Should I be present during maintenance if tenant isn't home?

[Wade Penner]

The tenant won't be home during some upcoming maintenance (heater replacement), which could take at least a few hours. It's a trustworthy company doing the installation.  I need to let the installer in, but is it advisable to wait around until they finish since the tenant isn't home?

It seems unrealistic for me to be present during all types of maintenance, but I just wanted to double check.

Thanks!
Wade