Skip to content

Resource Library

Efficiency First CA: Calculators

Website

Overview

EFCA has new calculators! The Air Leakage Calculator, Duct Leakage Calculator, and SLA Calculator will support your efforts to achieve superior energy efficiency.

Love testing houses but hate doing math? EFCA has new calculators!

The new Air Leakage Calculator includes advanced metrics like ACH50 (Air Changes per Hour at 50 Pascals) and EqLA (Equivalent Leakage Area).

These features provide more detailed and actionable insights, helping you better understand and manage air leakage.

They’ve also introduced the Duct Leakage Calculator, a powerful tool that measures air leakage in your duct system relative to airflow. This calculator will assist you in optimizing HVAC performance and ensuring peak efficiency.

While the SLA Calculator has always been a favorite benefit on the EFCA website, these new tools will further support your efforts in achieving superior energy efficiency.

Explore all three calculators on the Efficiency First CA website!

Related Resources

Hyperlink icon to reveal a BPA Resource

IREC: Registered Apprenticeships Toolkit for Clean Energy Employers

This toolkit is intended to provide employers and other stakeholders with the background information and supplemental resources needed to implement Registered Apprenticeship Programs (RAPs) to develop a clean energy workforce.

Download this BPA resource

Insulation Institute: Getting Your Home Heat Pump Ready

This guide details the key actions homeowners should take prior to upgrading their homes with a high-efficiency heat pump.

Download this BPA resource

Non-Energy Impacts of Weatherization 

Download to read the study which discusses various issues related to incorporating non-energy impacts (NEIs) into costeffectiveness screening and measure selection in the Weatherization Assistance Program (WAP).