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Saving Energy With Manual J and Manual D

Experts tell builders that HVAC equipment and ducts should be designed according to Manual J and Manual D; the problem is, no one wants to do the calculations

Posted on Aug 13 2010 by Martin Holladay

If you’ve been paying attention to energy-efficiency experts and green-building Web sites, you probably know that it’s important to properly size your HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. equipment. Most sources repeat the same advice: oversized furnaces and air conditioners cost too much, waste energy, and sometimes provide lower levels of comfort.

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Image Credits:

  1. Florida Solar Energy Study

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Now’s a Good Time to Replace Your Heating System

With the 30% tax credit in place for heating system upgrades through the end of 2010, now might be a good time to consider an upgrade.

Posted on Apr 27 2010 by Alex Wilson

If your heating system is old and inefficient, now is a great time to replace it with a new, high-efficiency model. There are eight months remaining to take advantage of the 30% federal tax credit that’s available for installing energy-efficient gas- or oil-fired furnaces and boilers, as well as air-source heat pumps.

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Image Credits:

  1. York/Johnson Controls

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Ground-Source Heat Pumps Don’t Save Energy

Ground-source heat pumps are sometimes seen as a magic technology that can provide an endless supply of environmentally friendly energy. There’s only one problem: ground-source heat pumps aren’t necessarily more energy efficient than traditional home heating systems.

Posted on Apr 6 2009 by Henry Gifford

To understand how a heat pumpHeating and cooling system in which specialized refrigerant fluid in a sealed system is alternately evaporated and condensed, changing its state from liquid to vapor by altering its pressure; this phase change allows heat to be transferred into or out of the house. See air-source heat pump and ground-source heat pump. works, imagine using your refrigerator to keep your kitchen warm all winter. Let’s say you haul a bucket of 55° water from a backyard well and put it in your refrigerator to cool it down to 50°. Because the heat removed from the water escapes from the coils at the back of the refrigerator, you have just delivered heat to your kitchen. If you get tired of replacing the bucket of 50° water with new 55° water, you could just install a pump to circulate water to and from the pond.

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The Highest Efficiency Rating Is Found in Condensing Furnaces

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Image Credits:

  1. John Hartman / Fine Homebuilding
  2. Andy Engel/Fine Homebuilding
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