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Outdated inefficient  HVAC system with costly operation,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.