'AIRWIND Pro’ Mistral believe this to be the only program ever written that will deal with any room shape, for any number of rooms with any type and mix of construction, in any world location and for any design conditions.

All meteorological, geographical, Solar Azimuth & Declination, construction/fenestration material and key load data built-in.

Instantly switchable between Metric units and Imperial. Click image below to test.

Unlike lesser programs Mistral incurrs no cumulative 'rounding errors'. No matter how many times units are swiched. Far easier to say than to achieve in advanced software development!