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7 Steps to an Energy-Efficient House: 5. Mechanicals

Replace your furnace or boiler with a new energy-efficient model

Is it time for a new furnace? While many older gas furnaces have efficiencies of 78% or less, a new condensing furnace should have an efficiency of 90% or more.
Image Credit: Bryant Heating and Cooling


Editor’s introduction: With energy prices rising again, many homeowners are planning energy-efficiency improvements to their homes. But most people are unsure of where to begin, and even seasoned builders don’t always know which priorities should rise to the top of the list. Betsy Pettit, an architect at Building Science Corporation
, recommends starting where you can get the most bang for the buck.

Step 5: Replace your furnace, boiler, or water heater

An old furnace or boiler is often the worst energy user in an old house. Many houses built prior to 1920 still have old coal-fired boilers that were converted to gas or oil. These units are workhorses, but use a lot of energy. A new furnace or boiler can save energy dollars right away.

Replacing window air conditioners with a central system also can save energy right away, as long as the ductwork is located in the conditioned space. Solar water heating is a good option to add here if you can afford it, but at the very least, upgrade the efficiency of hot-water production by coupling the tank to the boiler.

This article is adapted from Betsy Pettit’s Remodeling for Energy Efficiency
in Fine Homebuilding


In Green Basics:

Heating Options

Water Heating

Heat Distribution

Cooling Options

In Product Guide:

Mechanical Systems / HVAC

In Blogs:

Heating a Tight, Well Insulated House

Air-Source Heat Pumps

Storage vs. Tankless Water Heaters

Solar Hot Water

Heat-Pump Water Heaters

Using Your Heating System to Heat Water

Improving Water Heater Efficiency

Air Conditioner Basics

Deciphering the Tax Credits


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