In-field work requirements

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Minimum electricity savings

  • A retrofit job must achieve at least 10% electric (kWh) savings, as calculated on the Savings tab of the Job Reporting Template.

Post-retrofit conditions required for all homes

The following post-retrofit conditions must be met in all homes participating in the program.

  • Air infiltration 130% of the ASHRAE 62.2-2010 mechanical ventilation standard or less
    • Mechanical ventilation is recommended if infiltration is 100% of the ASHRAE standard or less
  • Attic insulation to R-30 or higher (R-38 or higher if attic insulation is upgraded)
    • R-38 level insulation must be used to cover the attic floor, and all vertical attic knee walls must be insulated to no less than R-19
  • Duct leakage to outside to 8% or less (based on measured air flow)
  • At least 2 upgrade measures have been performed

Attic insulation air sealing quidelines

  • View the air sealing and ventilation guidelines
  • Whenever a home performance job is performed, and the attic insulation level is below R-38, an attic upgrade must be part of the work scope.
  • Insulation must not be placed over knob and tube wiring, per code adopted by both Sacramento county and the city of Sacramento.
  • SMUD recommends that air sealing be completed as part of each home performance job, which may require the removal of improperly installed, dirty, wet or contaminated insulation, and the completion of proper air sealing in the attic – especially on the attic floor.
  • SMUD highly recommends that the HPP Participating Contractor not reuse existing insulation as part of a retrofit project, but instead remove existing attic insulation, decontaminate and air seal the attic. New insulation must meet the HPP R-38 requirement and all vertical attic knee walls to no less than R-30.
  • Participating contractors should be aware that a post-retrofit verifier will examine the project’s work and likely will move the attic insulation to determine whether existing insulation was reused and whether the installation meets SMUD HPP insulation requirements.
  • SMUD permits homes that contain insulation that is relatively new (likely within four to five years of insulation), largely effective and uncontaminated, to be reused and combined with new insulation to meet the HPP R-38 target.
  • When insulation is reused, it should be specified in the project’s work scope for post-verification purposes. Please see the table below for more clarification:
  • Use the “Typical Insulation R-values” chart and “Effective R-values for Batt Insulation” chart located in the “BPI Technical Standards for Building Analyst Professional” to determine the R-value(s) of existing attic insulation.
  • If roof has more than one assembly (more than one R-value in the same roof), use average R-value (weighted by the respective areas of each assembly) to determine R-value.

Post-retrofit performance standards for upgraded measures

The following requirements apply only to those upgrades that include the relevant measures in their scopes of work.

  • Any new appliance or measure installed as part of the SMUD Home Performance Program must meet or exceed the requirements of the corresponding SMUD single-measure program, if applicable
  • New or replaced ducts to have insulation value of  R-8 or higher
  • New duct insulation to R-8 or higher
  • New attic ducts should be fully buried (i.e., top of duct at or below insulation level), and preferably deeply buried (top of duct is at least 3.5” below insulation level)
  • New central air conditioners and heat pumps to meet the following standards:
    • 14.5 SEER, 12.0 EER, 8.5 HSPF for split systems
    • 14.0 SEER, 11.0 EER, 8.0 HSPF for package systems
    • 15 SEER, 8.5 HSPF for ductless mini-split systems
  • New whole-house fans to be permanently installed with ≥ 1,000 CFM
  • New domestic water heaters to meet the following standards:
    • Energy Factor (EF) of 0.92 or higher, 30 gallons or greater for electric storage water heaters
    • Energy Factor (EF) of 2.0 or higher, 40 gallons or greater for hybrid electric heat pump water heaters
    • See PG&E for new gas water heater standards
  • New windows to meet the following standards:
    • U-factor 0.30 or less, and
    • SHGC 0.25 or less
  • New pool pumps to meet the following standards:
    • Be variable-speed
    • Controllers (when applicable) must default to low-speed setting
    • Pumps and controllers (when applicable) must be on PG&E’s list of approved pool pumps or approved pool pump controllers
    • All equipment and installation methods must be Title 20 compliant
  • New solar domestic hot water installations to meet the following standards:
    • Solar Fraction greater than or equal to 0.5
    • Solar Rating & Certification Corp. (SRCC) OG-300 certification
  • New lighting qualifying for a rebate must meet Title 24 lighting standards (see JRT for details)
  • Any new equipment or materials installed as part of the upgrade must be used according to the manufacturer’s instructions. Contact Efficiency First-CA or BKi before installing materials if you have any questions about their eligibility in the program.