Proposed Class 30 Window Minimum Efficiency Standard

1
Proposed Class 30 Window Minimum Efficiency
Standard
September 20, 2005
2
Background Why Change

• Original (1983) Council MCS called for adoption
  of Class 30 windows in PNW Energy Codes
• Current minimum efficiency standard for
  Residential Retrofit and New Construction
  programs is Energy Star (Class 35)
• Alliance program evaluation revealed that 80
  of windows sold in PNW are meet Energy Star
  (Class35)
• Energy Codes in Zone 2 (E. WA), Idaho and Montana
  require class 35 windows

3
Availability of Class 30 Windows
Frame/Sash Type Air Argon Argon/ Krypton/ Air Mixture Krypton Krypton / Argon Krypton / Krypton Total
Other / Vinyl 0 36 0 0 0 0 36
Plastic / Plastic 0 4 0 0 0 0 4
Vinyl / Other 0 21 0 0 0 0 21
Vinyl / Vinyl 47 2129 39 1066 4 1 3286
Wood / 0 3 0 0 0 0 3
Wood / Vinyl 0 6 0 0 0 0 6
Wood / Wood 0 19 0 0 0 0 19
Total 47 2218 39 1066 4 1 3375
Source NFRC Data Base Extract by Craig Conner,
June 2005
4
Characteristics of Class 30 Windows
Frame/Sash Type Air Argon Argon/ Krypton/ Air Mixture Krypton Krypton / Argon Krypton / Krypton Total
Other / Vinyl 0 1 0 0 0 0 1
Plastic / Plastic 0 0 0 0 0 0 0
Vinyl / Other 0 1 0 0 0 0 1
Vinyl / Vinyl 1 63 1 32 0 0 97
Wood / 0 0 0 0 0 0 0
Wood / Vinyl 0 0 0 0 0 0 0
Wood / Wood 0 1 0 0 0 0 1
Total 1 66 1 32 0 0 100
5
Estimated Savings over Energy Star (Class 35)
Windows (kWh/sqft-glass/yr)
Home Type Heating Zone 1 Heating Zone 2 Heating Zone 3 PNW Region
Ex SF 1.5 1.9 2.3 1.6
Ex MF 0.8 1.4 1.6 1.0
Ex MH 2.1 2.8 3.4 2.3
New SF 1.5 2.0 2.4 1.7
New MF 1.4 1.9 2.3 1.5
New MH 1.4 1.8 2.2 1.5
6
Regional Benefit/Cost Ratio for Class 30 Windows
_at_ Average Cost 1.36 sq.ft)
Home Type Heating Zone 1 Heating Zone 2 Heating Zone 3 PNW Region
Ex SF 1.2 1.6 1.8 1.5
Ex MF 0.7 1.1 1.3 0.8
Ex MH 1.3 1.7 2.0 1.4
New SF 1.4 1.8 2.1 1.5
New MF 1.3 1.7 2.1 1.3
New MH 1.4 1.9 2.3 1.5
7
Potential BPA PostFY06 Credit/Reimbursement Level
_at_ 0.30 kWh/yr (/sqft-glass)
Home Type Heating Zone 1 Heating Zone 2 Heating Zone 3 PNW Region
Ex SF 0.44 0.58 0.69 0.48
Ex MF 0.25 0.41 0.49 0.29
Ex MH 0.63 0.85 1.01 0.68
New SF 0.46 0.61 0.73 0.50
New MF 0.41 0.57 0.68 0.45
New MH 0.41 0.55 0.66 0.45
8
Proposed Recommendation

• RTF Recommends that commencing January 2006 or as
  soon as practicable thereafter, PNW residential
  weatherization and new construction programs
  adopt minimum efficiency standards for windows of
  class 30 (U-factor 30)
• May be satisfied by achieving a area weighted
  average of class 30 (U-factor 30) or better