CS84 Energy Code Feasibility Study in Amesbury, Massachusetts

Exterior Walls

≥ R-21 cavity insulation (2x6 @ 16" o.c.) with ≥ R-12.6 continuous exterior insulation.

≥ R-21 cavity insulation (2x6 @ 16" o.c.) with ≥ R-6 continuous exterior insulation.

Slab

≥ R-10 insulation under the entire slab; provides a full thermal break.

≥ R-10 perimeter insulation, 2 ft deep, at the interior face of the slab edge, plus ≥ R-10 under-slab insulation, 2 ft wide; provides a full thermal break.

Rim Joists

≥ R-34 rim/band insulation at floor transitions.

≥ R-21 rim/band insulation at floor transitions.

Roof

Vented attic: ≥ R-60 insulation.

R-49 cavity insulation.

Windows & Glass Doors

High performance, U ≤ 0.18 / SHGC ≤ 0.18.

High performance, U ≤ 0.27 / SHGC ≤ 0.30.

Air Sealing

≤ 0.30 CFM50 per sqft of enclosure (compartmentalization); tested.
Whole-building blower door: ≤ 0.06 CFM50 per sqft of enclosure.

≤ 0.27 CFM50 per sqft of enclosure (compartmentalization); tested.

HVAC

Ducted air-source heat pump (as modeled); SEER2 ≥ 17.5; HSPF2 ≥ 10. See HVAC Design Loads.

Ducted or ductless air-source heat pump, SEER2 17.5 / HSPF2 9.5
1BR: 18 kBtuh
2BR: 24 kBtuh
3BR: 30 kBtuh
Sized to the worst-case design load per bedroom count, see HVAC Design Loads
Ducted and ductless systems both satisfy this spec
If a ducted system is used, every duct must be in conditioned space

Ductwork

Supply and return ducts in conditioned space insulated to code minimum.

Ducted or ductless. If ducted: all supply and return ducts in conditioned space at every level (including top-floor units), insulated to code minimum. Ducts shall not be located in unconditioned attics or other unconditioned space.

Mechanical Ventilation

In-unit ERV, ≥ 82% ASRE

In-unit ERV, ≥ 87% ASRE

DHW

1-Bedroom: Heat pump water heater (HPWH) (as modeled); UEF ≥ 3.8; 40 gal
2-Bedroom: Heat pump water heater (HPWH) (as modeled); UEF ≥ 3.8; 50 gal
3-Bedroom: Heat pump water heater (HPWH) (as modeled); UEF ≥ 3.8; 65 gal

Studio / 1-bedroom: In-unit all-in-one heat pump water heater (HPWH); UEF 3.8; 40 gal
2-bedroom: In-unit all-in-one heat pump water heater (HPWH); UEF 3.8; 50 gal
3-bedroom: In-unit all-in-one heat pump water heater (HPWH); UEF 3.8; 65 gal

Clothes Dryer

Heat pump dryer; ventless; CEF ≥ 6.

ENERGY STAR electric dryer; vented; CEF 3.93.

Stove / Oven

Electric induction cooktop; convection oven.

Electric range.

Cost $/sf

$52.04

$46.46

Incentive $/sf

$3.76

$2.27

Net $/sf

$48.94

$44.73

1-Bedroom

2.6

0.0

4.7

2.4

3.8

1.5

15.1 @ 1°F

15.1 @ 1°F

2-Bedroom

2.1

0.0

4.8

4.6

5.7

1.9

19.1 @ 1°F

19.1 @ 1°F

3-Bedroom

4.1

0.0

4.6

5.4

7.0

1.9

23.0 @ 1°F

23.0 @ 1°F

1-Bedroom

0.4

1.3

2.1

2.1

3.0

8.8

0.66

2-Bedroom

2.6

2.1

2.3

2.3

3.5

12.8

0.73

3-Bedroom

2.9

2.1

2.5

2.6

4.0

14.0

0.71

1-Bedroom

7.9 to 20.0 kBtuh rated

≥ 15.1 kBtuh @ 1°F

2-Bedroom

11.5 to 20.0 kBtuh rated

≥ 19.1 kBtuh @ 1°F

3-Bedroom

12.6 to 20.0 kBtuh rated

≥ 23.0 kBtuh @ 1°F

Climate zone

IECC 5A (2012 IECC map)

Program

ENERGY STAR MFNC National v1.1 Rev. 05

Rule

Design Review Item 2.1 / Fn 11-12; Proposed UA ≤ Reference UA

Code reference

Exhibit 1 Table 1 (2012 IECC CZ); Design Review Item 2.1 / Fn 11-12

Version basis

code minimum (Exhibit 1, MA permit today)

Note

Reference wall U uses Design Review Checklist Rev. 05 footnote 12.i: Group R wood-framed walls, when the Total UA references the 2009 IECC commercial chapter, may use U-0.089 in Climate Zone 4 and U-0.064 in Climate Zone 5 and Marine 4 instead of the printed U-0.064 and U-0.051.

