FÉLINSCOPE · PRACTICAL WORKSHEET · V1.0
By André Ribeiro · 12 October 2026
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A household planning aid, not an air-quality audit, medical test or product recommendation.
Currency: _______ Electricity tariff per kWh: _______
Purifier: _______ watts × _______ hours/day × 365 ÷ 1,000 = _______ kWh/year.
Vacuum: _______ wall-input watts × _______ minutes/week ÷ 60 × 52 ÷ 1,000 = _______ kWh/year.
For each device: kWh × tariff + annual bags/filters = estimated annual running cost.
Purifier annual consumables: _______ Vacuum annual consumables: _______
Use one currency. Blank means unknown, not zero. Cordless vacuum inputs must describe charging power and charging time. Excludes purchase prices, repairs, standing charges and unrecorded standby use. Different spending does not imply equivalent performance.