The residential buildings stock is diverse and generally requires the most individual attention by energy auditors and contractors per unit of energy saved. Existing residential buildings need a pathway towards a more streamlined approach for energy savings retrofits. To this effect, Pacific Northwest National Laboratory (PNNL) with funding from the Department of Energy's Building Technologies Office (BTO) and Weatherization Assistance Program (WAP) developed the following tools to help contractors execute energy efficiency retrofits in a more streamlined way than ever before.
 | The Retrofit Decision Tool is a place for homeowners, multifamily building owners and contractors to start the conversation about which retrofits make the most sense for their home or multifamily building. |
 | While there are many high-performance water heating options, the Heat Pump Water Heater Installation tool helps contractors, installers, and homeowners through the decision-making process for heat pump water heater (HPWH) product selection and installation, with a focus on overcoming installation barriers. |
 | While there are many high-performance HVAC options, the Cold Climate Heat Pump Decision Tool guides contractors and installers through the decision-making process for heat pump (HP) sizing, identifying personalized recommendations, and applicable tax credits, with a focus on retrofits in cold climates. |
 | The Weatherization Assistance Program (WAP) and the Building Technologies Office (BTO) of the Department of Energy (DOE) have collaborated to purchase the RED Calc web app software, providing free building science calculation tools used by building professionals around the world. |
 | The Quality Install Tool is an open-source web app designed to simplify and expedite the creation of high-quality installation documentation for many types of efficiency upgrades. |