Walls

≥ R-21 cavity insulation (2x6 @ 16" o.c.) with ≥ R-6 continuous exterior insulation.

Roof

Vented attic: ≥ R-49 insulation.

Windows

High performance, U ≤ 0.27 / SHGC ≤ 0.30.

Doors

Opaque door, U ≤ 0.20 (R-5.0).

Slab

≥ R-10 perimeter insulation, 2 ft deep, at the interior face of the slab edge, plus ≥ R-10 under-slab insulation, 2 ft wide; provides a full thermal break.

Corridor2

40,326

19,778

10,294

n/a

3,989

ManorA1

20,288

4,737

2,244

n/a

2,776

ManorA4

5,022

4,737

604

n/a

0

ManorA5

16,003

7,895

1,828

n/a

1,388

ManorB1

15,752

0

1,760

n/a

2,864

ManorB2

1,674

1,579

202

n/a

0

ManorB5

7,876

0

880

n/a

1,432

TownFlatsA3

7,354

4,946

1,143

160

1,696

TownFlatsA4

11,031

7,419

1,714

240

2,544

TownFlatsA5

22,061

14,838

3,429

480

5,088

TownFlatsB1

8,640

6,706

1,378

200

1,872

TownFlatsC1

1,690

1,760

234

40

336

WalkupA1

14,320

4,448

2,502

n/a

2,883

WalkupA2

11,148

4,448

1,946

n/a

1,730

WalkupB1

7,135

3,908

1,225

n/a

481

WalkupB2

24,048

11,724

4,034

n/a

2,403

WalkupC1

13,122

6,736

2,186

n/a

961

Opaque exterior walls

227,490 sf

0.044

10,036

0.064

14,559

Roof / ceiling

105,659 sf

0.024

2,537

0.021

2,219

Windows & glass doors

37,604 sf

0.270

10,153

0.270

10,153

Slab edge (F x perimeter)

32,443 lf

0.540

17,519

0.540

17,519

Opaque doors

1,120 sf

0.200

224

0.170

190

Corridor2

7,187

7,930

90.6%

PASS

ManorA1

3,114

3,503

88.9%

PASS

ManorA4

499

584

85.3%

PASS

ManorA5

2,138

2,433

87.9%

PASS

ManorB1

2,717

3,030

89.7%

PASS

ManorB2

166

195

85.3%

PASS

ManorB5

1,358

1,515

89.7%

PASS

TownFlatsA3

1,700

1,826

93.1%

PASS

TownFlatsA4

2,549

2,739

93.1%

PASS

TownFlatsA5

5,099

5,478

93.1%

PASS

TownFlatsB1

1,965

2,111

93.1%

PASS

TownFlatsC1

370

397

93.2%

PASS

WalkupA1

2,971

3,242

91.6%

PASS

WalkupA2

2,058

2,267

90.8%

PASS

WalkupB1

999

1,129

88.5%

PASS

WalkupB2

3,729

4,172

89.4%

PASS

WalkupC1

1,850

2,091

88.5%

PASS

Site total

40,469

44,641

90.7%

PASS

Exterior Walls

≥ R-21 cavity insulation (2x6 @ 16" o.c.) with ≥ R-6 continuous exterior insulation. (Product Rec).

Below Grade Walls

N/A

Corridor Walls

N/A

Slab

≥ R-10 perimeter insulation, 2 ft deep, at the interior face of the slab edge, plus ≥ R-10 under-slab insulation, 2 ft wide; provides a full thermal break.

Floor Over Unconditioned Space

N/A

Floor Over Garage

N/A

Floor Over Podium

N/A

Rim Joists

≥ R-21 rim/band insulation at floor transitions.

Roof

R-49 cavity insulation.

Windows & Glass Doors

High performance, U ≤ 0.27 / SHGC ≤ 0.30. (Product Rec).

Doors

Opaque door, U ≤ 0.20 (R-5.0).

Air Sealing

≤ 0.27 CFM50 per sqft of enclosure (compartmentalization); tested. (Air Sealing Protocol)

HVAC

Ducted or ductless air-source heat pump, SEER2 17.5 / HSPF2 9.5 (Product Rec).
1BR: 18 kBtuh
2BR: 24 kBtuh
3BR: 30 kBtuh
Sized to the worst-case design load per bedroom count, see HVAC Design Loads
Ducted and ductless systems both satisfy this spec; if a ducted system is used, every duct must be in conditioned space

Ductwork

Ducted or ductless. If ducted: all supply and return ducts in conditioned space at every level (including top-floor units), insulated to code minimum. Ducts shall not be located in unconditioned attics or other unconditioned space.

