said by cowboyro:said by assumingmuch :Assuming 1988 = crap is pretty stupid.
The performance of the units degrades with time. A 20 year unit is likely 30% less efficient than when it was built. Studies have found a typical performance drop of 7% after 1 year.
Given that the efficiency of units 25 years ago wasn't that great to start with, a new unit can potentially cut the consumption in half (at least for the first few years).
Yes but once you count in repair or replacement cost because it failed just right after the warranty it's a push.