BASC Search

This plot shows a heat pump’s minimum and maximum cooling capacities overlaid with a home’s cooling load line, allowing a designer to assess how well-suited the equipment is for the specific home.

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Wrong: This heat pump is oversized even for Approach 4, and its modulating zone has a small overlap with the home’s heating load line, resulting in a large amount of short-cycling.

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Measure Guideline: Ventilation Guidance for Residential High-Performance New Construction - Multifamily

Reference

Report describing the most cost-effective ventilation and indoor air quality solutions for multifamily homes that meet ASHRAE 62.2-2016.

Heat Pump Retrofit Strategies for Multifamily Buildings

Reference

Report describing the various heat pump retrofit options for multifamily buildings in the U.S., segmented by building typology and heating system, to support better environmental, economic, and health outcomes.

An independent ducted dehumidifier draws air from and supplies air to the living space using its own ducts, not ducts that are connected to the HVAC system

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The dehumidifier draws air from a common area in the house, dehumidifies it, and adds it to the supply side of the central air handler for mixing and distribution

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The dehumidifier draws air from a common area in the house, dehumidifies it, and adds it to the return side of the air handler for conditioning, mixing, and distribution

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Long-Term Monitoring of Mini-Split Ductless Heat Pumps in the Northeast

Reference

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

Residential Mechanical Precooling

Reference

Report evaluating mechanical AC precooling strategies in homes as a method for improving the load factor by shifting cooling operation from on-peak to off-peak hours.

Comparing Motor Technologies

Reference

Article in the Air Conditioning, Heating and Refrigeration NEWS newsletter describing PSC, ECM, and ECM replacement motors for HVAC equipment.

Air Source Heat Pumps Tax Credit

Reference

This is a federal tax credit for complying air source heat pumpe. Units located in the "North" must meet ENERGY STAR's cold climate heat pump criteria.

Wrong: Sized per Approach 3, there is small overlap between this heat pump’s modulating zone and the home’s heating load line, resulting in excessive short-cycling; it will require backup heat when the temperature is below 5°F

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Technology Solutions Case Study: Improving the Field Performance of Natural Gas Furnaces

Case Study

Case study describing field study of gas furnaces, and recommendations for installation.

Technology Solutions Case Study: Selecting Ventilation Systems for Existing Homes

Case Study

Case study describing ventilation selection for existing homes.

Energy Savings and Breakeven Costs for Residential Heat Pump Water Heaters in the United States

Reference

Report investigating performance and energy savings potential of heat pump water heaters.

Building America Top Innovations 2014 Profile - California Energy Standards Recognize the Importance of Filter Selection

Reference

Web report explaining how correct filter sizing is an issue that applies to all new and existing homes that use ducted HVAC systems.

Retrofitting Las Vegas: Implementing Energy Efficiency in Two Las Vegas Test Homes

Reference

Report about cost effective energy-efficient upgrades that can be implemented in the hot, dry Southwest climate.

Distribution and Room Air Mixing Risks to Retrofitted Homes

Reference

Report outlining the issues with using existing ducts with a new low-load HVAC system, which reduces throw at supply registers causing decreased mixing of supply and room air, leading to potential thermal comfort complaints.

Tips to Eliminate Energy Waste

Reference

Webpage describing methods to save energy at home, including turning down your water heater set point, scheduling your HVAC system, adding or fixing weatherstripping, and changing HVAC system filters, among other tips.

Impact of Residential Mechanical Ventilation on Energy Cost and Humidity Control

Reference

The study described in this white paper is based on building energy modeling with an important focus on the indoor humidity impacts of ventilation.

This plot shows a heat pump’s minimum and maximum heating capacities overlaid with a home’s heating load line as well as the annual heating load hours for the home, allowing a designer to assess how well-suited the equipment is for the specific home.

