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  • High HVAC natural gas bills,

  • High HVAC electricity bill,

  • Costly carbon levy [high CO2e emissions],

  • Costly Domestic Hot Water [DHW] production,

  • Failing/reduced building heating and DHW capacity,

  • Outdated inefficient  HVAC system with costly operation,

  • Low energy-efficiency performance [including modern HVAC system and ZCB certified Bldgs.],

  • Expensive technologies for arbon emissions offsetting [Bldg. toward ZCB certification],

  • Oversize design of heating & cooling HVAC systems,

  • Thermal bottle-necking on processes lines.

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