Part 1: Evaluation of Mini-Split Heat Pumps as Supplemental and Full System Retrofits in a Hot-Humid Climate

More stringent energy efficiency standards and the demand for higher efficiency are increasing the popularity of technologies such as mini-split heat pumps (MSHPs). The market for ductless heat pumps is growing 10–30% annually. The U....

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Building a Boiler Side-Arm

Author: Michael Lamb

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November 01, 1999

A boiler is generally more fuel efficient than a standard gas water heater, especially when the boiler is fully loaded. [continue reading]

Fuel Use in Multifamily Buildings

Author: F.L. Andrew Padian

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November 01, 1999

Multifamily buildings with more than five units make up about 17% of all U.S. housing, yet scant information exists on the fuel use of these building in specific locations (see "Multifamily Statistics"). [continue reading]

Ground Source Heat Pumps Dig In

Author: Sandy Cataldo

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September 01, 1999

Ground source heat pumps (sometimes called geothermal heat pumps, Geo-Exchange Systems, or GHPs) most often exchange heat with the ground by means of a ground heat exchanger. [continue reading]

Dangerous Heater Parts Recalled

Author: Colleen Turrell

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July 01, 1999

In 1997, Cadet Manufacturing in Vancouver, Washington, issued a recall notice on some of its electric in-wall heaters. The heaters contain limit switches that have been identified as a fire hazard by the U.S. Consumer Product Safety Commission (CPSC). [continue reading]

Dangerous Heater Parts Recalled

Author: Colleen Turrell

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July 01, 1999

A Bright Future for Advanced Fireplaces

Author: Skip Hayden

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January 01, 1999

The severe ice storm of January 1998 in eastern Canada and the northeastern United States showed the benefits of efficient gas and wood fireplaces that can operate independently of electricity, and increased interest in high-performing fireplaces that supply comfortable heat during an extended power outage. [continue reading]

Regulating Ventless Heaters

Author: Steven Bodzin

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January 01, 1998

Ventless gas heaters have seen sales take off over the past few years, buoyed by their low cost, attractive design, and high efficiency. [continue reading]

Thermostats That Feel the Heat

Author: Tom Wilson

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November 01, 1997

Most American thermostats measure only air temperature. But there are numerous other elements that affect thermal comfort, and some of these can be used to turn HVAC equipment on and off. [continue reading]