As George stated "nice....work"
I read and understand the logical explanations from certain geographical areas.
Yes, a c&p conn would be a safer method to power-up from a gen. And, I guess the HVAC guy could just take the new unit out of the crate & plug it in.
The other devices mentioned by some, are we talking a factory/mfg c&p, or 'installed by EC'??
Replacement furnaces and boilers can legally be 'wired' by the heating contractor, plumber, oil man, or homeowner, as long as a permit is obtained. All are 'hardwired'.
BTW, accessory items? humidifier, electronic air cleaner, condensate pump, how do you cord & plug guys handle them??
John