Qanday qilib qozonxonamning xarajat samaradorligini hisoblashim mumkin? Qozonxonamning "uncha samarali emasligi" nimani anglatadi? Turli isitish tizimlarining energiya samaradorligini qanday baholayman? Agar kerak bo'lsa, uyimning kvadrat metrini hisoblashim mumkin.
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