Ключевые слова: background, battery, bills, business, buying, cash, charge, concept, conceptual, cost, credit, crisis, currency, current, debt, dollar, economy, energy, expense, expensive, finance, financial, grey, heat, hot, increases, loss, money, object, one, pay, payment, pipe, power, pressure, price, public, radiator, regulator, save, saving, season, tax, technology, temperature, thermal utility, warm, white, winter,