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A display can help people understand what is happening before panic or confusion spreads through a shared household.

The Quebec access framework matters in duplexes, triplexes, and rentals where a shared front entrance and a private unit door are not the same operational problem.

A rebate can push the household toward the wrong setup if the real problem is room comfort, not deal availability.

Use the N/S/E/W orientation effects on light, temperature, and comfort. Apply to Montreal street-facing vs courtyard-facing room setup decisions. Ignore app promotion.