Library

Informational guide describing the design, installation, and maintenance best practices and technical considerations for integrated Heat Pump Water Heaters in single-family and multifamily new construction.

Report describing the advantages and best practices for installing heat pump water heaters (HPWH), highlighting their improved energy efficiency, reliability, and critical considerations such as condensate management, proper sizing, and optimal installation location to enhance performance and...

Report describing the significant potential for energy use reductions through heat pump water heaters, which have been a crucial part of Northwest power plans for decades and have recently achieved substantial savings with new integrated models and climate specifications.

Report describing the features, benefits, and best practices for the design and installation of heat pump water heaters in new low-rise multifamily buildings, highlighting their efficiency, reliability, and contribution to decarbonization goals.

Report describing a laboratory assessment that provides insights into space requirements and venting strategies for heat pump water heaters (HPWH) to enhance retrofit installations and provide actionable guidance for manufacturers, designers, engineers, installers, and owners.

Guide providing detailed selection and installation instructions for heat pump water heaters.

Presentation about heat pump water heater modeling using EnergyPlus.

Article discussing the advantages of using heat pumps and/or hydronic forced air heat instead of furnaces in high-performance homes.

Webpage providing basic information on various types of heat pumps and their applications in Massachusetts.

Blog post about heat pump clothes dryers.

Report providing information for HVAC designers, installers, and consumers about air source heat pumps.

Report discussing the potential energy savings of new high-efficiency downlights, and the results of product testing to date.

Guide describing how to choose energy-efficient water heaters, including heat pump models, with tips on installation, rebates, and incentives for maximizing energy savings.

Report sumarizing results of an ICF investigation of side-by-side houses in Knoxville, Tennessee.

ENERGY STAR webpage describing how a heat pump water heater works.

Factsheet describing how to partially install a heat pump in a manufactured home in the manufactured home factory.

Website blog with guidance about calculating heat-loss.

Report describing the identification of barriers and proposed practical solutions for the design, installation, and market adoption of heat pump water heaters in new low-rise multifamily housing, focusing on studio and one-bedroom units.

Factsheet outlining the advantages of using heat pumps, which are an efficient way to heat and cool a home.

Webpage providing curriculum with links to presentations and problem sets for teaching an understanding of sizing cold climate heat pumps.

Correcting pressure imbalances in your HVAC system can result in a healthier, more efficient home.

Journal article detailing laboratory and simulation studies quantifying the impact that heat pump and air conditioner installation faults have on system capacity and efficiency.

Report presenting improved air conditioner (AC) and heat pump (HP) modeling methods in the context of whole-building simulation tools.

Presentation on Improving Air-Conditioner and Heat Pump Modeling.

Report describing the performance, economics, space heating impacts, and user satisfaction of heat pump water heaters (HPWHs) in the upper Midwest, based on a field study and survey of participants in the MECA HPWH incentive program.

Factsheet describing techniques for installing ductless heat pumps in cold climate locations.

Report describing the objective evaluation of space conditioning interactions between heat pump water heaters and home heating systems during winter 2016-2017, revealing a smaller than anticipated impact on space conditioning loads.

Report describing the results of a 21-home field study investigating the effectiveness and failure rates of whole-house mechanical ventilation systems installed in Florida homes over the last 15 years.

Report on performance of current diagnostics as well as a draft test method for use in future air flow evaluations.

Guidance on performance of current diagnostics as well as a draft test method for use in future air flow evaluations.

Report presenting lab evaluation of five heat pump water heaters available in the US market today.

Report proposing mini-split heat pumps as a new retrofit option to replace resistance heating in the Pacific Northwest.

Report describing research conducted to support California’s Title 24, Part 6 Building Energy Efficiency Standards by analyzing the impact of installation location and ventilation on heat pump water heater (HPWH) performance, emphasizing the need for proper installation to maximize efficiency...

Web article describing two options for sizing ductless minisplit heat pumps, including a free HVAC sizing tool.

Report on the long-term performance of mini-split heat pumps.

Report using a field test plan to evaluate the success of implementing energy efficiency upgrades at the community scale incorporating whole-house systems integrated measures package (SIMP).

Report identifying the target market for solar water heaters and potential pathways and cost/performance targets that must be met for these systems to realize large energy savings.

Factsheet describing how to test the duct leakage of a manufactured home in the manufactured home factory.

Measure Guideline describing how to assess and carry out the isolation of natural draft combustion appliances from the conditioned spaces of low-rise residential buildings.

This measure guideline provides guidance on combustion safety inspection procedures for appliances and heating equipment that use indoor air for combustion and dilution of flue gases in low-rise residential buildings.

Document with evaluation of 14 heat pump water heaters (including three recently released HPWH products) installed in existing homes in the northeast region of the United States.

Research study outlining results of monitoring a low temperature heat pump.

Repor ourlining testing results from a 53 home monitored sample, long-term energy use of electric resistance clothes dryers.

Report describing a lighting and smart power strip retrofit evaluation that was conducted on 56 all-electric, existing Florida homes to see how lighting and miscellaneous electric loads might be reduced.

Report describing an analysis method for determining optimal residential energy efficiency retrofit packages and applies the analysis method to a 1960s-era home in eight U.S. cities.

Standard that prescribes a testing method to determine the efficiency of space heating and/or cooling thermal distribution systems under seasonal and design conditions. This version of the standard was published in the year 2014, and is available for preview and purchase at the reference link. The...

This report investigates whether mini-split heat pumps can live up to their potential for one market segment: multifamily retrofits.

Study in which a central heat pump water heater system was monitored in detail and used to create a model for assessing similar systems in various climates.

Database compiling extended capacity data for numerous cold climate heat pump manufacturers and models.

Document on the development of two simple in-home efficiency test methods that can be used by technicians, researchers, or interested homeowners to verify the correct operation and energy efficiency of a homes air conditioning and heating equipment.