My wife and I both work from home. For our work at home expenses, under maintenance can we both claim our furnace replacement or only one of us?

Both of us work from home for different employers and can claim in-home office expenses.

We had our furnace replaced last year. I believe we can claim a portion of this, but I am unsure if this can be claimed under each of our returns, or if we have to chose just one of us to claim it under.