Duct Sealing

≤ greater of 80 CFM25 or 8 CFM25 per 100 sqft of conditioned floor area; tested at final. (Duct Sealing Protocol)

HVAC Grading

N/A

Mechanical Ventilation

In-unit ERV (Product Rec).
1-bedroom: 65 CFM, ≥ 87% ASRE
2-bedroom: 65 CFM, ≥ 87% ASRE
3-bedroom: 65 CFM, ≥ 87% ASRE

Local Mechanical Exhaust

Bathroom(s): at least 50 CFM intermittent and up to 3.0 sones, or at least 20 CFM continuous and up to 2.0 sones.
Kitchen(s): at least 100 CFM intermittent and up to 3.0 sones, or continuous at 5 ACH.
Both: exhaust directly outdoors with ENERGY STAR certified fans. A balanced ERV or HRV serving the space may satisfy this requirement.

Thermostats

Programmable thermostat (as modeled).

DHW

Studio / 1-bedroom: In-unit all-in-one heat pump water heater (HPWH); UEF 3.8; 40 gal (Product Rec).
2-bedroom: In-unit all-in-one heat pump water heater (HPWH); UEF 3.8; 50 gal
3-bedroom: In-unit all-in-one heat pump water heater (HPWH); UEF 3.8; 65 gal

DHW Piping

Supply piping insulated to ≥ R-3.

Water Fixtures

WaterSense certified (Lavatory ≤ 1.2 GPM; Shower ≤ 2.0 GPM; Kitchen ≤ 2.2 GPM).

Refrigerator

1-Bedroom: ≤ 500 kWh/yr; electric (Product Rec).
2- and 3-bedroom: ≤ 600 kWh/yr; electric

Dishwasher

≤ 269 kWh/yr; electric. (Product Rec).

Clothes Washer

IMEF ≥ 2.06; IWF ≤ 11.4; ≤ 152 kWh/yr; ENERGY STAR; electric. (Product Rec).

Clothes Dryer

ENERGY STAR electric dryer; vented; CEF 3.93. (Product Rec).

Stove / Oven

Electric range. (Product Rec).

Lighting

≥ 100% high-efficacy (LED).

Solar Ready

Low-rise buildings (225 CMR 22 Appendix RB as amended): unobstructed rooftop solar-ready zone of at least 300 sf and at least 5 ft wide, with a conduit/plumbing pathway to the service panel, reserved dual-pole breaker space, structural loads shown on the construction documents, and a permanent certificate. High-rise buildings and the clubhouse (225 CMR 23 C402.3 → IECC Appendix CB): reserve and keep clear at least 40% of the qualifying roof area, with an interconnection pathway and conduit, reserved electrical service space and panel capacity, 5 psf collateral dead load in the structural design of the zone, construction documents, and a permanent certificate.

EV Ready

At least 20% of parking spaces wired EV-ready (40-amp Level II; shared circuits with load management allowed).

HPWH Ready

N/A

Paperwork & Modeling

HERS/ERI model and IECC 2021 checklist for the three-story buildings (ENERGY STAR checklists optional). HERS/ERI model, IECC 2021 checklist, and ENERGY STAR checklists for the four-story buildings. COMcheck for the clubhouse.

Testing & Verification

ENERGY STAR field verification: pre-drywall and final inspections, unit air-tightness (blower door), duct-leakage, ventilation and exhaust airflow, and HVAC functional testing.

Exterior Walls

≥ R-21 cavity insulation (2x6 @ 16" o.c.) with ≥ R-6 continuous exterior insulation.

Below Grade Walls

N/A

Corridor Walls

N/A

Slab

≥ R-10 perimeter insulation, 2 ft deep, at the interior face of the slab edge, plus ≥ R-10 under-slab insulation, 2 ft wide; provides a full thermal break.

Floor Over Unconditioned Space

N/A

Floor Over Garage

N/A

Floor Over Podium

N/A

Rim Joists

≥ R-21 rim/band insulation at floor transitions.

Roof

Sealed attic: R-49 cavity insulation.
No continuous insulation.

Windows & Glass Doors

Fixed U ≤ 0.30; operable U ≤ 0.30; SHGC ≤ 0.40.

Doors

Glazed entrance U ≤ 0.60; opaque U ≤ 0.37.

