sun exposure, occupants and kitchen use to calculate adjusted AC BTU. Review the ENERGY STAR baseline and the 8-foot ceiling assumption.

    Needs: room area, ceiling height, sun, occupants, and kitchen heat.

  • Dehumidifier Size Calculator: Pints for Your Room

    Enter area and typical dampness to get a dehumidifier capacity range. See how RH boundaries, connected rooms and operating conditions affect the result.

    Needs: room area and dampness level, or an optional measured RH.

Before using these calculators

Place the hygrometer away from vents, direct sun, damp towels, and exterior glass. Let it settle before reading, then repeat measurements in the same location when a pattern matters.

These calculators work best when you use measured room data instead of guesses. For repeated problems, compare the same room over several days and check nearby rooms before buying equipment.

Calculator results are planning estimates. They do not inspect hidden materials, approve equipment, or replace medical, HVAC, electrical, building, or safety guidance.