If the water source heat pumps are performing most of the heating, this modification wasn't necessary. If the heat pumps are tied to the ems, and only maintain a minimum building temp over night, you could have reworked the scheduling so that they run over night without it getting too cold. There's more than one way to skin a cat, sir. Think about all of your options before you take such drastic measures next time. I would never bypass a safety and leave a unit running; not even to run to a supply house for parts.