Air Sealing

Continuous air barrier for this space.
Grade I insulation installation.
Penetrations, rough openings, and electrical boxes sealed.
Unit-to-corridor doors gasketed.
Verified by inspection of the continuous air barrier.
225 CMR 22 R402.4
225 CMR 23 C402.5.1

HVAC

Ducted split heat pump: SEER2 15.2 and HSPF2 7.8.
Ductless heat pump: SEER2 16 and HSPF2 8.2.
225 CMR 23 C403.3.2
ENERGY STAR MFNC common-space HVAC

Ductwork

Distribute conditioned air to all occupied common spaces. Ducts and air-handler units located entirely within conditioned space. Design and test to standard duct-design and duct-leakage practice.

Duct Sealing

Per system, final test (at 25 Pa): 6 CFM per 100 sqft or 60 CFM (no return ducts)
8 CFM per 100 sqft or 80 CFM (1 to 2 return ducts)
12 CFM per 100 sqft or 120 CFM (3+ returns).
Rough-in: 3/30, 4/40, or 6/60. All ducts and AHU in conditioned space. Tested.

HVAC Grading

N/A

Mechanical Ventilation

Corridor: 0.06 cfm/sqft.
Airflow quantity band: the base design quantity, and 10 percent above that base.
Demand-controlled ventilation where a corridor exceeds 500 sqft and 25 people per 1,000 sqft.
Energy recovery where the system exceeds the non-dwelling threshold: 70 percent sensible and 60 percent enthalpy.
225 CMR 23 C403.7.4.2
ENERGY STAR MFNC common-space ventilation

Local Mechanical Exhaust

N/A

Thermostats

Programmable thermostat with a 5 F setback.
225 CMR 22 R403.4
225 CMR 23 C403.4

DHW

N/A

DHW Piping

N/A

Water Fixtures

N/A

Refrigerator

N/A

Dishwasher

N/A

Clothes Washer

N/A

Clothes Dryer

N/A

Stove / Oven

N/A

Lighting

100 percent high-efficacy LED.
Corridor: 0.41 W/sqft
Stair: 0.49 W/sqft
225 CMR 23 C405.3.2

Lighting Controls

Occupancy sensors. Corridors and stairs may dim to 50 percent.
Automatic time-switch shutoff.
Daylight controls where a zone exceeds 100 W in a primary sidelit zone, 300 W in a sidelit zone, or 100 W in a toplit zone.
225 CMR 23 C405.2

Solar Ready

Low-rise buildings: unobstructed rooftop solar-ready zone of at least 300 sf and at least 5 ft wide, with a conduit pathway to the service panel, reserved dual-pole breaker space, structural loads on the construction documents, and a permanent certificate.
225 CMR 22 Appendix RB
4-story buildings: reserve and keep clear at least 40 percent of the qualifying roof area, with an interconnection pathway and conduit, reserved electrical service space and panel capacity, 5 psf collateral dead load on the zone, construction documents, and a permanent certificate.
225 CMR 23 C402.3 and Appendix CB

EV Ready

At least 20 percent of parking spaces wired EV-ready (40-amp Level II; shared circuits with load management allowed).
225 CMR 23 C405.13
225 CMR 22 R404.4

HPWH Ready

N/A

Electric Readiness

N/A

Vestibules

Self-closing vestibule at public entrances of the 4-story buildings.
225 CMR 23 C402.5.8

Efficiency Credits

N/A

Paperwork & Modeling

HERS submittals at permit and certificate of occupancy.
4-story buildings: ENERGY STAR MFNC v1.2 workbook, checklists, and the common-space HVAC supplement.
225 CMR 22 R406
225 CMR 23 C407.4

Testing & Verification

Ventilation balanced to the airflow quantity band.
Duct leakage tested where ducts are installed.
Air barrier inspected.
Lighting controls tested.
225 CMR 22 R402.4
225 CMR 23 C408

Exterior Walls

Cavity R-21, continuous exterior insulation none.

Below Grade Walls

N/A

Slab

Unheated slab-on-grade: continuous perimeter insulation R-15, 4 ft vertical.

Floor Over Unconditioned Space

N/A

Roof

Continuous insulation none, cavity R-49.

Windows & Glass Doors

U ≤ 0.30 / SHGC 0.30

Doors

Opaque swinging doors U-0.37.
Nonswinging doors U-0.31.
IECC 2021 Table C402.1.4.

Air Sealing

Continuous air barrier.
Third-party whole-building air leakage test, not greater than 0.35 cfm/sf of thermal envelope at 75 Pa.
225 CMR 23 C402.5.2.

Thermal Bridging

Vertical envelope performance accounts for thermal bridges, including fastener derating of continuous insulation and linear bridges.
COMcheck is the approved calculation for this building.
225 CMR 23 C402.6 and C402.7.

