Try that waste LED heat before you go out and buy something. LEDs make almost as much heat as HID bulbs, it’s just spread out in more air. My wife has the grow room waste exhaust running into her office and it makes that the warmest room in the house. Just from 400 watts of COB fixtures. Even if LEDs are a little more efficient than HID, they just put out more light and less waste heat, but almost all of that light gets absorbed and reradiated as heat.
If the LED heat works, check the temperature just before the lights come on. You might need to add heat during lights off. Or just run 24/0 during veg.