Thirty low-income housing units located in the high altitude San Luis Valley of Colorado received various energy conservation measures (ECM) in the summer of 2007. Measures included new furnaces, new tankless water heaters, programmable thermostats, addition/repair of roof insulation, existing furnace tune-up (where applicable), CFL bulbs and minor air sealing. Measurement and verification of the energy savings consisted of pre- and post-retrofit walk-through audits, blower door testing and temperature monitoring of select units. Verification methods consist of two whole building approach methods in addition to the calibrated simulation approach, following the ASHRAE Guideline 14-2002 protocols. All three methods are shown to produce remarkably similar savings estimates, with whole building approach methods being the simplest and least costly (time-intensive) to utilize for savings verification. The analysis provides insight into the effectiveness of the various methods as well as the impacts of the ECMs on residential energy consumption.