The residential Studio sizes a PCM module kit for homes and individual rooms. Commercial and public-building work now runs in its own project workspace with separate authorization and reports.
Step 01 — Climate
Where is the room?
Choose a country on the map, then refine by city.
Supported cities
P90 climate fit: Conditional fit
10.0 night hours in London fall below a 24°C PCM phase point; 6 hours are required for recharge.
Step 03 — Your room
This Studio is only for homes and individual rooms. Commercial projects now use a separate calculation workspace.
Open commercial workspaceCan a window open at night?
This changes transmission, solar and internal heat gains — not just floor area.
Step 04 — Supplemental cooling
Studio sizes passive measures and PCM first. Only after that quantity is fixed does it add the minimum active control needed for the remaining comfort gap.
Baseline case: no active room-cooling capacity is credited.
Model credit: 0 W room heat removal. PCM quantity is not reduced.
Step 05 — What do you already own?
Anything you own is marked “Reuse yours”. The rest gets “Partner pick” — never a forced bundle.
PCM quantity, fan quantity, price and comfort results appear only after this calculation.
Step 02 — Thermal screening
Public calculation basis
One public model is used for every PCM quantity. It represents roughly the hottest 10% of warm-season days and is a decision estimate, not a performance guarantee.
Extreme multi-day heatwaves can prevent overnight PCM regeneration; active cooling is the correct fallback in that condition.
Complete the building information below, then calculate. PCM usage is hidden until that step.
Day and night speeds are controlled separately. Boost automatically returns to a lower mode after 2 hours.
Results wait for your inputs
The PCM module quantity, fan quantity, price, comfort curve and any compressor portable-AC recommendation will appear together after you click the calculation button.