Image

Right: Sized per Approach 3, this heat pump’s modulating zone has a large overlap with the home’s heating load line; it will require backup heating but could still contribute significant heating for all hours of the heating season

Image

Wrong: Sized per Approach 1 or 2, this heat pump’s modulating zone has a small overlap with the home’s heating load line, resulting in a large amount of short-cycling; the unit will require backup heat when the temperature is below 25°F

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Right (decent): For a relatively high-capacity ccASHP sized per Approach 3 or 4 to meet nearly 100% of the heating load, this heat pump’s modulating zone has a decent overlap with the home’s heating load line, reducing short-cycling.

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Wrong: Sized per Approach 3, there is minimal overlap between this heat pump’s modulating zone and the home’s heating load line, causing excessive short-cycling; it will require backup heat and may not contribute significantly at temperatures below 5°F

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2023 ASHRAE Handbook - HVAC Applications

Reference

Guidebook covering basic principles and data used in the HVAC&R industry. This is the 2023 edition of the handbook, which can be purchased physically or digitally at the reference link in versions using either I-P units of measurement or SI units of measurement.

This plot shows a heat pump’s minimum and maximum cooling capacities overlaid with a home’s cooling load line, allowing a designer to assess how well-suited the equipment is for the specific home.

Wrong: This heat pump is oversized even for Approach 4, and its modulating zone has a small overlap with the home’s heating load line, resulting in a large amount of short-cycling.

Measure Guideline: Ventilation Guidance for Residential High-Performance New Construction - Multifamily

Heat Pump Retrofit Strategies for Multifamily Buildings

An independent ducted dehumidifier draws air from and supplies air to the living space using its own ducts, not ducts that are connected to the HVAC system

The dehumidifier draws air from a common area in the house, dehumidifies it, and adds it to the supply side of the central air handler for mixing and distribution

The dehumidifier draws air from a common area in the house, dehumidifies it, and adds it to the return side of the air handler for conditioning, mixing, and distribution

Long-Term Monitoring of Mini-Split Ductless Heat Pumps in the Northeast

Residential Mechanical Precooling

Comparing Motor Technologies

Air Source Heat Pumps Tax Credit

Wrong: Sized per Approach 3, there is small overlap between this heat pump’s modulating zone and the home’s heating load line, resulting in excessive short-cycling; it will require backup heat when the temperature is below 5°F

Technology Solutions Case Study: Improving the Field Performance of Natural Gas Furnaces

Technology Solutions Case Study: Selecting Ventilation Systems for Existing Homes

Energy Savings and Breakeven Costs for Residential Heat Pump Water Heaters in the United States

Building America Top Innovations 2014 Profile - California Energy Standards Recognize the Importance of Filter Selection

Retrofitting Las Vegas: Implementing Energy Efficiency in Two Las Vegas Test Homes

Distribution and Room Air Mixing Risks to Retrofitted Homes

Tips to Eliminate Energy Waste

Impact of Residential Mechanical Ventilation on Energy Cost and Humidity Control

This plot shows a heat pump’s minimum and maximum heating capacities overlaid with a home’s heating load line as well as the annual heating load hours for the home, allowing a designer to assess how well-suited the equipment is for the specific home.

Right: Sized per Approach 3, this heat pump’s modulating zone has a large overlap with the home’s heating load line; it will require backup heating but could still contribute significant heating for all hours of the heating season

Wrong: Sized per Approach 1 or 2, this heat pump’s modulating zone has a small overlap with the home’s heating load line, resulting in a large amount of short-cycling; the unit will require backup heat when the temperature is below 25°F

Right (decent): For a relatively high-capacity ccASHP sized per Approach 3 or 4 to meet nearly 100% of the heating load, this heat pump’s modulating zone has a decent overlap with the home’s heating load line, reducing short-cycling.

Wrong: Sized per Approach 3, there is minimal overlap between this heat pump’s modulating zone and the home’s heating load line, causing excessive short-cycling; it will require backup heat and may not contribute significantly at temperatures below 5°F

2023 ASHRAE Handbook - HVAC Applications

Measure Guideline: Combined Space and Water Heating Installation and Optimization

Field Monitoring Protocol: Mini-Split Heat Pumps

Energy Impacts of Nonlinear Behavior of PCM When Applied into Building Envelope

Residential Feedback Devices and Programs: Opportunities for Natural Gas