I would add that the electrician can be allowed in the home but you do not grant permission for any activity such and opening the electrical box, entering the attic or pulling out that silly polarity checker.
Such activity was completed during the home inspection that the buyer paid for or waived.
I would image the buyer has a vision for the new look of their new home. They are excited and are unaware this action is disturbing your peace. The concern may simply be what approximate cost is invoved to run 220 the support the spa. Choose kindness and don't dampen their enthusiasm.
By the way, congrats on getting your home sold.
Best of success to you,
You may be correct in having questions about this.....is the visit for the purpose of putting together a proposed bid for work to be done in the future or another level of an inspection prior to closing.
In my opinion, it's important to be as cooperative as possible with buyers but shouldn't they be able to wait another 24 hours to be able to accomplish this task on the new owner's calendar?
Where does your agent stand on this?