How to find which part of HVAC should be retrofitted

How to find which part of HVAC should be retrofitted
©stanciuc , #86087764, 2018, source:
Wholesale and retail
Medium cost
Resource savings: Energy:
In the case of retailers, where the use of energy is usually governed by the refrigeration and lighting needs, great savings can still be achieved if the demand is controlled by the occupancy. If the store's heating and ventilation devices only respond on demand, 10-20 % of its energy use can be saved.
Associated cost savings: Energy:
10 - 20%
Premises and operation areas:
Supply operations
Size of company:
Micro (less than 10), Small (less than 50), Medium (less than 250), Large (more than 250)
Advancement in applying resource efficiency measures:
What is in it for you:
Energy savings. Customer comfort.
Descriptive information:

Diagnosis of a building can help designers and architects to decide which aspects should be retrofitted in order to improve the energy efficiency of the heating, ventilation and air-conditioning (HVAC) system.

The most important aspects to watch out for and recommended actions are:

  • Duct leakage and seal ducts: aeroseal/tape/mastic
  • Duct insulation: add insulation to ducts
  • Air flows at registers: replace registers, open/close dampers, reduce system flow resistance by straightening existing ducts or replacing them with straight runs of new ducts
  • Low air handler flow: replace filters, fix duct restrictions, change fan speed, replace fan with a high-efficiency unit, add extra returns in return-restricted systems
  • Bad filter condition: replace filter
  • Thermostat setting: raise thermostat in summer and lower it in winter to account for better distribution, mixing and envelope improvements
  • Spot ventilation: replace fans if necessary; if possible, remove spot ventilation and use ducts and central ventilation
  • High power consumption in spot ventilation: install a higher efficiency unit, remove/reduce duct flow restrictions, clean fan and ducting
  • Equipment capacity: replace with the correct size
  • Refrigerant charge: add/remove refrigerant
  • Age and condition of HVAC system: clean the system and repair damage or replace the system if greater than 15 years old
  • Location of HVAC system equipment and ducts: seal and insulate duct locations; if applicable, move system location
  • Window A/C units: replace with central unit or improved distribution
  • Multiple systems/zoning: ensure correct damper operation, check the capacity of each system/zone load calculation
  • Moisture testing: improve source control; better venting in sensitive zones, fix flashing/detailing, seal crawlspaces in high humidity climates, replace windows, add insulation to walls, floors, and ceiling
  • Occupant survey: asking customers to report problems; create moisture removal strategies; install new windows, change register type, airflow and location to improve mixing/remove drafts, add envelope insulation, etc.

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