The suite is new (i.e. the kitchen), but the basement was finished like 10 years ago.
I talked to the permitting guy and he said basically if we want to have a range or whatever then we need to have a development permit to have a legal suite, and that requires the separate heating system.
I did have an HVAC guy over to do a quote, and he said even with in floor heating I would still need a heat exchanger and ducts and stuff. So I'm putting in another furnace, it's the cheapest of the options
I'll get that money back through rent so I guess it's not terrible, and we managed to minimize the amount of drywall we tore down. And I imagine having a legal suite could be a selling feature down the road.