HVAC

Electric cold-climate air-source heat pump, gymnasium
Heating 30 kBtu/h
Cooling 30 kBtu/h
16 SEER2 / 9 HSPF2
Electric cold-climate air-source heat pump, fitness and spin
Heating 36 kBtu/h
Cooling 36 kBtu/h
16 SEER2 / 9 HSPF2
Electric cold-climate air-source heat pump, yoga, restrooms, and support
Heating 24 kBtu/h
Cooling 24 kBtu/h
16 SEER2 / 9 HSPF2
Dedicated outdoor air heat pump with energy recovery
Heating 30 kBtu/h
Cooling 48 kBtu/h
6 EER / 3.6 COP

HVAC Sizing

N/A

Ductwork

Ducts and air handlers sealed.
Ducts in unconditioned space insulated to R-6.
Ducts outside the building insulated to R-12.
IECC 2021 C403.12.1.

Economizer

Economizer on the dedicated outdoor air system.
225 CMR 23 C403.5.

Mechanical Ventilation

Outdoor air to the gymnasium, fitness room, spin room, yoga room, restrooms, and corridor.
Dedicated outdoor air system with energy recovery.
Sensible energy recovery ratio not less than 70 percent at heating design.
Enthalpy recovery ratio not less than 60 percent at heating and cooling design.
225 CMR 23 C403.7.4.2.
IECC 2021 C403.2.2.

Thermostats & Controls

Individual thermostatic control in each zone.
Deadband not less than 5°F where one control does both heating and cooling.
Off-hour setback by automatic time clock or programmable control.
IECC 2021 C403.4.1 and C403.4.2.

DHW

Point-of-use electric tankless water heater, men's restroom.
Point-of-use electric tankless water heater, women's restroom.
Point-of-use electric tankless water heater, janitor's sink.
IECC 2021 C404.2.

DHW Piping

Piping from each point-of-use heater to the fixture insulated per Table C403.12.3.
IECC 2021 C404.4.

Water Fixtures

N/A

Interior Lighting

Allowed LPD
Gymnasium / open play: 0.94 W/sf
Fitness room (cardio/weights): 0.72 W/sf
Spin room: 0.72 W/sf
Yoga room: 0.72 W/sf
Restrooms (men / women): 0.63 W/sf
Corridor / lobby: 0.79 W/sf
Mechanical closet: 0.43 W/sf
Utility closet: 0.43 W/sf
Storage closets: 0.63 W/sf

Lighting Controls

Occupant sensors in the restrooms, storage closets, mechanical closet, and utility closet, turning lights off within 20 minutes.
Corridor and lobby lighting reduces to not more than 50 percent within 20 minutes after occupants leave.
Time-switch controls in the gymnasium, fitness room, spin room, and yoga room.
Daylight-responsive controls above 100 W in a primary sidelit zone or a toplit zone, and above 300 W in a sidelit zone.
IECC 2021 C405.2.1 and C405.2.2.
225 CMR 23 C405.2.4.

Exterior Lighting

Lighting zone Residential. Allowed LPD: 14 W per ft of door width.

Solar Ready

Rooftop solar readiness is required on this one-story building.
Reserve and keep clear at least 40 percent of the qualifying roof area as a solar-ready zone.
Provide an interconnection pathway and conduit, reserved electrical service space and panel capacity, and a 5 psf collateral dead load.
Show the zone on the construction documents and post a permanent certificate.
225 CMR 23 C402.3 and Appendix CB.

EV Ready

10 percent of new parking spaces are EV Ready.
Each space has a 40-amp branch circuit wired for 6.6 kW Level II charging, terminating within 6 feet of the space.
225 CMR 23 C405.13.

Compliance Path

COMcheck

Efficiency Credits

17 of 15 required credits. Credits come from C406.2.3 (heat-pump heating at least 10% above the minimum) and C406.2.4 enhanced cooling (10% above minimum).

On-site Renewable

0 of 1,980.

Vestibules

N/A

Paperwork & Modeling

COMcheck

Testing & Verification

Functional test of the automatic lighting controls.
IECC 2021 C408.3.

