9 of 10
BACKNEXT
First, get an energy audit
Before getting your head in the clouds and contemplating the virtues of a wind turbine, however, experts caution homeowners to consider an expense the tax credit will not cover: an energy audit.

These audits, which are sometimes offered free by a local utility, provide a detailed report of the energy efficiency of a house. The auditor locates leaks, checks ductwork and insulation, measures emissions such as carbon monoxide, and checks the efficiency of the lighting system. Some states credential contractors to provide audits, which can cost between $200 and $500. That fee is sometimes reduced if the contractor is employed to implement the upgrades.

It's money well spent, says Jason Hartke of the Green Building Council. Hartke says it's vital to discover leaks and seal them before moving on to other energy-saving investments. "There's a critical path to follow. Otherwise, you could try to do something sophisticated that won't get you the savings you want."

NEXT: If you're thinking of buying a house

Last updated May 07 2009: 12:57 PM ET
More Galleries
6 great Memorial Day car deals Here are some hot tips if you're going out car-shopping this weekend. More
10 multi-million-dollar mega-yachts These folks definitely do not need a bigger boat. Peek inside some of the swankiest vessels on the high seas. More
Build your own eco-friendly house Home is wherever you want it to be. This 150-square-foot home can be shipped almost anywhere and then assembled like Ikea furniture in about four days. More

Special Offer
Market indexes are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer LIBOR Warning: Neither BBA Enterprises Limited, nor the BBA LIBOR Contributor Banks, nor Reuters, can be held liable for any irregularity or inaccuracy of BBA LIBOR. Disclaimer. Morningstar: © 2012 Morningstar, Inc. All Rights Reserved. Disclaimer The Dow Jones IndexesSM are proprietary to and distributed by Dow Jones & Company, Inc. and have been licensed for use. All content of the Dow Jones IndexesSM © 2012 is proprietary to Dow Jones & Company, Inc. Chicago Mercantile Association. The market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. FactSet Research Systems Inc. 2012. All rights reserved. Most stock quote data provided by BATS.