ENERGY STAR-labeled central air conditioner and doors received higher satisfaction ratings compared with the equivalent product without the label (p-value = 0.017 and p-value = 0.073). The satisfaction rating of copying machines was lower for ENERGY STAR-labeled models than for non-ENERGY STAR-labeled models (p- value = 0.001), though that result is significant, it was based on the responses of only two ENERGY STAR-labeled copier purchasers.
Three ENERGY STAR-labeled products showed a statistically significant increase in customer satisfaction between 2008 and 2009. These were insulation (p-value = 0.016), skylights (p-value = 0.012), and central air conditioning (p-value =.040). No ENERGY STAR labeled products showed a decrease in customer satisfaction over the same period.