Of course you don't have to replace both at the same time - but the efficiency of the new vs. old may make it worth it to. You can sell the other set or donate the other set... even if you don't, and the delivery people remove it, it's either passed along to someone else or recycled.
Gosh, the attitudes towards people who replace with a matched set -
- if you want to and can afford to replace both at the same time - go ahead!
Gosh, the attitudes towards people who replace with a matched set -
- if you want to and can afford to replace both at the same time - go ahead!