One can vent the hot air from hoods into their home, or consider my method; I pulled the chiller inside for the winter, it sits on a low table in the back bedroom. Air to ventilate my grow enters the house from the window in the same room, keeping the chiller cool. This air flows down the hallway, through the rest of the house and then downstairs to vent my veg and to exit through sealed hoods and exhausted outside.
Using my chiller as my home heating plant allowed me to essentially replace my furnace. I ran it for only 30 minutes last winter, on the last day of a five day cold snap that saw overnight temps below zero F and daytime 'highs' not above 20F. It's the same heat, it's just put in the water and carried out of the grow room, then pumped out of the water and into the air by the chiller itself.