June 14th 2023

Compliance with the Massachusetts Energy Code

Compliance with the Massachusetts Energy Code

The State of Massachusetts is taking significant steps to promote energy efficiency and sustainability in its buildings. The Massachusetts Energy Code, which took effect on July 1st, 2023, combines the IECC 2021 (International Energy Conservation Code) with an updated Stretch Code. The updated Stretch Code includes new code pathways for new commercial & residential construction projects. These compliance paths provide different options for meeting the energy efficiency requirements, including: 

  • Prescriptive (only for buildings under 20,000 ft2) 
  • Relative Performance (with ASHRAE 90.1-2019 Appendix G) 
  • Passive House, and HERS Rating (for multi-family) 
  • Thermal Energy Demand Intensity (TEDI)

The TEDI metric for building performance considers the equipment heating output for space and ventilation conditioning per unit of modeled floor area (Energy/Area).  TEDI is reported in kBtu/ft2-year (or kWh/m2-year). Since this metric does not account for the performance efficiencies of the systems, this approach has been deemed non-holistic by building performance professionals and is preferred by envelope consultants.  

Heating TEDI can be calculated from following equation:

Cooling TEDI can be determined as the ratio of the annual energy extracted from the spaces within the building and ventilation systems to maintain the thermostat setpoints to the modeled floor area. To calculate TEDI in IESVE Software, the user needs to create a custom variable in VistaPro that is the room units load and the coils divided by the modeled floor area (link here for tutorial). The State of Massachusetts provides the TEDI limits in table C407.1.2.3, replicated below. 

Table C407.1.2.3 Thermal Energy Demand Intensity (TEDI) Limits

Use Type

Heating TEDI (kBtu/sf- yr)

Cooling TEDI (kBtu/sf-yr)

Office, court house, fire station, library, police station, post office, town hall >= 100,000-sf 1.5 23
Office, court house, fire station, library, police station, post office, town hall < 100,000-sf 2.5 21
K-12 School >= 100,000-sf 2.2 12
K-12 School < 100,000-sf 2.4 20
Residential multifamily and dormitory >= 100,000-sf 2.8 22
Residential multifamily and dormitory < 100,000-sf 3.2 15
All other >= 100,000-sf 1.5 23
All other < 100,000-sf 2.5 21

IESVE Software can help communities in Massachusetts to strive for lower greenhouse gas (GHG) and energy code compliance goals, either with the TEDI metric or ASHRAE 90.1-2019’s metric: Performance Cost Index (PCI). With a range of Model Geometry options in IESVE Software, preparing a building performance model for TEDI or compliance analysis is straightforward.

Buildings alone contribute to ~75% of the emissions in the City of Boston. The range of decarbonization measures available in IESVE Software can help to quantify and mitigate GHG limits in the State of Massachusetts. Some simulation measures include solar thermal pre-heating, daylight harvesting, solar PV, energy storage, energy recovery ventilation and heat pump water heating.

IESVE Software continuously maintains decarbonization technologies for building designers and includes hourly grid CO2 emission factors and Central Plant Heat Pumps.