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Basics & Theory

HPAC: Air-to-Water Heat Pumps in Complementary Hydronic Systems
HPAC magazine says electrically powered heat pumps, in many varieties, are destined to play an increasingly important role in heating and cooling buildings around the world. They convert vast amounts of otherwise unusable low temperature heat into heat at sufficient temperatures to warm buildings or heat domestic water.

NRCan: Air-Source Heat Pumps
Natural Resources Canada describes types, features and benefits of air source heat pumps.
Industry Information

PM Engineer: Cold Climate Air-To-Water Heat Pumps
PM Engineer says electrically powered heat pumps, in many varieties, are destined to play an increasingly important role in heating and cooling buildings around the world.
Issues & Performance

CMHC: Performance Of Cold-Climate Air Source Heat Pump
CMHC research highlight Performance Assessment of a Cold-Climate Air Source Heat Pump looks into its ability to maintain indoor air temperatures, and its energy consumption during cooling and heating season operation. (PDF)

CSA: C273.5-11 Standard For Installation Of Air Source Heat Pumps & Air Conditioners
CSA Standard C273.5-11 - Installation of air source heat pumps and air conditioners supersedes the previous edition published in 1980. It covers installation of unitary, factory-assembled air conditioners and heat pumps (air sink and air source) up to 19 kW (65,000 Btu/h). It should be noted that this edition now includes requirements for air conditioners as well. $120 CDN

CMHC: High Efficiency Air To Air Heat Pumps
CMHC provides features, benefits and considerations for high efficiency air to air heat pumps.

GBA: Heating With A Minisplit Heat Pump
Green Building Advisor describes how to plan to heat your energy efficient house with a single air-source heat pump and a wood stove.

HPAC Magazine: Air-to-Water Heat Pump Systems & Radiant Heating
HPAC Magazine describes a low-ambient air-to-water heat pump combined with a low temperature radiant panel distribution system.

PM Engineer: Applying Cold Climate Air-To-Water Heat Pumps
PM Engineer describes some key technical issues associated with applying air-to-water heat pumps.

US DOE: Hybrid Ductless Heat Pumps For High Performance Electric Homes
US Department of Energy online slide show from their webinar New Construction Hybrid-Ductless Heat Pump Study focuses on the use of ductless heat pumps as a hybrid all-electric heating system in new high-performance homes. In a DHP/hybrid heating system, the DHP fan coil is located in the main living area in combination with electric resistance zone heaters located in the bedroom zones. The DHP carries the bulk of the home’s heating/cooling load while the zone heaters provide supplemental heat as needed. This system provides an ideal alternative to electric resistance zonal heated homes and is capable of displacing a large share of zonal electric heat. (PDF)
Product Supply

ACEE: Selecting Efficient Central Air Conditioning & Air Source Heat Pumps
American Council for an Energy-Efficient Economy provides selection tips, recommended efficiency ratings, and links to more information for central air conditioning and air source heat pumps.

Ecohome: Choosing Between Ground & Air Source Heat Pumps
Ecohome says as a general rule ground source heat pumps may be better for very large homes and those in very cold climates. Air source are definitely more cost effective in small, efficient homes and any moderately sized home in temperate climates.
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