Climate zone

5A

Indoor air

70 F, 35% RH

Dewpoint of that indoor air

41 F

Outdoor air

1 F

Code

2018 IBC Section 1404.3

1

Drywall

1.13

1.13

67.3 F

41 F

OK

2

Class II vapor retarder

0.00

1.13

67.3 F

41 F

OK

3

R-21 cavity insulation with 2x6 wood studs

21.00

22.13

17.2 F

41 F

First below dewpoint

4

Wood sheathing

0.62

22.75

15.7 F

41 F

Below dewpoint

5

Air barrier

0.00

22.75

15.7 F

41 F

Below dewpoint

6

R-6 continuous insulation

6.00

28.75

1.4 F

41 F

Below dewpoint

7

Siding / cladding

0.17

28.92

1.0 F

41 F

Below dewpoint

1

Concrete slab

0.50

0.50

69.0 F

41 F

OK

2

Vapor retarder

0.00

0.50

69.0 F

41 F

OK

3

R-10 under slab and at the interior edge

10.00

10.50

50.0 F

41 F

OK

4

Gravel / ground

0.00

10.50

50.0 F

41 F

OK

1

Drywall ceiling

1.13

1.13

68.4 F

41 F

OK

2

Air barrier

0.00

1.13

68.4 F

41 F

OK

3

R-49 attic floor insulation

49.00

50.13

1.2 F

41 F

First below dewpoint

4

Vented attic

0.17

50.30

1.0 F

41 F

Below dewpoint

Current

$46.46

$2.27

$44.73

1.01

PHIUS

$52.04

$3.76

$48.94

1.01

Exterior Walls

Current

≥ R-21 cavity insulation (2x6 @ 16" o.c.) with ≥ R-6 continuous exterior insulation.

$7.09

$0.00

$7.09

0.90

PHIUS

≥ R-21 cavity insulation (2x6 @ 16" o.c.) with ≥ R-12.6 continuous exterior insulation.

$7.91

$0.00

$7.91

0.90

Below Grade Walls

Current

N/A

$0.00

$0.00

$0.00

1.00

PHIUS

N/A

$0.00

$0.00

$0.00

1.00

Corridor Walls

Current

N/A

$0.00

$0.00

$0.00

1.00

PHIUS

N/A

$0.00

$0.00

$0.00

1.00

Slab

Current

≥ R-10 perimeter insulation, 2 ft deep, at the interior face of the slab edge, plus ≥ R-10 under-slab insulation, 2 ft wide; provides a full thermal break.

$0.30

$0.00

$0.30

0.90

PHIUS

≥ R-10 insulation under the entire slab; provides a full thermal break.

$0.83

$0.00

$0.83

0.90

Floor Over Unconditioned Space

Current

N/A

$0.00

$0.00

$0.00

1.00

PHIUS

N/A

$0.00

$0.00

$0.00

1.00

Floor Over Garage

Current

N/A

$0.00

$0.00

$0.00

1.00

PHIUS

N/A

$0.00

$0.00

$0.00

1.00

Floor Over Podium

Current

N/A

$0.00

$0.00

$0.00

1.00

PHIUS

N/A

$0.00

$0.00

$0.00

1.00

Rim Joists

Current

≥ R-21 rim/band insulation at floor transitions.

$0.20

$0.00

$0.20

0.95

PHIUS

≥ R-34 rim/band insulation at floor transitions.

$0.27

$0.00

$0.27

0.95

Roof

Current

R-49 cavity insulation.

$0.80

$0.00

$0.80

1.00

PHIUS

Vented attic: ≥ R-60 insulation.

$0.91

$0.00

$0.91

1.00

Windows & Glass Doors

Current

High performance, U ≤ 0.27 / SHGC ≤ 0.30.

$6.21

$0.00

$6.21

1.00

PHIUS

High performance, U ≤ 0.18 / SHGC ≤ 0.18.

$9.36

$0.00

$9.36

1.00

Doors

Current

Opaque door, U ≤ 0.20 (R-5.0).

$0.35

$0.00

$0.35

0.95

PHIUS

Opaque door, U ≤ 0.20 (R-5.0).

$0.35

$0.00

$0.35

0.95

Air Sealing

Current

≤ 0.27 CFM50 per sqft of enclosure (compartmentalization); tested.

$1.29

$0.00

$1.29

0.95

PHIUS

≤ 0.30 CFM50 per sqft of enclosure (compartmentalization); tested.
Whole-building blower door: ≤ 0.06 CFM50 per sqft of enclosure.

$1.20

$0.00

$1.20

0.95

HVAC

Current

Ducted or ductless air-source heat pump, SEER2 17.5 / HSPF2 9.5
1BR: 18 kBtuh
2BR: 24 kBtuh
3BR: 30 kBtuh
Sized to the worst-case design load per bedroom count, see HVAC Design Loads
Ducted and ductless systems both satisfy this spec; if a ducted system is used, every duct must be in conditioned space

$11.24

$0.00

$11.24

1.15

PHIUS

Ducted air-source heat pump (as modeled); SEER2 ≥ 17.5; HSPF2 ≥ 10. See HVAC Design Loads.

