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Basics & Theory

Healthy Heating: History Of HRVs & ERVs
Healthy Heating provides a history of heat recovery ventilators and energy recovery ventilators. Some of the earliest models to be marketed in North America dating back to the late 1970's.

NRCan: Overview On How An HRV Works
Natural Resources Canada describes components of a heat recovery ventilator (HRV), and how they work. (PDF)
Issues & Performance

CCHC: Three-Stage HRV Defrost Evaluation In Alaska
Alaska Cold Climate Housing Research Center paper discusses the effectiveness of various HRV frost protection strategies, the energy use of the system, and the effect of continuous ventilation on indoor air quality in a cold climate home.

CCHRC: ERV Effectiveness In Cold Climates
Alaska Cold Climate Housing Research Center study was designed to determine if ERVs improve indoor relative humidity over HRVs and to compare the energy recovery effectiveness of an ERV to that of an HRV. The study found that at indoor relative humidity levels above 25% the ERV can significantly improve the relative humidity over an HRV, but at lower RH there is less improvement in indoor humidity. The energy effectiveness data is inconclusive with the ERV and HRV core showing similar sensible effectiveness. (PDF)

Energy Star: 2009 Specification For HRV & ERV Efficiency
Energy Star specification for HRV & ERV in Canada includes minimum sensible heat recovery efficiency and a minimum fan efficacy requirement. NRCan will release the final specification in the near future. Version 1.0 will be in effect July 1, 2009, with a revision of the specification to follow in July 2012. (PDF)

Home Energy: ERV Problems With Formaldehyde
Home Energy Magazine says some energy recovery ventilators ERVs can recover formaldehyde in the same way that they recover water.

NRC: Test Method For IAQ Impact Of HRV & ERV
National Research Council of Canada describes a test method for evaluation of IAQ impact of balanced residential ventilation devices that Incorporate heat recovery ventilation and/or enthalpy recovery ventilation. (PDF)

NRCan: Energy Star Canada Qualifying Criteria For HRVs & ERVs
Natural Resources Canada lists their Energy Star qualifying criteria for residential heat recovery ventilators and energy recovery ventilators.
Procedures

BC Housing: Heat Recovery Ventilation Considerations For Builders
BC Housing online bulletin describes heat recovery ventilation considerations for builders and designers. (PDF)

BC Housing: Heat Recovery Ventilation Guide For Houses
BC Housing online Heat Recovery Ventilation Guide For Houses consolidates best practices for the design, installation and maintenance of heat recovery ventilation systems in single family, semi-detached and row housing. It is intended to assist builders, renovators and owners gain a better understanding of heat recovery ventilators (HRV) and energy recovery ventilators (ERV) and how they can support a healthy indoor living environment. (PDF)

BC Housing: Maintaining Your Heat Recovery Ventilator
BC Housing describes issues and considerations for operation and maintenance of a heat recovery ventilator. (PDF)

Building Science: Balanced Ventilation Systems (HRVs & ERVs)
Building Science describes features. Benefits, and considerations for balanced ventilation systems (HRVs and ERVs).

CCHRC: Carpenter Guide to HRVs In Alaska
Cold Climate Housing Research Center online Heat Recovery Ventilator Guide for Carpenters describes design and installation considerations for HRVs in Alaska. (PDF)

CMHC: Heat Recovery & Energy Recovery Ventilators Guide For Property Managers
CMHC online guide Heat Recovery & Energy Recovery Ventilators Guide For Property Managers covers basic understanding of HRV and ERV, how to make it run efficiently, and how to keep it in good condition. (PDF)

CMHC: Heat Recovery Ventilators
CMHC describes features, benefits, and considerations for heat recovery ventilators.

CMHC: HRV & ERV Guide for High Rise Multi-Unit Residential Buildings
CMHC online guide HRV & ERV Guide for Multi-Unit Residential Buildings describes how to design, install and operate heat recovery and energy recovery ventilation systems in high rises. (PDF)

CMHC: Increasing Northern Housing Ventilation Rates With HRVs
CMHC research showed the increase in ventilation associated with the use of properly installed and operated HRVs in northern housing can reduce indoor air contaminants. (PDF)

CMHC: Maintaining An HRV
CMHC checklist reviews steps to maintain an HRV including cleaning & replacing of filters, servicing of fans, a simple test to determine if HRV is balancing fresh air flow with exhaust flow, when to call a service technician, and an easy-to-follow maintenance calendar. (PDF)

CMHC: Northern Mechanical Ventilation Equipment Design & Testing
CMHC research highlight Northern Mechanical Ventilation Equipment Design and Testing summarizes the analysis of existing codes or standards and/or currently available or emerging ventilation technologies to see if they are capable of addressing identified concerns. It also discusses the need for a Northern HRV performance specification and includes a draft of a Northern HRV technical specification. (PDF)

Construction Instruction: HRV System Best Practices
Construction Instruction provides tips and recommendations to make the most of your HRV installation.

GBA: Choosing Between HRV & ERV
Green Building Advisor discusses whether a heat-recovery ventilator or an energy-recovery ventilator is right for a cold climate, when choosing equipment for a whole-house ventilation system.

GBA: Does Home With HRV Also Need Bath Fans?
Green Building Advisor says most homeowners find that an HRV with dedicated ductwork moves enough air to clear condensation from bathroom mirrors.

GBA: How To Balance An HRV
Green Building Advisor Q & A offers suggestions on how to balance the intake and exhaust of an HRV.

GBA: New Way To Duct HRVs
Green Building Advisor says in some types of new homes you may want to consider exhausting stale air from bedrooms instead of pulling exhaust air from bathrooms and the laundry room.

GBA: Ventilation Omission That Can Make You Sweat
Green Building Advisor says if you connect an ERV or HRV to your heating and cooling ducts, you’ll need a way to stop the undesired inward flow of outdoor air.

JLC: Installing A Heat Recovery Ventilator
Journal of Light Construction article gives a good overview (with pictures) of how HRVs work, and an example of how they are installed. (PDF) Free Registration Required
Product Supply

GBA: Are HRVs Cost-Effective?
Green Building Advisor says compared to a simple exhaust fan, a heat-recovery ventilator saves energy but it probably won't save enough to justify the high cost of the equipment.
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