I spent a small fortune when I built my new place on HVAC approx 13yrs ago. We installed an ARES tempered makeup air system for the kitchen that uses a gas fired furnace to "heat" the makeup air during winter months and an evaporative cooler to "cool" the makeup air during summer months (most of the year we just vent the outside air to save money when the temps are comfortable). In the dining room we had a local contractor recommend a hydro-air system with air handlers in our drop ceiling and a Peerless boiler that we also use for our hot water. We have upgraded our exhaust fans in recent years and have been having problems with the makeup air unit. Furthermore, I am told that the gas for all 3 condensors for our dining room A/C is soon to be outlawed and cannot get replacement condensors. My buddy told me that this is a HUGE job as all the handlers would have to be replaced as well. I guess my question is if anyone else is in this situation where they re-invested in a new system and any advice they would have to do it right the second time around (split systems, etc.) Not sure at what point it has it gone past it useful life so I am looking for any advice. Thanks!