$11.52

$0.00

$11.52

1.15

Ductwork

Current

Ducted or ductless. If ducted: all supply and return ducts in conditioned space at every level (including top-floor units), insulated to code minimum. Ducts shall not be located in unconditioned attics or other unconditioned space.

$3.84

$0.00

$3.84

1.00

PHIUS

Supply and return ducts in conditioned space insulated to code minimum.

$3.84

$0.00

$3.84

1.00

Duct Sealing

Current

≤ greater of 80 CFM25 or 8 CFM25 per 100 sqft of conditioned floor area; tested at final.

$0.66

$0.00

$0.66

1.00

PHIUS

≤ greater of 80 CFM25 or 8 CFM25 per 100 sqft of conditioned floor area; tested at final.

$0.66

$0.00

$0.66

1.00

HVAC Grading

Current

N/A

$0.00

$0.00

$0.00

1.00

PHIUS

Fan Flow Test: Grade II
Watt Draw Test: Grade II
Refrigerant Charge: Grade I (weigh-in method)
HVAC installer must provide photo of the digital refrigerant scale showing the amount charged, with the tank on the scale and hoses connected to the outdoor unit, along with a photo of the outdoor unit's data plate.
If the non-invasive procedure in ANSI / RESNET / ACCA 310 is not permitted to be used during the final inspection of a unit (i.e., due to the equipment type or to outdoor air temperatures that do not meet the requirements of the non-invasive method), then the unit is permitted to be certified with a default refrigerant charge designation of Grade III. Note that in these circumstances, the weigh-in method procedure in ANSI / RESNET / ACCA 310 may still be used to pursue a Grade I designation.

$0.00

$0.00

$0.00

1.00

Mechanical Ventilation

Current

In-unit ERV
1-bedroom: 65 CFM, ≥ 87% ASRE
2-bedroom: 65 CFM, ≥ 87% ASRE
3-bedroom: 65 CFM, ≥ 87% ASRE

$1.88

$0.00

$1.88

1.20

PHIUS

In-unit ERV
1-bedroom: 75 CFM, ≥ 85% ASRE
2-bedroom: 100 CFM, ≥ 82% ASRE
3-bedroom: 100 CFM, ≥ 82% ASRE

$2.00

$0.00

$2.00

1.20

Local Mechanical Exhaust

Current

Bathroom(s): at least 50 CFM intermittent and up to 3.0 sones, or at least 20 CFM continuous and up to 2.0 sones.
Kitchen(s): at least 100 CFM intermittent and up to 3.0 sones, or continuous at 5 ACH.
Both: exhaust directly outdoors with ENERGY STAR certified fans. A balanced ERV or HRV serving the space may satisfy this requirement.

$0.93

$0.00

$0.93

1.05

PHIUS

The in-unit ERV is sized to fulfill these exhaust requirements.
Bathroom(s): at least 50 CFM intermittent and up to 3.0 sones, or at least 20 CFM continuous and up to 2.0 sones.
Kitchen(s): at least 100 CFM intermittent and up to 3.0 sones, or continuous at 5 ACH.
Both: exhaust directly outdoors with ENERGY STAR certified fans. A balanced ERV or HRV serving the space may satisfy this requirement.

$0.93

$0.00

$0.93

1.05

Thermostats

Current

Programmable thermostat (as modeled).

$0.11

$0.00

$0.11

1.05

PHIUS

Programmable thermostat (as modeled).

$0.11

$0.00

$0.11

1.05

DHW

Current

Studio / 1-bedroom: In-unit all-in-one heat pump water heater (HPWH); UEF 3.8; 40 gal
2-bedroom: In-unit all-in-one heat pump water heater (HPWH); UEF 3.8; 50 gal
3-bedroom: In-unit all-in-one heat pump water heater (HPWH); UEF 3.8; 65 gal

$1.95

$0.00

$1.95

1.20

PHIUS

1-Bedroom: Heat pump water heater (HPWH) (as modeled); UEF ≥ 3.8; 40 gal
2-Bedroom: Heat pump water heater (HPWH) (as modeled); UEF ≥ 3.8; 50 gal
3-Bedroom: Heat pump water heater (HPWH) (as modeled); UEF ≥ 3.8; 65 gal

$1.95

$0.00

$1.95

1.20

DHW Piping

Current

Supply piping insulated to ≥ R-3.

$0.66

$0.00

$0.66

0.95

PHIUS

Supply piping insulated to ≥ R-3.

$0.66

$0.00

$0.66

0.95

Water Fixtures

Current

WaterSense certified (Lavatory ≤ 1.2 GPM; Shower ≤ 2.0 GPM; Kitchen ≤ 2.2 GPM).

