In 2005, Congress enacted two tax credits to spur residential energy. The 25C credit is for renovating existing homes, and the 25D credit is for installing power production in new and existing homes.
Through data from the IRS, NAHB Eye on Housing revealed how taxpayers have been using the credits since 2012.
In 2014, 705,000 taxpayers claimed a 25C credit via window upgrades connected to a total dollar value of $1.1 billion of improvements. … Including 154,000 returns using carryforwards of unclaimed credits, more than 400,000 taxpayers claimed a 25D credit in 2014. In total, $3.6 billion in 25D-qualifying installations were made in 2014, yielding credits totaling $1.1 billion.