what is the maximum amount of credit from residential energy credit
For purchases made in 2011 - 2014: Aggregate amount of credit is limited to $500. Taxpayer is ineligible for this tax credit if this credit has already been claimed by the taxpayer in an amount of $500 in any previous year.For purchases made in 2009 or 2010: Aggregate amount of credit for all technologies placed in service in 2009 and 2010 combined is limited to $1,500.wners of existing homes may receive a tax credit worth 10% of the cost of upgrading the efficiency of the building's envelope. Installation (labor) costs are not included and the credit is capped at $500 for all improvements.