$1.65

$0.00

$1.65

1.00

PHIUS

WaterSense certified (Lavatory ≤ 1.2 GPM; Shower ≤ 2.0 GPM; Kitchen ≤ 2.2 GPM).

$1.65

$0.00

$1.65

1.00

Refrigerator

Current

1-Bedroom: ≤ 500 kWh/yr; electric
2- and 3-bedroom: ≤ 600 kWh/yr; electric

$0.72

$0.00

$0.72

1.10

PHIUS

1-Bedroom: ≤ 500 kWh/yr; electric
2- and 3-bedroom: ≤ 600 kWh/yr; electric

$0.72

$0.00

$0.72

1.10

Dishwasher

Current

≤ 269 kWh/yr; electric.

$0.38

$0.00

$0.38

1.10

PHIUS

≤ 269 kWh/yr; electric.

$0.38

$0.00

$0.38

1.10

Clothes Washer

Current

IMEF ≥ 2.06; IWF ≤ 11.4; ≤ 152 kWh/yr; ENERGY STAR; electric.

$0.44

$0.00

$0.44

1.10

PHIUS

IMEF ≥ 2.06; IWF ≤ 11.4; ≤ 152 kWh/yr; ENERGY STAR; electric.

$0.44

$0.00

$0.44

1.10

Clothes Dryer

Current

ENERGY STAR electric dryer; vented; CEF 3.93.

$0.49

$0.00

$0.49

1.00

PHIUS

Heat pump dryer; ventless; CEF ≥ 6.

$0.90

$0.00

$0.90

1.00

Stove / Oven

Current

Electric range.

$0.53

$0.00

$0.53

1.00

PHIUS

Electric induction cooktop; convection oven.

$0.71

$0.00

$0.71

1.05

Lighting

Current

≥ 100% high-efficacy (LED).

$4.00

$0.00

$4.00

0.85

PHIUS

≥ 100% high-efficacy (LED).

$4.00

$0.00

$4.00

0.85

Solar Ready

Current

Low-rise buildings (225 CMR 22 Appendix RB as amended): unobstructed rooftop solar-ready zone of at least 300 sf and at least 5 ft wide, with a conduit/plumbing pathway to the service panel, reserved dual-pole breaker space, structural loads shown on the construction documents, and a permanent certificate. High-rise buildings and the clubhouse (225 CMR 23 C402.3 → IECC Appendix CB): reserve and keep clear at least 40% of the qualifying roof area, with an interconnection pathway and conduit, reserved electrical service space and panel capacity, 5 psf collateral dead load in the structural design of the zone, construction documents, and a permanent certificate.

$0.30

$0.00

$0.30

1.00

PHIUS

Low-rise buildings (225 CMR 22 Appendix RB as amended): unobstructed rooftop solar-ready zone of at least 300 sf and at least 5 ft wide, with a conduit/plumbing pathway to the service panel, reserved dual-pole breaker space, structural loads shown on the construction documents, and a permanent certificate. High-rise buildings and the clubhouse (225 CMR 23 C402.3 → IECC Appendix CB): reserve and keep clear at least 40% of the qualifying roof area, with an interconnection pathway and conduit, reserved electrical service space and panel capacity, 5 psf collateral dead load in the structural design of the zone, construction documents, and a permanent certificate.

$0.30

$0.00

$0.30

1.00

EV Ready

Current

At least 20% of parking spaces wired EV-ready (40-amp Level II; shared circuits with load management allowed).

$0.34

$0.00

$0.34

1.00

PHIUS

At least 20% of parking spaces wired EV-ready (40-amp Level II; shared circuits with load management allowed).

$0.34

$0.00

$0.34

1.00

HPWH Ready

Current

N/A

$0.00

$0.00

$0.00

1.00

PHIUS

N/A

$0.00

$0.00

$0.00

1.00

Paperwork & Modeling

Current

HERS/ERI model and IECC 2021 checklist for the three-story buildings (ENERGY STAR checklists optional). HERS/ERI model, IECC 2021 checklist, and ENERGY STAR checklists for the four-story buildings. COMcheck for the clubhouse.

$0.03

$2.27

-$2.24

1.00

PHIUS

HERS/ERI model, IECC 2021 checklist, Energy Star checklists, COMcheck.

$0.03

$3.76

-$3.73

1.00

Testing & Verification

Current

ENERGY STAR field verification: pre-drywall and final inspections, unit air-tightness (blower door), duct-leakage, ventilation and exhaust airflow, and HVAC functional testing.

$0.07

$0.00

$0.07

1.00

PHIUS

ENERGY STAR field verification: pre-drywall and final inspections, unit air-tightness (blower door), duct-leakage, ventilation and exhaust airflow, and HVAC functional testing.

$0.07

$0.00

$0.07

1.00