I don't know what state you are in, however in New York State, the EMS regulations
part 800.22 (g) states:
"(g) have all ambulances built after July 1, 1990, equipped with a heating, ventilation and air conditioning system which maintains the patient compartment at approximately 75 degrees Fahrenheit regardless of outside temperature;"
https://regs.health.ny.gov/content/...ents-certified-ambulance-vehicle-construction
I see temperature control as both a patient safety and crew safety item. Good luck.
part 800.22 (g) states:
"(g) have all ambulances built after July 1, 1990, equipped with a heating, ventilation and air conditioning system which maintains the patient compartment at approximately 75 degrees Fahrenheit regardless of outside temperature;"
https://regs.health.ny.gov/content/...ents-certified-ambulance-vehicle-construction
I see temperature control as both a patient safety and crew safety item. Good luck.