I'm getting bids on a residential split system replacement with heat. I wanted to qualify for the $1500 tax incentive so he told me it's easier to hit with heating since the 16+ SEER ACs are a bigger investment and given my Northeast location, the 95% AFUE would have a shorter pay off period.
Right now I have both the NG hot water and furnace venting into an all metal chimney (I'm guessing it's 10" diameter). I understand the 95% units use two PVC pipes, one for intake and one for exhaust. But what I thought I read around here is that the larger chimney is no longer appropriate to vent just the water heater. He just said that they'd block off the HVAC entrance in the WYE and it's fine.
The company is 75% NATE certified but I want to be an educated customer for the next couple bids. Thanks for any help.