Renewable Energy Tax Parity Act of 2007 - Amends the Internal Revenue Code to include a 30% credit for qualified biomass fuel property expenditures as part of the tax credit for residential energy efficient property. Defines "qualified biomass fuel property expenditure" as an expenditure for property which uses the burning of biomass fuel (i.e., any renewable plant-derived fuel) to heat a residence and which has a thermal efficiency rating of at least 75%.