I feel like a more appropriate - or at least a more interesting - comparison would be “fix the old one” vs “replace with new.” Replacing an old broken product with a new unbroken one is changing two variables, not one.
Now, if the author would like to break their New refrigerator and report back, I’ll take it as an interesting result.
Now, if the author would like to break their New refrigerator and report back, I’ll take it as an interesting result.