In certain geographic areas, especially away from the cities there are usually no choice of heating energy source . In addition, the same house, depending on the location will need different amounts of energy (up to several hundred percent) .
Katika baadhi ya maeneo ya kijiografia, hasa mbali na miji huko ni karibu na uchaguzi wa kukanza chanzo cha nishati . Aidha, katika nyumba moja, kutegemea na eneo na eneo atahitaji kiasi tofauti ya nishati (hadi asilimia mia kadhaa) .