Psychrometric chart
Every hour of the site's typical year is plotted by temperature and humidity, so the dominant conditions a building has to deal with are visible at a glance. The hourly temperature analysis also compares the site against an ASHRAE-55 adaptive comfort band.
Passive design strategies for indoor environments
Projects on a paid plan add strategy zones to the chart and the share of hours each one covers:
- Comfort range
- Use of fans
- Thermal mass with night ventilation
- Capture of internal heat
- Passive solar heating
See your site's climate before design begins
Pin any location and get climate, comfort and preliminary energy insight your whole team can read. Start with a 7-day free trial, or book a 30-minute demo.
Frequently asked questions
What is a psychrometric chart used for in architecture?
It plots air temperature against humidity. Overlaying the hours of a climate on it shows how often conditions are comfortable and which passive strategies could extend comfort without mechanical systems.
Which passive strategies does C4B evaluate?
Comfort range, use of fans, thermal mass with night ventilation, capture of internal heat and passive solar heating, each with the share of the year's hours it covers.
Is this available on the Free plan?
The psychrometric chart is available on the Free plan with weather-station data. The passive design strategies are part of design direction in projects on paid plans.
Learn the concepts
Psychrometric chart for architects
The axes and curves of the psychrometric chart, where comfort zones sit on it, and how to read a climate's hours for passive design.
Passive design strategies by climate
How bioclimatic charts link ventilation, thermal mass, evaporative cooling, internal gains and passive solar heating to the climates where they work.
Adaptive thermal comfort
ASHRAE 55 and EN 16798-1 adaptive comfort: when the method applies, the equations and limits, and how to use them in naturally ventilated design.
Climate-responsive design
The principles of climate-responsive design, and the strategies that suit hot-dry, hot-humid, temperate and cold climates, grounded in building science sources.
Related features
Köppen climate zone
Köppen-Geiger and ASHRAE 169 climate zones for any site, with a Köppen-Geiger map from 1901 to 2100 under five climate scenarios.
Preliminary energy analysis
An hourly preliminary energy balance and orientation and aspect-ratio optimization for early design.
Outdoor comfort (UTCI)
UTCI outdoor thermal comfort heatmaps by season and hour, and strategies for sun and wind exposure.