Ключевые слова: background, banknote, bill, bills, business, cash, charge, cold, comfort, concept, control, cost, credit, crisis, currency, domestic, economy, efficiency, efficiency business, efficiency concept, electric, energy, energy efficiency, energy saving, equipment, euro, expensive, finance, financial, gas, global, hand, heat, heater, home, hot, investment, money, power, radiator, savings, thermal, thermal energy, white,