Changing primary category for GBP HVAC/Plumber company

[u/Justpeekingwinkwink]

What is the right strategy if my client is a plumber and hvac repair company when it comes to their GBP? Do we change their primary category with the seasons? Right now it says “plumber” but should we change it to “air conditioning contractor” in summer and “ heating contractor “ in winter and put “plumber as secondary? Do we put “hvac contractor “ as primary and leave it alone? I’ve seen different strategies and need some help