| Heat Pump | The term heat pump is used in this report to refer to a heat pump for either space or water heating in residential applications. Some best practices are only applicable to space or water heating, and are called out as such. |
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| Program Administrator | An energy efficiency incentive program administrator is a utility, state energy office, third party, or another entity that operates a formal energy efficiency program. Some details in this report are specific to a certain type of administrator, such as a state energy office, and are called out as such. |
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| Incentives | When used in this report, incentives are an umbrella term referring to programmatic offerings such as rebates, discounts, tax credits, and more. |
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| Midstream Programs | Midstream programs are those that target distributors and contractors, typically through a cooperative agreement to provide discounts on eligible equipment. |
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| Downstream Programs | Downstream programs are those that target product end-users, in this case residential customers. This most often refers to rebate programs, and “rebate” is used interchangeably with downstream programs throughout. |
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