Understand where heating and cooling costs originate
Separate the building’s thermal demand from the energy needed to serve it. Weather, glazing, occupancy, equipment and ventilation create loads; plant efficiency and distribution determine the energy consumed. Offices with low occupancy and hotels with continuous service needs require different strategies. Review utility profiles alongside comfort complaints and maintenance records to identify whether the priority is reducing demand, improving plant performance or correcting operation.
Check airflow and ventilation against the application
Blocked filters, dirty coils, poor balancing and faulty dampers can undermine performance. Confirm that outside-air and exhaust operation reflect the building’s use and applicable ventilation requirements. Demand-responsive ventilation may be suitable in some spaces, but sensors, controls and commissioning must support it. Do not reduce ventilation solely to lower bills. Public buildings, kitchens and specialist spaces can have requirements that override general occupancy-based assumptions.
Improve plant and distribution together
Review chiller and boiler loading, heat-pump operating temperatures, pump control and distribution losses. Low temperature differences across a chilled-water system may point to excess flow or terminal-unit problems, but the cause needs investigation. Check insulation and hydraulic performance before changing setpoints. Variable-speed drives and temperature resets can create opportunities where systems permit them; applying them without equipment and load checks can introduce faults rather than savings.
Evaluate heat recovery and replacement in context
Useful heat recovery requires simultaneous demand at a suitable temperature. Hotels may offer hot-water loads that differ from seasonal office heating, while mixed-use buildings can present overlapping demands. Compare recoverable heat with the cost and performance of the existing heat source. When replacement is necessary, use measured demand and corrected operating conditions to inform sizing, and consider electrical capacity, noise, space, maintenance and service continuity.
Confirm energy, cost and comfort outcomes
Prioritise measures with a documented baseline, investment estimate and verification method. Compare post-change consumption under similar weather and occupancy, while tracking indoor conditions and complaints. Assess interacting measures as a package rather than adding independent estimates. A successful HVAC improvement reduces avoidable energy use while maintaining the required environment; lower expenditure alone does not prove improved efficiency if tariffs or operating hours also changed.
Reference & further reading
Official technical resource. Confirm applicability to your facility and engagement.
Related insights
What a commercial energy audit should deliver